| Common Name | Scientific Name | Code |
| n/a | Acacia abyssinica Hochst. ex Benth. | ACAB2 |
| n/a | Acacia abyssinica Hochst. ex Benth. ssp. calophylla Brenan | ACABC2 |
| n/a | Acacia aciphylla Benth. | ACAC8 |
| n/a | Acacia aculeatissima J. F. Macbr. | ACAC9 |
| n/a | Acacia acuminata Benth. | ACAC10 |
| n/a | Acacia arenaria Schinz | ACAR12 |
| n/a | Acacia buxifolia A. Cunn. | ACBU3 |
| n/a | Acacia caesiella Maiden & Blakely | ACCA23 |
| n/a | Acacia colletioides A. Cunn. ex Benth. | ACCO16 |
| n/a | Acacia conspersa F. Muell. | ACCO17 |
| n/a | Acacia craspedocarpa F. Muell. | ACCR2 |
| n/a | Acacia cupularis Domin | ACCU5 |
| n/a | Acacia davyi N. E. Br. | ACDA5 |
| n/a | Acacia deanei (R. T. Baker) M. B. Welch et al. ssp. paucijuga (Wakef.) Tindale | ACDEP2 |
| n/a | Acacia dietrichiana F. Muell. | ACDI7 |
| n/a | Acacia dunnii Turrill | ACDU3 |
| n/a | Acacia eburnea (L. f.) Willd. | ACEB2 |
| n/a | Acacia erubescens Welw. ex Oliv. | ACER5 |
| n/a | Acacia estrophiolata F. Muell. | ACES2 |
| n/a | Acacia extensa Lindl. | ACEX3 |
| n/a | Acacia floribunda (Vent.) Willd. | ACFL6 |
| n/a | Acacia galpinii Burtt Davy | ACGA3 |
| n/a | Acacia gerrardii Benth. | ACGE7 |
| n/a | Acacia gladiiformis A. Cunn. ex Benth. | ACGL5 |
| n/a | Acacia glandulicarpa Reader | ACGL6 |
| n/a | Acacia goetzei Harms | ACGO2 |
| n/a | Acacia hakeoides A. Cunn. ex Benth. | ACHA4 |
| n/a | Acacia hebeclada DC. | ACHE8 |
| n/a | Acacia hemiteles Benth. | ACHE12 |
| n/a | Acacia horrida (L.) Willd. | ACHO4 |
| n/a | Acacia iteaphylla F. Muell. ex Benth. | ACIT2 |
| n/a | Acacia ixiophylla Benth. | ACIX2 |
| n/a | Acacia jibberdingensis Maiden & Blakely | ACJI |
| n/a | Acacia jonesii F. Muell. & Maiden | ACJO2 |
| n/a | Acacia lanuginophylla R. S. Cowan & Maslin | ACLA10 |
| n/a | Acacia lasiocalyx C. R. P. Andrews | ACLA6 |
| n/a | Acacia leiophylla Benth. | ACLE7 |
| n/a | Acacia lineata A. Cunn. ex G. Don | ACLI5 |
| n/a | Acacia longifolia (Andr.) Willd. ssp. sophorae (Labill.) Court | ACLOS3 |
| n/a | Acacia longissima H. L. Wendl. | ACLO8 |
| n/a | Acacia maidenii F. Muell. | ACMA11 |
| n/a | Acacia mangium Willd. | ACMA12 |
| n/a | Acacia mellifera (Vahl) Benth. | ACME8 |
| n/a | Acacia mellifera (Vahl) Benth. ssp. detinens (Burch.) Brenan | ACMED |
| n/a | Acacia merrallii F. Muell. | ACME6 |
| n/a | Acacia microbotrya Benth. | ACMI5 |
| n/a | Acacia montana Benth. | ACMO9 |
| n/a | Acacia multispicata Benth. | ACMU7 |
| n/a | Acacia myrtifolia (Sm.) Willd. | ACMY2 |
| n/a | Acacia neriifolia A. Cunn. ex Benth. | ACNE8 |
| n/a | Acacia nilotica (L.) Willd. ex Delile ssp. adstringens (Schumach. & Thonn.) Roberty | ACNIA3 |
| n/a | Acacia nilotica (L.) Willd. ex Delile ssp. kraussiana (Benth.) Brenan | ACNIK2 |
| n/a | Acacia oxycedrus Sieber ex DC. | ACOX3 |
| n/a | Acacia pachyceras Sw. | ACPA15 |
| n/a | Acacia pachyceras Sw. var. najdensis (Chaudhary) Boulos | ACPAN |
| n/a | Acacia papyrocarpa Benth. | ACPA16 |
| n/a | Acacia pentagona (Schumach. & Thonn.) Hook. f. | ACPE11 |
| n/a | Acacia polyacantha Willd. ssp. campylacantha (Hochst. ex A. Rich.) Brenan | ACPOC2 |
| n/a | Acacia pulchella R. Br. | ACPU3 |
| n/a | Acacia pyrifolia DC. | ACPY4 |
| n/a | Acacia ramulosa W. Fitzg. | ACRA5 |
| n/a | Acacia richii Gray [excluded] | ACRI10 |
| n/a | Acacia robusta Burch. | ACRO5 |
| n/a | Acacia rossei F. Muell. | ACRO6 |
| n/a | Acacia rupicola F. Muell. ex Benth. | ACRU12 |
| n/a | Acacia saliciformis Tindale | ACSA9 |
| n/a | Acacia schweinfurthii Brenan & Exell | ACSC9 |
| n/a | Acacia scleroxyla Tussac [excluded] | ACSC12 |
| n/a | Acacia senegal (L.) Willd. var. rostrata Brenan | ACSER2 |
| n/a | Acacia sieberiana DC. | ACSI7 |
| n/a | Acacia stricta (Andrews) Willd. | ACST6 |
| n/a | Acacia sublanata Benth. | ACSU11 |
| n/a | Acacia swazica Burtt Davy | ACSW2 |
| n/a | Acacia terminalis (Salisb.) J.F. Macbr. [excluded] | ACTE9 |
| n/a | Acacia tortilis (Forsskal) Hayne ssp. heteracantha (Burch.) Brenan | ACTOH2 |
| n/a | Acacia tortilis (Forsskal) Hayne ssp. spirocarpa (Hochst. ex A. Rich.) Brenan | ACTOS2 |
| n/a | Acacia trineura F. Muell. | ACTR6 |
| n/a | Acacia uncinata Lindl. | ACUN2 |
| n/a | Acacia undulifolia G. Lodd. | ACUN3 |
| n/a | Acacia urophylla Benth. ex Lindl. | ACUR2 |
| n/a | Acacia verniciflua A. Cunn. | ACVE5 |
| n/a | Acacia viscidula Benth. | ACVI9 |
| n/a | Acacia visco Lorentz ex Griseb. | ACVI10 |
| n/a | Acacia wattsiana F. Muell. ex Benth. | ACWA3 |
| n/a | Acacia willardiana Rose | ACWI2 |
| n/a | Adenocarpus DC. | ADENO6 |
| n/a | Adesmia DC. | ADESM |
| n/a | Adesmia filifolia Clos | ADFI2 |
| n/a | Adesmia incana Vogel | ADIN2 |
| n/a | Adesmia muricata (Jacq.) DC. | ADMU2 |
| n/a | Adesmia tenella Hook. & Arn. | ADTE3 |
| n/a | Aeschynomene brasiliana (Poir.) DC. | AEBR2 |
| n/a | Aeschynomene elegans Schltdl. & Cham. | AEEL3 |
| n/a | Albizia amara (Roxb.) Boivin | ALAM12 |
| n/a | Albizia antunesiana Harms | ALAN6 |
| n/a | Albizia gummifera (J. F. Gmel.) C. A. Sm. | ALGU |
| n/a | Albizia kalkora (Roxb.) Prain | ALKA2 |
| n/a | Albizia schimperiana Oliv. | ALSC11 |
| n/a | Alysicarpus glumaceus (Vahl) DC. | ALGL15 |
| n/a | Amorpha ?notha Palmer [canescens ? fruticosa] | AMNO |
| n/a | Anthyllis cornicina L. | ANCO36 |
| n/a | Anthyllis lotoides L. | ANLO6 |
| n/a | Anthyllis vulneraria L. ssp. maritima (Schweigg.) Corb. | ANVUM |
| n/a | Anthyllis vulneraria L. ssp. polyphylla (DC.) Nyman | ANVUP |
| n/a | Antopetitia A. Rich. | ANTOP |
| n/a | Antopetitia abyssinica A. Rich. | ANAB2 |
| n/a | Arachis benthamii Handro | ARBE6 |
| n/a | Arachis burkartii Handro | ARBU5 |
| n/a | Arachis paraguariensis Chodat & Hassl. | ARPA33 |
| n/a | Arachis pusilla Benth. | ARPU20 |
| n/a | Arachis rigonii Krapov. & W. C. Greg. | ARRI8 |
| n/a | Arachis villosa Benth. | ARVI17 |
| n/a | Argyrolobium arabicum (Decne.) Jaub. & Spach | ARAR30 |
| n/a | Argyrolobium Eckl. & Zeyh., nom. cons. | ARGYR6 |
| n/a | Argyrolobium marginatum Bolus | ARMA30 |
| n/a | Argyrolobium rupestre (E. Mey.) Walp. | ARRU13 |
| n/a | Argyrolobium rupestre (E. Mey.) Walp. ssp. remotum (A. Rich.) Polhill | ARRUR2 |
| n/a | Argyrolobium uniflorum (Decne.) Jaub. & Spach | ARUN5 |
| n/a | Argyrolobium zanonii (Turra) P. W. Ball | ARZA2 |
| n/a | Aspalathus quinquefolia L. | ASQU4 |
| n/a | Aspalathus quinquefolia L. ssp. virgata (Thunb.) R. Dahlgren | ASQUV |
| n/a | Astragalus aduncus Willd. | ASAD10 |
| n/a | Astragalus alopecuroides L. | ASAL21 |
| n/a | Astragalus alopecurus Pall. | ASAL22 |
| n/a | Astragalus anemophilus Greene [excluded] | ASAN19 |
| n/a | Astragalus angustifolius Lam. | ASAN16 |
| n/a | Astragalus annularis Forssk. | ASAN17 |
| n/a | Astragalus arenarius L. | ASAR15 |
| n/a | Astragalus asper Jacq. | ASAS9 |
| n/a | Astragalus atropilosulus (Hochst.) Bunge | ASAT6 |
| n/a | Astragalus atropilosulus (Hochst.) Bunge ssp. abyssinicus (Hochst.) J. B. Gillett | ASATA2 |
| n/a | Astragalus austriacus Jacq. | ASAU7 |
| n/a | Astragalus boeticus L. | ASBO10 |
| n/a | Astragalus bourgaeanus Coss. | ASBO11 |
| n/a | Astragalus brachycarpus M. Bieb. | ASBR18 |
| n/a | Astragalus bryogenes Barneby [excluded] | ASBR21 |
| n/a | Astragalus bungeanus Boiss. | ASBU2 |
| n/a | Astragalus calycinus M. Bieb. | ASCA43 |
| n/a | Astragalus campylorrhynchus Fisch. & C. A. Mey. | ASCA44 |
| n/a | Astragalus captiosus Boriss. | ASCA49 |
| n/a | Astragalus caraganae Fisch. & C. A. Mey. | ASCA45 |
| n/a | Astragalus carminis Barneby [excluded] | ASCA50 |
| n/a | Astragalus centralpinus Braun-Blanq. | ASCE3 |
| n/a | Astragalus chaborasicus Boiss. & Hausskn. | ASCH14 |
| n/a | Astragalus coluteocarpus Boiss. | ASCO49 |
| n/a | Astragalus commixtus Bunge | ASCO50 |
| n/a | Astragalus coodei D. F. Chamb. & V. A. Matthews | ASCO51 |
| n/a | Astragalus cornutus Pall. | ASCO52 |
| n/a | Astragalus corrugatus Bertol. | ASCO53 |
| n/a | Astragalus cymbicarpos Brot. | ASCY3 |
| n/a | Astragalus danicus Retz. | ASDA5 |
| n/a | Astragalus dasyanthus Pall. | ASDA6 |
| n/a | Astragalus demetrii Kharadze | ASDE21 |
| n/a | Astragalus depressus L. | ASDE22 |
| n/a | Astragalus echinatus Murray | ASEC2 |
| n/a | Astragalus epiglottis L. | ASEP2 |
| n/a | Astragalus fraxinifolius DC. | ASFR10 |
| n/a | Astragalus galegiformis L. | ASGA10 |
| n/a | Astragalus glaux L. | ASGL13 |
| n/a | Astragalus globiceps Bunge | ASGL14 |
| n/a | Astragalus glycyphylloides DC. | ASGL15 |
| n/a | Astragalus incanus L. | ASIN29 |
| n/a | Astragalus incanus L. ssp. macrorhizus (Cav.) Chater | ASINM |
| n/a | Astragalus inflatus DC. | ASIN20 |
| n/a | Astragalus lasioglottis Steven ex M. Bieb. | ASLA21 |
| n/a | Astragalus lentiginosus Dougl. ex Hook. var. trumbullensis Welsh & Atwood | ASLET4 |
| n/a | Astragalus lurorum Bornm. | ASLU7 |
| n/a | Astragalus magdalenae Greene var. niveus (Rydb.) Barneby [excluded] | ASMAN2 |
| n/a | Astragalus melilotoides Pall. | ASME13 |
| n/a | Astragalus mongholicus Bunge | ASMO18 |
| n/a | Astragalus monspessulanus L. | ASMO19 |
| n/a | Astragalus norvegicus Weber | ASNO8 |
| n/a | Astragalus onobrychis L. | ASON3 |
| n/a | Astragalus pallescens M. Bieb. | ASPA36 |
| n/a | Astragalus penduliflorus Lam. | ASPE18 |
| n/a | Astragalus polybotrys Boiss. | ASPO14 |
| n/a | Astragalus ponticus Pall. | ASPO11 |
| n/a | Astragalus sabulosus M.E. Jones var. vehiculus Welsh | ASSAV |
| n/a | Astragalus scorpioides Pourr. ex Willd. | ASSC15 |
| n/a | Astragalus scorpiurus Bunge | ASSC16 |
| n/a | Astragalus sesameus L. | ASSE20 |
| n/a | Astragalus siliquosus Boiss. | ASSI12 |
| n/a | Astragalus stella Gouan | ASST20 |
| n/a | Astragalus stevenianus DC. | ASST21 |
| n/a | Astragalus subumbellatus Klotzsch | ASSU28 |
| n/a | Astragalus sulcatus L. | ASSU29 |
| n/a | Astragalus suprapilosus Gontsch. | ASSU30 |
| n/a | Astragalus tephrosioides Boiss. | ASTE21 |
| n/a | Astragalus trimestris L. | ASTR17 |
| n/a | Astragalus utriger Pall. | ASUT3 |
| n/a | Astragalus vaginatus Pall. | ASVA8 |
| n/a | Astragalus verus Olivier | ASVE16 |
| n/a | Astragalus vesicarius L. | ASVE17 |
| n/a | Baptisia ?bicolor Greenm. & Larisey [australis ? bracteata] | BABI4 |
| n/a | Baptisia ?bushii Small (pro sp.) [bracteata ? sphaerocarpa] | BABU |
| n/a | Baptisia ?fulva Larisey [alba ? perfoliata] | BAFU |
| n/a | Baptisia ?microphylla Nutt. (pro sp.) [perfoliata ? tinctoria] | BAMI3 |
| n/a | Baptisia ?serenae M.A. Curtis (pro sp.) [albescens ? tinctoria] | BASE3 |
| n/a | Baptisia ?sulphurea Engelm. (pro sp.) [alba ? sphaerocarpa] | BASU |
| n/a | Baptisia ?variicolor M. Kosnik, G. Diggs, P. Redshaw & B. Lipscomb [australis ? sphaerocarpa] | BAVA5 |
| n/a | Bauhinia ?blakeana S.T. Dunn [purpurea ? variegata] | BABL |
| n/a | Bauhinia aculeata L. | BAAC6 |
| n/a | Bauhinia diphylla Buch.-Ham. | BADI5 |
| n/a | Bauhinia divaricata L. [excluded] | BADI9 |
| n/a | Bauhinia macrantha Benth. ex Hemsl. [excluded] | BAMA16 |
| n/a | Bauhinia petersiana Bolle | BAPE8 |
| n/a | Bauhinia ungulata L. [excluded] | BAUN9 |
| n/a | Biserrula L. | BISER |
| n/a | Biserrula pelecinus L. | BIPE3 |
| n/a | Bossiaea buxifolia A. Cunn. | BOBU2 |
| n/a | Bossiaea foliosa A. Cunn. | BOFO2 |
| n/a | Bossiaea Vent. | BOSSI |
| n/a | Caesalpinia myabensis Britton | CAMY2 |
| n/a | Caesalpinia peninsularis (Britt.) Eifert [excluded] | CAPE46 |
| n/a | Caesalpinia pumila (Britton & Rose) F. J. Herm. | CAPU42 |
| n/a | Cajanus goensis Dalzell | CAGO4 |
| n/a | Cajanus marmoratus (R. Br. ex Benth.) F. Muell. | CAMA59 |
| n/a | Calliandra caracasana Jacq. [excluded] | CACA100 |
| n/a | Calophaca Fisch. | CALOP8 |
| n/a | Calophaca wolgarica (L. f.) Fisch. ex DC. | CAWO6 |
| n/a | Calopogonium galactioides (Kunth) Benth. ex Hemsl. | CAGA8 |
| n/a | Canavalia campylocarpa Piper [excluded] | CACA103 |
| n/a | Canavalia megalantha Merr. | CAME39 |
| n/a | Canavalia megalantha Merr. var. megalantha | CAMEM2 |
| n/a | Caragana ?sophorifolia Tausch | CASO9 |
| n/a | Caragana brevispina Royle ex Benth. | CABR40 |
| n/a | Caragana camilli-schneideri Kom. | CACA89 |
| n/a | Caragana decorticans Hemsl. | CADE30 |
| n/a | Caragana erinacea Kom. | CAER10 |
| n/a | Caragana grandiflora DC. | CAGR37 |
| n/a | Caragana manshurica (Kom.) Kom. | CAMA60 |
| n/a | Caragana pygmaea (L.) DC. | CAPY10 |
| n/a | Caragana zahlbruckneri C. K. Schneid. | CAZA3 |
| n/a | Caragana zahlbruckneri C. K. Schneid. var. pekinensis Yakovlev | CAZAP |
| n/a | Carmichaelia williamsi Kirk | CAWI11 |
| n/a | Cassia abbreviata Oliv. ssp. beareana (Holmes) Brenan | CAABB2 |
| n/a | Cassia australis Sims | CAAU22 |
| n/a | Cassia leptophylla Vogel | CALE49 |
| n/a | Centrosema arenarium Benth. | CEAR10 |
| n/a | Centrosema macrocarpum Benth. | CEMA18 |
| n/a | Chamaecrista desvauxii (Collad.) Killip | CHDE20 |
| n/a | Chamaecrista desvauxii (Collad.) Killip var. latistipula (Benth.) G. P. Lewis | CHDEL3 |
| n/a | Chamaecrista dimidiata (Buch.-Ham. ex Roxb.) Lock | CHDI10 |
| n/a | Chamaecrista nictitans (L.) Moench ssp. nictitans var. jaliscensis (Greenm.) Irwin & Barneby [excluded] | CHNIJ2 |
| n/a | Chamaecrista ramosa (Vogel) Irwin & Barneby [excluded] | CHRA9 |
| n/a | Chamaecytisus glaber (L. f.) Rothm. | CHGL14 |
| n/a | Chamaecytisus hirsutus (L.) Link | CHHI13 |
| n/a | Chamaecytisus mollis (Cav.) Greuter & Burdet | CHMO13 |
| n/a | Chamaecytisus ratisbonensis (Schaeff.) Rothm. | CHRA8 |
| n/a | Chapmannia prismatica (Sesse & Moc.) Thulin | CHPR13 |
| n/a | Colophospermum Kirk ex J. L?onard | COLOP |
| n/a | Colutea ?media Willd. | COME12 |
| n/a | Colutea arborescens L. | COARB |
| n/a | Coronilla coronata L. | COCO33 |
| n/a | Coronilla juncea L. | COJU3 |
| n/a | Coronilla minima L. | COMI12 |
| n/a | Coronilla minima L. ssp. lotoides (W. D. J. Koch) Nyman | COMIL |
| n/a | Coronilla repanda (Poir.) Guss. | CORE12 |
| n/a | Coronilla vaginalis Lam. | COVA6 |
| n/a | Coronilla valentina L. ssp. glauca (L.) Batt. | COVAG2 |
| n/a | Crotalaria argyrolobioides Baker | CRAR15 |
| n/a | Crotalaria atrorubens Hochst. ex Benth. | CRAT5 |
| n/a | Crotalaria capensis Jacq. | CRCA27 |
| n/a | Crotalaria cleomifolia Welw. ex Baker | CRCL3 |
| n/a | Crotalaria eremaea F. Muell. | CRER6 |
| n/a | Crotalaria ferruginea Graham ex Benth. | CRFE9 |
| n/a | Crotalaria filipes Benth. | CRFI5 |
| n/a | Crotalaria grahamiana Wight & Arn. | CRGR18 |
| n/a | Crotalaria hebecarpa (DC.) Rudd | CRHE6 |
| n/a | Crotalaria impressa Nees ex Walp. | CRIM8 |
| n/a | Crotalaria laburnifolia L. | CRLA17 |
| n/a | Crotalaria laburnifolia L. ssp. australis (Baker f.) Polhill | CRLAA2 |
| n/a | Crotalaria laburnoides Klotzsch | CRLA18 |
| n/a | Crotalaria lachnophora Hochst. ex A. Rich. | CRLA16 |
| n/a | Crotalaria lanceolata E. Mey. ssp. prognatha Polhill | CRLAP2 |
| n/a | Crotalaria medicaginea Lam. | CRME13 |
| n/a | Crotalaria nitens Kunth | CRNI6 |
| n/a | Crotalaria orixensis Rottler ex Willd. | CROR3 |
| n/a | Crotalaria pilosa P. Mill. [excluded] | CRPI81 |
| n/a | Crotalaria quinquefolia L. | CRQU2 |
| n/a | Crotalaria rogersii Baker f. | CRRO14 |
| n/a | Crotalaria senegalensis (Pers.) Bacle ex DC. | CRSE12 |
| n/a | Crotalaria sphaerocarpa Perr. ex DC. | CRSP9 |
| n/a | Crotalaria trifoliastrum Willd. | CRTR11 |
| n/a | Crotalaria vallicola Baker f. | CRVA5 |
| n/a | Crudia cynometroides Hosokawa | CRCY |
| n/a | Crudia Schreb. | CRUDI |
| n/a | Cullen cinereum (Lindl.) J. W. Grimes | CUCI2 |
| n/a | Cullen graveolens (Domin) J. W. Grimes | CUGR3 |
| n/a | Cullen tenax (Lindl.) J. W. Grimes | CUTE2 |
| n/a | Cytisophyllum Lang | CYTIS2 |
| n/a | Cytisophyllum sessilifolius (L.) Lang | CYSE13 |
| n/a | Cytisus ?dallimorei Rolfe [multiflorus ? scoparius] | CYDA2 |
| n/a | Cytisus ?kewensis Bean | CYKE3 |
| n/a | Cytisus commutatus (Willk.) Briq. | CYCO19 |
| n/a | Cytisus decumbens (Durande) Spach | CYDE8 |
| n/a | Cytisus nigricans L. | CYNI6 |
| n/a | Dalea cliffortiana Willd. [excluded] | DACL |
| n/a | Dalea mexiae Barneby [excluded] | DAME6 |
| n/a | Dalea versicolor Zucc. var. glabrescens (Rydb.) Barneby [excluded] | DAVEG2 |
| n/a | Dalea virgata Lag. | DAVI5 |
| n/a | Dendrolobium (Wight & Arn.) Benth. | DENDR14 |
| n/a | Dendrolobium lanceolatum (Dunn) Schindl. | DELA12 |
| n/a | Desmodium angustifolium (Kunth) DC. [excluded] | DEAN7 |
| n/a | Desmodium aparines (Link) DC. | DEAP3 |
| n/a | Desmodium campylocaulon F. Muell. ex Benth. | DECA19 |
| n/a | Desmodium cinereum (Kunth) DC. | DECI6 |
| n/a | Desmodium cuneatum Hook. & Arn. | DECU3 |
| n/a | Desmodium distortum (Aubl.) J. F. Macbr. | DEDI10 |
| n/a | Desmodium elegans DC. | DEEL6 |
| n/a | Desmodium gangeticum (L.) DC. | DEGA2 |
| n/a | Desmodium hassleri (Schindl.) Burkart | DEHA4 |
| n/a | Desmodium hirtum Guill. & Perr. | DEHI2 |
| n/a | Desmodium leiocarpon (Spreng.) G. Don | DELE5 |
| n/a | Desmodium nicaraguense Oerst. | DENI2 |
| n/a | Desmodium pabulare Hoehne | DEPA15 |
| n/a | Desmodium podocarpum DC. | DEPO5 |
| n/a | Desmodium podocarpum DC. ssp. oxyphyllum (DC.) H. Ohashi | DEPOO |
| n/a | Desmodium salicifolium (Poir.) DC. | DESA3 |
| n/a | Desmodium umbellatum (L.) DC. | DEUM4 |
| n/a | Desmodium varians (Labill.) G. Don | DEVA3 |
| n/a | Dillwynia retorta (J. C. Wendl.) Druce | DIRE16 |
| n/a | Dillwynia Sm. | DILLW |
| n/a | Dioclea bicolor Benth. | DIBI7 |
| n/a | Dioclea megacarpa Rolfe | DIME7 |
| n/a | Dolichos L., nom. cons. | DOLIC2 |
| n/a | Dolichos sericeus E. Mey. | DOSE3 |
| n/a | Dolichos sericeus E. Mey. ssp. formosus (Hochst. ex A. Rich.) Verdc. | DOSEF |
| n/a | Dolichos trilobus L. | DOTR2 |
| n/a | Dorycnium Mill. | DORYC |
| n/a | Dorycnium pentaphyllum Scop. ssp. germanicum (Gremli) Gams | DOPEG |
| n/a | Dorycnium pentaphyllum Scop. ssp. herbaceum (Vill.) Rouy | DOPEH |
| n/a | Dorycnium rectum (L.) Ser. | DORE4 |
| n/a | Ebenopsis confinis (Standl.) Britton & Rose | EBCO |
| n/a | Ebenus L. | EBENU |
| n/a | Ebenus stellata Boiss. | EBST |
| n/a | Entada pursaetha DC. | ENPU3 |
| n/a | Eriosema floribundum Benth. | ERFL16 |
| n/a | Eriosema jurionianum Staner & De Craene | ERJU2 |
| n/a | Eriosema parviflorum E. Mey. | ERPA28 |
| n/a | Galactia acapulcensis Rose | GAAC3 |
| n/a | Galactia jussiaeana Kunth | GAJU2 |
| n/a | Galega lindblomii (Harms) J. B. Gillett | GALI6 |
| n/a | Genista tridentata L. | GETR4 |
| n/a | Geoffroea Jacq. | GEOFF |
| n/a | Gleditsia ?texana Sarg. (pro sp.) [aquatica ? triacanthos] | GLTE |
| n/a | Gleditsia japonica Miq. | GLJA4 |
| n/a | Gleditsia japonica Miq. var. japonica | GLJAJ |
| n/a | Gleditsia sinensis Lam. | GLSI2 |
| n/a | Glycine clandestina H. Wendl. | GLCL2 |
| n/a | Glycine falcata Benth. | GLFA3 |
| n/a | Guibourtia Benth. | GUIBO |
| n/a | Hardenbergia Benth. | HARDE |
| n/a | Havardia mexicana (Rose) Britton & Rose | HAME3 |
| n/a | Havardia sonorae (S. Watson) Britton & Rose | HASO |
| n/a | Hebestigma cubense (Kunth) Urban var. cubense | HECUC3 |
| n/a | Hebestigma Urban | HEBES |
| n/a | Hedysarum arcticum B. Fedtsch. | HEAR17 |
| n/a | Hedysarum biebersteinii Chrtkova | HEBI7 |
| n/a | Hedysarum candidum M. Bieb. | HECA32 |
| n/a | Hedysarum cyprium Boiss. | HECY3 |
| n/a | Hedysarum flexuosum L. | HEFL15 |
| n/a | Hedysarum fruticosum Pall. | HEFR3 |
| n/a | Hedysarum humile L. | HEHU2 |
| n/a | Hedysarum multijugum Maxim. | HEMU4 |
| n/a | Hedysarum spinosissimum L. | HESP10 |
| n/a | Hedysarum tauricum Pall. ex Willd. | HETA2 |
| n/a | Hedysarum varium Willd. | HEVA2 |
| n/a | Hedysarum vicioides Turcz. | HEVI11 |
| n/a | Hippocrepis bicontorta Loisel. | HIBI3 |
| n/a | Hippocrepis emerus (L.) Lassen | HIEM |
| n/a | Hippocrepis emerus (L.) Lassen ssp. emeroides (Boiss. & Spruner) Greuter & Burdet ex Lassen | HIEME |
| n/a | Hippocrepis glauca Ten. | HIGL2 |
| n/a | Hippocrepis multisiliquosa L. | HIMU6 |
| n/a | Hippocrepis salzmannii Boiss. & Reut. | HISA5 |
| n/a | Hippocrepis scabra DC. | HISC9 |
| n/a | Hippocrepis unisiliquosa L. | HIUN3 |
| n/a | Hymenocarpos circinnatus (L.) Savi | HYCI5 |
| n/a | Hymenocarpos Savi | HYMEN12 |
| n/a | Indigofera amblyantha Craib | INAM2 |
| n/a | Indigofera atriceps Hook. f. | INAT |
| n/a | Indigofera atriceps Hook. f. ssp. ramosa (Cronquist) J. B. Gillett | INATR |
| n/a | Indigofera circinella Baker f. | INCI2 |
| n/a | Indigofera cordifolia B. Heyne ex Roth | INCO3 |
| n/a | Indigofera cryptantha Benth. ex Harv. | INCR2 |
| n/a | Indigofera dosua Buch.-Ham. ex D. Don | INDO2 |
| n/a | Indigofera flavicans Baker | INFL2 |
| n/a | Indigofera glandulosa J. C. Wendl. | INGL2 |
| n/a | Indigofera hochstetteri Baker | INHO2 |
| n/a | Indigofera kirilowii Maxim. ex Palib. var. coreana Craib | INKIC2 |
| n/a | Indigofera nummulariifolia (L.) Livera ex Alston | INNU |
| n/a | Indigofera parodiana Burkart | INPA2 |
| n/a | Indigofera praticola Baker f. | INPR2 |
| n/a | Indigofera pretoriana Harms | INPR3 |
| n/a | Indigofera pseudotinctoria Matsum. | INPS2 |
| n/a | Indigofera rautanenii Baker f. | INRA3 |
| n/a | Indigofera schimperi Jaub. & Spach | INSC2 |
| n/a | Indigofera schinzii N. E. Br. | INSC3 |
| n/a | Indigofera sessilifolia DC. | INSE |
| n/a | Inga fastulosa (Jacq.) Willd. [excluded] | INFA4 |
| n/a | Inocarpus fagifer (Parkinson) F.R. Fosberg | INFA3 |
| n/a | Inocarpus J.R. & G. Forst. | INOCA |
| n/a | Intsia (Colebr.) Kuntze | INBI |
| n/a | Intsia Thouars | INTSI |
| n/a | Kennedia rubicunda (Schneev.) Vent. | KERU2 |
| n/a | Kennedia Vent. | KENNE |
| n/a | Laburnum ?watereri (Kirchn.) Dippel [alpinum ? anagyroides] | LAWA7 |
| n/a | Lathyrus alpestris (Waldst. & Kit.) Kit. | LAAL9 |
| n/a | Lathyrus chloranthus Boiss. | LACH7 |
| n/a | Lathyrus filiformis (Lam.) J. Gay | LAFI2 |
| n/a | Lathyrus gorgoni Parl. | LAGO2 |
| n/a | Lathyrus hygrophilus Taub. | LAHY3 |
| n/a | Lathyrus japonicus Willd. var. acutifolius (Bab.) Bassler | LAJAA2 |
| n/a | Lathyrus latifolius L. | LALAA4 |
| n/a | Lathyrus latifolius L. | LALAL4 |
| n/a | Lathyrus linifolius (Reichard) Bassler | LALI6 |
| n/a | Lathyrus magellanicus Lam. | LAMA14 |
| n/a | Lathyrus niger (L.) Bernh. | LANI4 |
| n/a | Lathyrus parviflorus S. Wats. [excluded] | LAPA17 |
| n/a | Lathyrus pseudocicera Pamp. | LAPS |
| n/a | Lathyrus pubescens Hook. & Arn. | LAPU11 |
| n/a | Lathyrus roseus Steven | LARO2 |
| n/a | Lathyrus szowitsii Boiss. | LASZ2 |
| n/a | Lathyrus venetus (Mill.) Wohlf. | LAVE6 |
| n/a | Lebeckia multiflora E. Mey. | LEMU12 |
| n/a | Lebeckia Thunb. | LEBEC2 |
| n/a | Lespedeza ?acuticarpa Mackenzie & Bush (pro sp.) [violacea ? virginica] | LEAC |
| n/a | Lespedeza ?angustifolioides T. B. Lee | LEAN17 |
| n/a | Lespedeza ?brittonii Bickn. (pro sp.) [procumbens ? virginica] | LEBR2 |
| n/a | Lespedeza ?divaricata (Nakai) T. B. Lee | LEDI24 |
| n/a | Lespedeza ?intermixta Makino | LEIN25 |
| n/a | Lespedeza ?longifolia DC. (pro sp.) [capitata ? hirta] | LELO |
| n/a | Lespedeza ?manniana Mackenzie & Bush (pro sp.) [capitata ? violacea] | LEMA6 |
| n/a | Lespedeza ?neglecta Mackenzie & Bush (pro sp.) [stuevei ? virginica] | LENE8 |
| n/a | Lespedeza ?nuttallii Darl. (pro sp.) [hirta ? violacea] | LENU |
| n/a | Lespedeza ?oblongifolia (Britt.) W. Stone [angustifolia ? hirta] | LEOB3 |
| n/a | Lespedeza ?patentibicolor T. B. Lee | LEPA38 |
| n/a | Lespedeza ?simulata Mackenzie & Bush (pro sp.) [capitata ? virginica] | LESI2 |
| n/a | Lespedeza japonica L. H. Bailey | LEJA3 |
| n/a | Lespedeza maximowiczii C. K. Schneid. | LEMA21 |
| n/a | Lespedeza pilosa (Thunb.) Siebold & Zucc. | LEPI12 |
| n/a | Lespedeza tomentosa (Thunb.) Siebold ex Maxim. | LETO9 |
| n/a | Lessertia DC. | LESSE |
| n/a | Lessertia microphylla (Burch. ex DC.) Goldblatt & J. C. Manning | LEMI28 |
| n/a | Leucaena greggii S. Wats. [excluded] | LEGR24 |
| n/a | Leucaena insularum (Guillemin) Daniker | LEIN31 |
| n/a | Leucaena insularum (Guillemin) Daniker var. guamensis Fosberg & Stone | LEING2 |
| n/a | Leucaena leucocephala (Lam.) de Wit ssp. glabrata (Rose) S. Z?rate | LELEG |
| n/a | Lonchocarpus nitidus (Vogel) Benth. | LONI4 |
| n/a | Lotononis angolensis Welw. ex Baker | LOAN5 |
| n/a | Lotononis azurea (Eckl. & Zeyh.) Benth. | LOAZ |
| n/a | Lotononis listii Polhill | LOLI2 |
| n/a | Lotus alpinus (Ser.) Schleich. ex Ramond | LOAL9 |
| n/a | Lotus arabicus L. | LOAR8 |
| n/a | Lotus arenarius Brot. | LOAR9 |
| n/a | Lotus chihuahuanus (S. Watson) Greene | LOCH3 |
| n/a | Lotus collinus (Boiss.) Heldr. | LOCO11 |
| n/a | Lotus conimbricensis Brot. | LOCO13 |
| n/a | Lotus conjugatus L. | LOCO14 |
| n/a | Lotus conjugatus L. ssp. requienii (Mauri ex Sanguin.) Greuter | LOCOR2 |
| n/a | Lotus corniculatus L. ssp. frondosus Freyn | LOCOF |
| n/a | Lotus corniculatus L. var. carnosus Hartm. | LOCOC3 |
| n/a | Lotus corniculatus L. var. hirsutus W. D. J. Koch | LOCOH2 |
| n/a | Lotus cytisoides L. | LOCY3 |
| n/a | Lotus discolor E. Mey. | LODI4 |
| n/a | Lotus edulis L. | LOED3 |
| n/a | Lotus gebelia Vent. | LOGE5 |
| n/a | Lotus glareosus Boiss. & Reut. | LOGL8 |
| n/a | Lotus glaucus Aiton | LOGL7 |
| n/a | Lotus glinoides Delile | LOGL9 |
| n/a | Lotus halophilus Boiss. & Spruner | LOHA6 |
| n/a | Lotus hillebrandii H. Christ | LOHI6 |
| n/a | Lotus lancerottensis Webb & Berthel. | LOLA7 |
| n/a | Lotus macrotrichus Boiss. | LOMA15 |
| n/a | Lotus maritimus L. | LOMA16 |
| n/a | Lotus maroccanus Ball | LOMA12 |
| n/a | Lotus ornithopodioides L. | LOOR6 |
| n/a | Lotus palaestinus (Boiss. & Blanche) Blatt. | LOPA7 |
| n/a | Lotus palustris Willd. | LOPA4 |
| n/a | Lotus peregrinus L. | LOPE8 |
| n/a | Lotus peregrinus L. var. carmeli (Boiss.) Post | LOPEC2 |
| n/a | Lotus preslii Ten. | LOPR5 |
| n/a | Lotus purpureus Webb | LOPU7 |
| n/a | Lotus sessilifolius DC. | LOSE5 |
| n/a | Lotus strictus Fisch. & C. A. Mey. | LOST7 |
| n/a | Lotus weilleri Maire | LOWE2 |
| n/a | Lupinus ?cymba-egressus C.P. Sm. (pro sp.) [andersonii ? fulcratus] | LUCY2 |
| n/a | Lupinus ?inyoensis Heller (pro sp.) [caudatus ? palmeri] | LUIN |
| n/a | Lupinus angustifolius L. ssp. reticulatus (Desv.) Arcang. | LUANR2 |
| n/a | Lupinus atlanticus Gladst. | LUAT |
| n/a | Lupinus hartmannii C.P. Sm. [excluded] | LUHA6 |
| n/a | Lupinus hartwegii Lindl. [excluded] | LUHA7 |
| n/a | Lupinus hilarianus Benth. | LUHI6 |
| n/a | Lupinus insignis Glaz. ex C. P. Sm. | LUIN2 |
| n/a | Lupinus latifolius Lindl. ex J.G. Agardh ssp. wigginsii (C.P. Sm.) Kenney [excluded] | LULAW2 |
| n/a | Lupinus palaestinus Boiss. | LUPA13 |
| n/a | Lupinus polyphyllus Lindl. var. pallidipes (A. Heller) C. P. Sm. | LUPOP6 |
| n/a | Macroptilium bracteatum (Nees & Mart.) Marechal & Baudet | MABR11 |
| n/a | Macrotyloma tenuiflorum (Micheli) Verdc. | MATE18 |
| n/a | Medicago blancheana Boiss. | MEBL2 |
| n/a | Medicago brachycarpa Fisch. ex M. Bieb. | MEBR9 |
| n/a | Medicago carstiensis Jacq. | MECA19 |
| n/a | Medicago ciliaris (L.) All. | MECI12 |
| n/a | Medicago doliata Carmign. | MEDO2 |
| n/a | Medicago doliata Carmign. var. muricata Heyn | MEDOM |
| n/a | Medicago granadensis Willd. | MEGR11 |
| n/a | Medicago intertexta (L.) Mill. | MEIN16 |
| n/a | Medicago italica (Mill.) Fiori | MEIT2 |
| n/a | Medicago lupulina L. var. willdenowii Boenn. | MELUW2 |
| n/a | Medicago marina L. | MEMA14 |
| n/a | Medicago murex Willd. | MEMU8 |
| n/a | Medicago noeana Boiss. | MENO6 |
| n/a | Medicago platycarpos (L.) Trautv. | MEPL2 |
| n/a | Medicago polyceratia (L.) Trautv. | MEPO11 |
| n/a | Medicago popovii (Korovin) Sirj. | MEPO12 |
| n/a | Medicago rotata Boiss. | MERO5 |
| n/a | Medicago sativa L. ssp. ?tunetana Murb. | MESAT |
| n/a | Medicago sativa L. ssp. caerulea (Less. ex Ledeb.) Schmalh. | MESAC2 |
| n/a | Medicago sativa L. ssp. glomerata (Balb.) Rouy | MESAG2 |
| n/a | Medicago secundiflora Dur. [excluded] | MESE9 |
| n/a | Medicago shepardii Post ex Boiss. | MESH3 |
| n/a | Medicago soleirolii Duby | MESO3 |
| n/a | Melilotus hirsutus Lipsky | MEHI8 |
| n/a | Melilotus infestus Guss. | MEIN18 |
| n/a | Melilotus italicus (L.) Lam. | MEIT |
| n/a | Melilotus segetalis (Brot.) Ser. | MESE8 |
| n/a | Melilotus siculus (Turra) Vitman ex B. D. Jacks. | MESI5 |
| n/a | Melilotus speciosus Durieu | MESP9 |
| n/a | Melilotus tauricus (M. Bieb.) Ser. | META4 |
| n/a | Melilotus wolgicus Poir. | MEWO3 |
| n/a | Melolobium aethiopicum (L.) Druce | MEAE3 |
| n/a | Melolobium Eckl. & Zeyh. | MELOL |
| n/a | Melolobium exudans Harv. | MEEX3 |
| n/a | Millettia Wight & Arn. | MILLE |
| n/a | Mucuna platyphylla A.Gray | MUPL2 |
| n/a | Mucuna sloanei Fawcett & Rendle var. persericea Wilmot-Dear | MUSLP |
| n/a | Onobrychis altissima Grossh. | ONAL4 |
| n/a | Onobrychis arenaria (Kit.) DC. | ONAR2 |
| n/a | Onobrychis arenaria (Kit.) DC. ssp. arenaria | ONARA |
| n/a | Onobrychis arenaria (Kit.) DC. ssp. sibirica (Sirj.) P. W. Ball | ONARS |
| n/a | Onobrychis argentea Boiss. | ONAR3 |
| n/a | Onobrychis biebersteinii Sirj. | ONBI |
| n/a | Onobrychis gaubae Bornm. | ONGA |
| n/a | Onobrychis grandis Lipsky | ONGR3 |
| n/a | Onobrychis hajastana Grossh. | ONHA |
| n/a | Onobrychis hypargyrea Boiss. | ONHY |
| n/a | Onobrychis iberica Grossh. | ONIB |
| n/a | Onobrychis inermis Steven | ONIN2 |
| n/a | Onobrychis megataphros Boiss. | ONME2 |
| n/a | Onobrychis melanotricha Boiss. | ONME3 |
| n/a | Onobrychis oxyodonta Boiss. | ONOX |
| n/a | Onobrychis pallasii (Willd.) M. Bieb. | ONPA3 |
| n/a | Onobrychis persica Sirj. & Rech. f. | ONPE |
| n/a | Onobrychis petraea (M. Bieb. ex Willd.) Fisch. | ONPE2 |
| n/a | Onobrychis saxatilis (L.) Lam. | ONSA2 |
| n/a | Onobrychis transcaucasica Grossh. | ONTR3 |
| n/a | Onobrychis vaginalis C. A. Mey. | ONVA2 |
| n/a | Ononis biflora Desf. | ONBI2 |
| n/a | Ononis mitissima L. | ONMI2 |
| n/a | Ononis natrix L. | ONNA |
| n/a | Ononis ornithopodioides L. | ONOR |
| n/a | Ononis pubescens L. | ONPU |
| n/a | Ononis pusilla L. | ONPU2 |
| n/a | Ononis reclinata L. | ONRE2 |
| n/a | Ononis rotundifolia L. | ONRO |
| n/a | Ononis serrata Forssk. | ONSE2 |
| n/a | Ononis sicula Guss. | ONSI3 |
| n/a | Ononis speciosa Lag. | ONSP2 |
| n/a | Ononis viscosa L. | ONVI5 |
| n/a | Otholobium candicans (Eckl. & Zeyh.) C. H. Stirt. | OTCA2 |
| n/a | Otholobium Stirton | OTHOL |
| n/a | Oxylobium Andrews | OXYLO |
| n/a | Oxylobium ellipticum (Vent.) R. Br. | OXEL |
| n/a | Oxytropis halleri Bunge ex W. D. J. Koch | OXHA2 |
| n/a | Parkia timoriana (DC.) Merr. | PATI5 |
| n/a | Parochetus Buch.-Ham. ex D. Don | PAROC |
| n/a | Periandra Cambess. | PERIA |
| n/a | Periandra heterophylla Benth. | PEHE8 |
| n/a | Pericopsis mooniana Thw. | PEMO13 |
| n/a | Pericopsis Thwaites | PERIC5 |
| n/a | Piscidia mollis Rose | PIMO8 |
| n/a | Pomaria Cav. | POMAR |
| n/a | Prosopis alpataco Phil. | PRAL11 |
| n/a | Prosopis argentina Burkart | PRAR6 |
| n/a | Prosopis burkartii Mu?oz | PRBU2 |
| n/a | Prosopis caldenia Burkart | PRCA9 |
| n/a | Prosopis campestris Griseb. | PRCA11 |
| n/a | Prosopis castellanosii Burkart | PRCA12 |
| n/a | Prosopis denudans Benth. | PRDE4 |
| n/a | Prosopis elata (Burkart) Burkart | PREL5 |
| n/a | Prosopis ferox Griseb. | PRFE2 |
| n/a | Prosopis fiebrigii Harms | PRFI4 |
| n/a | Prosopis hassleri Harms ex Hassler | PRHA4 |
| n/a | Prosopis humilis Gill. ex Hook. | PRHU3 |
| n/a | Prosopis kuntzei Harms ex Hassler | PRKU2 |
| n/a | Prosopis palmeri S. Wats. | PRPA10 |
| n/a | Prosopis rojasiana Burkart | PRRO4 |
| n/a | Prosopis ruizlealii Burkart | PRRU4 |
| n/a | Prosopis ruscifolia Griseb. | PRRU5 |
| n/a | Prosopis sericantha Gill. ex Hook. | PRSE5 |
| n/a | Prosopis torquata DC. | PRTO3 |
| n/a | Pseudarthria hookeri Wight & Arn. | PSHO6 |
| n/a | Pseudarthria Wight & Arn. | PSEUD49 |
| n/a | Psorothamnus emoryi (Gray) Rydb. var. arenarius (Brandeg.) Barneby [excluded] | PSEMA |
| n/a | Rhynchosia calosperma Warb. | RHCA21 |
| n/a | Rhynchosia densiflora (Roth) DC. | RHDE6 |
| n/a | Rhynchosia densiflora (Roth) DC. ssp. chrysadenia (Taub.) Verdc. | RHDEC |
| n/a | Rhynchosia malacophylla (Spreng.) Bojer | RHMA13 |
| n/a | Rhynchosia minima (L.) DC. var. prostrata (Harv.) Meikle | RHMIP |
| n/a | Rhynchosia sublobata (Schumach.) Meikle | RHSU12 |
| n/a | Rhynchosia usambarensis Taub. | RHUS2 |
| n/a | Robinia ?ambigua Poir. (pro sp.) [pseudoacacia ? viscosa] | ROAM2 |
| n/a | Robinia ?holdtii Beissn. [neomexicana ? pseudoacacia] | ROHO |
| n/a | Robinia ?longiloba Ashe (pro sp.) [hispida ? viscosa] | ROLO2 |
| n/a | Robinia ?margarettiae Ashe (pro sp.) [hispida ? pseudoacacia] | ROMA |
| n/a | Scorpiurus vermiculatus L. | SCVE8 |
| n/a | Securigera DC. | SECUR3 |
| n/a | Securigera orientalis (Mill.) Lassen | SEOR9 |
| n/a | Securigera parviflora (Desv.) Lassen | SEPA17 |
| n/a | Senna ?floribunda (Cav.) Irwin & Barneby [multiglandulosa ? septentrionalis] | SEFL4 |
| n/a | Senna aciphylla (Benth.) Randell | SEAC9 |
| n/a | Senna angulata (Vogel) H. S. Irwin & Barneby | SEAN9 |
| n/a | Senna artemisioides (Gaud. ex DC.) Randell ssp. circinnata (Benth.) Randell | SEARC2 |
| n/a | Senna artemisioides (Gaud. ex DC.) Randell ssp. petiolaris Randell | SEARP |
| n/a | Senna artemisioides (Gaud. ex DC.) Randell ssp. zygophylla (Benth.) Randell | SEARZ |
| n/a | Senna candolleana (Vogel) H.S. Irwin & Barneby | SECA25 |
| n/a | Senna coronilloides (Benth.) Randell | SECO18 |
| n/a | Senna fructicosa (P. Mill.) Irwin & Barneby [excluded] | SEFR7 |
| n/a | Senna glutinosa (DC.) Randell | SEGL11 |
| n/a | Senna glutinosa (DC.) Randell ssp. chatelainiana (Gaudich.) Randell | SEGLC |
| n/a | Senna hirsuta (L.) Irwin & Barneby var. leptocarpa (Benth.) H. S. Irwin & Barneby | SEHIL |
| n/a | Senna macranthera (Collad.) H. S. Irwin & Barneby | SEMA21 |
| n/a | Senna macranthera (Collad.) H. S. Irwin & Barneby var. micans (Nees) H. S. Irwin & Barneby | SEMAM |
| n/a | Senna notabilis (F. Muell.) Randell | SENO3 |
| n/a | Senna odorata (R. Morris) Randell | SEOD |
| n/a | Senna petersiana (Bolle) Lock | SEPE9 |
| n/a | Senna pleurocarpa (F. Muell.) Randell | SEPL9 |
| n/a | Senna pleurocarpa (F. Muell.) Randell var. pleurocarpa | SEPLP |
| n/a | Senna rostrata (Mart.) Irwin & Barneby [excluded] | SERO11 |
| n/a | Senna spectabilis (DC.) Irwin & Barneby var. excelsa (Schrad.) H. S. Irwin & Barneby | SESPE |
| n/a | Senna splendida (Vogel) H. S. Irwin & Barneby | SESP10 |
| n/a | Senna stipulacea (Aiton) H. S. Irwin & Barneby | SEST9 |
| n/a | Serianthes Benth. | SERIA |
| n/a | Sesbania exasperata Kunth | SEEX4 |
| n/a | Sesbania javanica Miq. | SEJA3 |
| n/a | Sesbania paulensis Barb. Rodr. | SEPA14 |
| n/a | Sesbania speciosa Taub. | SESP11 |
| n/a | Sesbania tetraptera Hochst. ex Baker | SETE12 |
| n/a | Sophora davidii (Franch.) Skeels | SODA3 |
| n/a | Sophora velutina Lindl. | SOVE8 |
| n/a | Sophora velutina Lindl. ssp. zimbabweensis J. B. Gillett & Brummitt | SOVEZ |
| n/a | Strongylodon lucidus (G. Forst.) Seem. | STLU5 |
| n/a | Stylosanthes capitata Vogel | STCA28 |
| n/a | Stylosanthes guianensis (Aubl.) Sw. | STGU80 |
| n/a | Stylosanthes guianensis (Aubl.) Sw. var. guianensis | STGUG |
| n/a | Stylosanthes montevidensis Vogel | STMO7 |
| n/a | Stylosanthes sundaica Taub. | STSU7 |
| n/a | Styphnolobium Schott | STYPH2 |
| n/a | Tephrosia ?floridana (Vail) Isely [chrysophylla ? florida] | TEFL2 |
| n/a | Tephrosia nitens Benth. ex Seem. | TENI2 |
| n/a | Tephrosia oxygona Welw. ex Baker | TEOX2 |
| n/a | Tephrosia richardsiae J. B. Gillett | TERI2 |
| n/a | Tephrosia subtriflora Hochst. ex Baker | TESU3 |
| n/a | Tephrosia vestita Vogel | TEVE2 |
| n/a | Tephrosia villosa (L.) Pers. | TEVI8 |
| n/a | Tephrosia villosa (L.) Pers. ssp. villosa | TEVIV |
| n/a | Teramnus repens (Taub.) Baker f. | TERE6 |
| n/a | Teramnus volubilis Sw. | TEVO3 |
| n/a | Tipuana Benth. | TIPUA |
| n/a | Trifolium affine C. Presl | TRAF4 |
| n/a | Trifolium baccarinii Chiov. | TRBA4 |
| n/a | Trifolium badium Schreb. | TRBA7 |
| n/a | Trifolium burchellianum Ser. var. johnstonii (Oliv.) J. B. Gillett | TRBUJ |
| n/a | Trifolium campestre Schreb. var. minus (W. D. J. Koch) Kozuharov | TRCAM |
| n/a | Trifolium cherleri L. | TRCH6 |
| n/a | Trifolium cryptopodium Steud. ex A. Rich. | TRCR15 |
| n/a | Trifolium dasyurum C. Presl | TRDA5 |
| n/a | Trifolium dichroanthum Boiss. | TRDI14 |
| n/a | Trifolium echinatum Bieb. var. carmeli (Boiss.) Gibelli & Belli | TRECC |
| n/a | Trifolium isthmocarpum Brot. | TRIS5 |
| n/a | Trifolium leucanthum M. Bieb. | TRLE7 |
| n/a | Trifolium lucanicum Gasp. ex Guss. | TRLU6 |
| n/a | Trifolium medium L. var. sarosiense (Hazsl.) Savul. & Rayss | TRMES2 |
| n/a | Trifolium monanthum Gray ssp. vaughanae J. Gillett [excluded] | TRMOV |
| n/a | Trifolium mutabile Port. | TRMU7 |
| n/a | Trifolium nigrescens Viviani ssp. petrisavii (Clementi) Holmboe | TRNIP |
| n/a | Trifolium obscurum Savi | TROB5 |
| n/a | Trifolium pallescens Schreb. | TRPA20 |
| n/a | Trifolium pallidum Waldst. & Kit. | TRPA21 |
| n/a | Trifolium pannonicum Jacq. ssp. elongatum (Willd.) Zohary | TRPAE |
| n/a | Trifolium patens Schreb. | TRPA24 |
| n/a | Trifolium physodes Steven ex M. Bieb. | TRPH5 |
| n/a | Trifolium pilulare Boiss. | TRPI9 |
| n/a | Trifolium polystachyum Fresen. | TRPO9 |
| n/a | Trifolium purseglovei J. B. Gillett | TRPU17 |
| n/a | Trifolium repens L. var. biasolettii (Steud. & Hochst.) Asch. & Graebn. | TRREB |
| n/a | Trifolium repens L. var. giganteum Larg.-Fossat [excluded] | TRREG3 |
| n/a | Trifolium resupinatum L. var. majus Boiss. | TRREM |
| n/a | Trifolium rubens L. | TRRU9 |
| n/a | Trifolium squarrosum L. | TRSQ2 |
| n/a | Trifolium strictum L. | TRST15 |
| n/a | Trifolium suffocatum L. [excluded] | TRSU12 |
| n/a | Trifolium sylvaticum Gerard ex Loisel. | TRSY |
| n/a | Trifolium thalii Vill. | TRTH4 |
| n/a | Trifolium tomentosum L. var. curvisepalum (Tackh.) Thiebaut | TRTOC |
| n/a | Trifolium trichocephalum M. Bieb. | TRTR16 |
| n/a | Trifolium tumens Steven ex M. Bieb. | TRTU5 |
| n/a | Trifolium usambarense Taub. | TRUS2 |
| n/a | Trifolium vernum Phil. | TRVE7 |
| n/a | Trigonella arabica Delile | TRAR13 |
| n/a | Trigonella cretica (L.) Boiss. | TRCR16 |
| n/a | Trigonella gladiata Steven ex M. Bieb. | TRGL11 |
| n/a | Tripodion Medik. | TRIPO4 |
| n/a | Tripodion tetraphyllum (L.) Fourr. | TRTE12 |
| n/a | Ulex gallii Planch. | ULGA |
| n/a | Ulex minor Roth [excluded] | ULMI3 |
| n/a | Vicia americana Muhl. ex Willd. ssp. mexicana C.R. Gunn [excluded] | VIAMM4 |
| n/a | Vicia amoena Fisch. | VIAM5 |
| n/a | Vicia amurensis Oett. | VIAM7 |
| n/a | Vicia anatolica Turrill | VIAN9 |
| n/a | Vicia andicola Kunth | VIAN8 |
| n/a | Vicia assyriaca Boiss. | VIAS3 |
| n/a | Vicia biennis L. | VIBI4 |
| n/a | Vicia canescens Labill. | VICA20 |
| n/a | Vicia canescens Labill. ssp. gregaria (Boiss. & Heldr.) P. H. Davis | VICAG |
| n/a | Vicia canescens Labill. ssp. variegata (Willd.) P. H. Davis | VICAV |
| n/a | Vicia cassubica L. | VICA21 |
| n/a | Vicia cracca L. ssp. incana (Gouan) Rouy | VICRI |
| n/a | Vicia cracca L. ssp. stenophylla (Velen.) P. H. Davis | VICRS |
| n/a | Vicia dumetorum L. | VIDU2 |
| n/a | Vicia filicaulis Webb & Berthel. | VIFI3 |
| n/a | Vicia galeata Boiss. | VIGA2 |
| n/a | Vicia graminea Sm. | VIGR6 |
| n/a | Vicia humilis Kunth | VIHU3 |
| n/a | Vicia incisa M. Bieb. | VIIN10 |
| n/a | Vicia lilacina Ledeb. | VILI8 |
| n/a | Vicia loiseleurii (M. Bieb.) Litv. | VILO8 |
| n/a | Vicia lutea L. ssp. vestita (Boiss.) Rouy | VILUV2 |
| n/a | Vicia magellanica Hook. f. | VIMA10 |
| n/a | Vicia melanops Sm. | VIME3 |
| n/a | Vicia michauxii Spreng. | VIMI9 |
| n/a | Vicia monantha Retz. ssp. triflora (Ten.) B. L. Burtt & P. Lewis | VIMOT |
| n/a | Vicia montevidensis Vogel | VIMO11 |
| n/a | Vicia noeana Reut. ex Boiss. | VINO4 |
| n/a | Vicia orobus DC. | VIOR5 |
| n/a | Vicia pyrenaica Pourr. | VIPY2 |
| n/a | Vicia ramuliflora (Maxim.) Ohwi | VIRA6 |
| n/a | Vicia sativa L. ssp. cordata (Wulfen ex Hoppe) Batt. | VISAC2 |
| n/a | Vicia sativa L. ssp. macrocarpa (Moris) Arcang. | VISAM |
| n/a | Vicia serratifolia Jacq. | VISE15 |
| n/a | Vicia sessiliflora Clos | VISE11 |
| n/a | Vicia setifolia Kunth | VISE16 |
| n/a | Vicia setifolia Kunth var. bonariensis Burkart | VISEB |
| n/a | Vicia venosa (Willd. ex Link) Maxim. | VIVE5 |
| n/a | Vicia venosa (Willd. ex Link) Maxim. var. cuspidata Maxim. | VIVEC |
| n/a | Vicia venosissima Nakai | VIVE6 |
| n/a | Vicia villosa Roth ssp. eriocarpa (Hausskn.) P. W. Ball | VIVIE |
| n/a | Vigna ambacensis Welw. ex Baker | VIAM8 |
| n/a | Vigna decipiens Harv. | VIDE5 |
| n/a | Vigna heterophylla A. Rich. | VIHE7 |
| n/a | Vigna lasiocarpa (Mart. ex Benth.) Verdc. | VILA13 |
| n/a | Vigna oblongifolia A. Rich. | VIOB7 |
| n/a | Vigna oblongifolia A. Rich. var. oblongifolia | VIOBO |
| n/a | Vigna praecox Verdc. | VIPR10 |
| n/a | Vigna schimperi Baker | VISC4 |
| n/a | Vigna unguiculata (L.) Walp. ssp. stenophylla (Harv.) Marechal et al. | VIUNS3 |
| n/a | Wiborgia obcordata (P. J. Bergius) Thunb. | WIOB |
| n/a | Wiborgia Thunb., nom. cons. | WIBOR |
| n/a | Wisteria ?formosa Rehd. [floribunda ? sinensis] | WIFO2 |
| n/a | Zornia brasiliensis Vogel | ZOBR2 |
| n/a | Zornia dyctiocarpa DC. | ZODY2 |
| n/a | Zornia gibbosa Span. | ZOGI |
| n/a | Zornia latifolia Sm. | ZOLA2 |
| 'awikiwiki | Canavalia galeata (Gaud.) Vogel | CAGA |
| Aaron's rod | Thermopsis villosa (Walt.) Fern. & Schub. | THVI |
| Abrams's lupine | Lupinus abramsii C.P. Sm. | LUAB |
| abrus | Abrus Adans. | ABRUS |
| Abrus precatorius | Abrus abrus (L.) W. Wight | ABAB2 |
| Abyssinia entada | Entada abyssinica Steudel ex A. Rich. | ENAB |
| acacia | Acacia ampliceps Maslin | ACAM9 |
| acacia | Acacia glauca (L.) Moench | ACGL4 |
| acacia | Acacia ligulata Benth. | ACLI8 |
| acacia | Acacia P. Mill. | ACACI |
| acacia | Acacia rehmanniana Schinz | ACRE8 |
| acacia | Acacia sclerosperma F. Muell. | ACSC10 |
| acacia | Acacia sophorae (Labill.) R.Br. | ACSO4 |
| acacia | Faidherbia A. Chev. | FAIDH |
| Acacia acinacea | Acacia cyclophylla Schltdl. | ACCY3 |
| Acacia adunca | Acacia accola Maiden & Betche | ACAC6 |
| Acacia angustissima var. hirta | Acacia hirta Nutt. | ACHI3 |
| Acacia angustissima var. hirta | Acaciella hirta (Nutt.) Britt. & Rose | ACHI4 |
| Acacia angustissima var. shrevei | Acacia hirta Nutt. ssp. lemmonii (Rose) Wiggins | ACHIL2 |
| Acacia angustissima var. shrevei | Acacia lemmonii Rose | ACLE3 |
| Acacia angustissima var. shrevei | Acaciella shrevei Britt. & Rose | ACSH2 |
| Acacia angustissima var. suffrutescens | Acacia angustissima (P. Mill.) Kuntze var. cuspidata (Schlecht.) L. Benson p.p. | ACANC2 |
| Acacia angustissima var. suffrutescens | Acacia cuspidata Schlecht. p.p. | ACCU |
| Acacia angustissima var. texensis | Acacia angustissima (P. Mill.) Kuntze var. cuspidata (Schlecht.) L. Benson p.p. | ACANC2 |
| Acacia angustissima var. texensis | Acacia cuspidata Schlecht. p.p. | ACCU |
| Acacia angustissima var. texensis | Acacia texensis Torr. & Gray | ACTE2 |
| Acacia berlandieri | Acacia emoryana Benth. | ACEM |
| Acacia caven | Acacia cavenia (Molina) Hook. & Arn. [orthographic variant] | ACCA28 |
| Acacia cibaria | Acacia brachystachya auct. | ACBR4 |
| Acacia collinsii | Acacia collinsii Saff. var. pseudomyrmex ined. [anomalous] | ACCOP3 |
| Acacia dealbata | Acacia decurrens (Wendl. f.) Willd. var. dealbata (Link) F. Muell. | ACDED |
| Acacia deanei ssp. paucijuga | Acacia paucijuga Wakef. | ACPA10 |
| Acacia decurrens | Mimosa decurrens Wendl. f. | MIDE17 |
| Acacia farnesiana | Acacia farnesiana (L.) Willd. var. farnesiana (L.) Willd. [superfluous autonym] | ACFAF2 |
| Acacia farnesiana | Acacia minuta (M.E. Jones) Beauchamp | ACMI4 |
| Acacia farnesiana | Acacia minuta (M.E. Jones) Beauchamp ssp. densiflora (Alexander ex Small) Beauchamp | ACMID |
| Acacia farnesiana | Acacia smallii Isely | ACSM |
| Acacia farnesiana | Mimosa farnesiana L. | MIFA |
| Acacia farnesiana | Pithecellobium minutum M.E. Jones | PIMI5 |
| Acacia farnesiana | Vachellia densiflora Alexander ex Small | VADE4 |
| Acacia farnesiana | Vachellia farnesiana (L.) Wight & Arn. | VAFA |
| Acacia genistifolia | Acacia diffusa Lindl. | ACDI9 |
| Acacia glauca | Acacia villosa (Sw.) Willd. | ACVI8 |
| Acacia greggii var. greggii | Acacia greggii Gray var. arizonica Isely | ACGRA |
| Acacia greggii var. wrightii | Acacia wrightii Benth. | ACWR |
| Acacia hemiteles | Acacia graffiana F. Muell. | ACGR10 |
| Acacia koa | Acacia kauaiensis Hbd. | ACKA |
| Acacia koa | Acacia koa Gray var. hawaiiensis Rock | ACKOH |
| Acacia koa | Acacia koa Gray var. lanaiensis Rock | ACKOL |
| Acacia koa | Acacia koa Gray var. waimeae Hochr. | ACKOW |
| Acacia lanuginophylla | Acacia lanuginosa C. A. Gardner, nom. illeg. [anomalous] | ACLA11 |
| Acacia longifolia | Acacia latifolia hort. | ACLA |
| Acacia longifolia ssp. sophorae | Acacia longifolia (Andr.) Willd. var. sophorae (Labill.) F. Muell. ex Benth. | ACLOS2 |
| Acacia longissima | Acacia linearis Sims | ACLI4 |
| Acacia mearnsii | Acacia decurrens (Wendl. f.) Willd. var. mollis Lindl. | ACDEM |
| Acacia mellifera ssp. detinens | Acacia detinens Burch. | ACDE13 |
| Acacia muricata | Mimosa muricata L. | MIMU4 |
| Acacia neovernicosa | Acacia constricta Benth. var. vernicosa (Standl.) L. Benson | ACCOV |
| Acacia neovernicosa | Acacia vernicosa Standl. | ACVE |
| Acacia nilotica | Acacia arabica (Lam.) Willd. | ACAR11 |
| Acacia nilotica | Mimosa nilotica L. | MINI2 |
| Acacia nilotica ssp. adstringens | Acacia nilotica (L.) Willd. ex Delile ssp. adansonii (Guill. & Perr.) Brenan | ACNIA2 |
| Acacia omalophylla | Acacia homalophylla A. Cunn. ex Benth., orth. var. | ACHO3 |
| Acacia pachyceras var. najdensis | Acacia gerrardii Benth. ssp. negevensis Zohary | ACGEN2 |
| Acacia papyrocarpa | Acacia sowdenii Maiden | ACSO3 |
| Acacia paradoxa | Acacia armata R. Br. | ACAR15 |
| Acacia pinetorum | Vachellia insularis Small | VAIN2 |
| Acacia pinetorum | Vachellia peninsularis Small | VAPE2 |
| Acacia polyacantha | Acacia suma (Roxb.) Buch.-Ham. ex Voigt | ACSU2 |
| Acacia polyacantha ssp. campylacantha | Acacia campylacantha Hochst. ex A. Rich. | ACCA26 |
| Acacia retusa | Acacia riparia auct. non Kunth [misapplied] | ACRI4 |
| Acacia retusa | Acacia westiana DC. | ACWE |
| Acacia retusa | Senegalia westiana (DC.) Britt. & Rose | SEWE4 |
| Acacia rigidula | Acacia amentacea DC. | ACAM3 |
| Acacia roemeriana | Acacia malacophylla Benth. | ACMA2 |
| Acacia saligna | Acacia cyanophylla Lindl. | ACCY |
| Acacia senegal | Acacia verek Guillemin & Perrottet | ACVE3 |
| Acacia stowardii | Acacia clivicola Pedley | ACCL2 |
| Acacia sublanata | Acacia luehmannii F. Muell. | ACLU2 |
| Acacia tortuosa | Mimosa tortuosa L. | MITO3 |
| Acacia tortuosa | Poponax tortuosa (L.) Raf. | POTO2 |
| Acacia ulicifolia | Acacia juniperina (Vent.) Willd. | ACJU2 |
| Acacia victoriae | Acacia sentis F. Muell. ex Benth., nom. illeg. [anomalous] | ACSE9 |
| Acacia vogeliana | Lysiloma ambiguum Urban | LYAM4 |
| Ackerman's milkvetch | Astragalus ackermanii Barneby | ASAC5 |
| Adesmia tenella | Adesmia angustifolia Hook. & Arn. | ADAN3 |
| adzuki bean | Vigna angularis (Willd.) Ohwi & Ohashi | VIAN7 |
| Aeschynomene americana | Aeschynomene americana L. var. glandulosa (Poir.) Rudd | AEAMG |
| Aeschynomene gracilis | Aeschynomene portoricensis Urban | AEPO2 |
| Aeschynomene histrix var. incana | Secula histrix (Poir.) Small p.p. | SEHI4 |
| Aeschynomene paniculata | Aeschynomene paniculatus Willd. ex Vog. [orthographic variant] | AEPA4 |
| Aeschynomene viscidula | Secula viscidula (Michx.) Small | SEVI9 |
| African clover | Trifolium africanum Ser. | TRAF3 |
| African copaiba balsam tree | Daniellia oliveri (Rolfe) Hutch. & Dalziel | DAOL |
| African locust bean | Parkia filicoidea Welw. ex Oliver | PAFI12 |
| African mahogany | Afzelia africana Smith ex Pers. | AFAF |
| African mesquite | Prosopis africana (Guillemin, Perrottet, & A. Rich.) Taubert | PRAF2 |
| African plume | Bauhinia galpinii N.E. Br. | BAGA |
| African rattlebox | Crotalaria saltiana Andr. | CRSA8 |
| African senna | Senna didymobotrya (Fresen.) Irwin & Barneby | SEDI8 |
| African yam bean | Sphenostylis stenocarpa (Hochst. ex A. Rich.) Harms | SPST8 |
| Agardh lupine | Lupinus agardhianus Heller | LUAG |
| ajipo | Pachyrhizus tuberosus (Lam.) Spreng. | PATU7 |
| Aladdin's slippers | Astragalus amphioxys Gray var. vespertinus (Sheldon) M.E. Jones | ASAMV |
| albaida | Anthyllis cytisoides L. | ANCY3 |
| albizia | Albizia Durazz. | ALBIZ |
| albizia | Albizia ferruginea (Guillemin & Perrottet) Benth. | ALFE |
| albizia | Albizia odoratissima (L. f.) Benth. | ALOD |
| albizia | Albizia zygia (DC.) Macbr. | ALZY |
| Albizia carbonaria | Pithecellobium carbonarium (Britt.) Niez. & Nevl. | PICA11 |
| Albizia chinensis | Albizia stipulata (Roxb.) Boivin | ALST9 |
| Albizia lebbeck | Mimosa lebbeck L. | MILE6 |
| Albizia procera | Mimosa procera Roxb. | MIPR4 |
| Albuquerque prairie clover | Dalea scariosa S. Wats. | DASC4 |
| Alefeld's pea | Lathyrus vestitus Nutt. ssp. alefeldii (White) Broich | LAVEA |
| Alexandrian senna | Senna alexandrina P. Mill. | SEAL5 |
| alfalfa | Medicago L. | MEDIC |
| alfalfa | Medicago ruthenica (L.) Trautv. | MERU6 |
| alfalfa | Medicago sativa L. | MESA |
| alfalfa | Medicago sativa L. ssp. sativa | MESAS |
| algarrobilla | Senna sophera (L.) Roxb. | SESO2 |
| algarrobo | Prosopis chilensis (Molina) Stuntz | PRCH2 |
| algarrobo blanco | Prosopis alba Griseb. | PRAL8 |
| algarrobo negro | Prosopis nigra Griseb. ex Hieron. | PRNI3 |
| alhagi | Alhagi Gagnebin | ALHAG |
| Alhagi maurorum | Alhagi camelorum Fisch. | ALCA |
| Alhagi maurorum | Alhagi pseudalhagi (Bieb.) Desv. ex B. Keller & Schaparenko | ALPS3 |
| alkali milkvetch | Astragalus tener Gray | ASTE6 |
| alkali milkvetch | Astragalus tener Gray var. tener | ASTET2 |
| alkali swainsonpea | Sphaerophysa salsula (Pallas) DC. | SPSA3 |
| Allegheny Mountain goldenbanner | Thermopsis mollis (Michx.) M.A. Curtis ex Gray | THMO2 |
| alpine clover | Trifolium alpinum L. | TRAL11 |
| alpine clover | Trifolium dasyphyllum Torr. & Gray | TRDA2 |
| alpine clover | Trifolium dasyphyllum Torr. & Gray ssp. anemophilum (Greene) J. Gillett | TRDAA |
| alpine clover | Trifolium dasyphyllum Torr. & Gray ssp. dasyphyllum | TRDAD |
| alpine milkvetch | Astragalus alpinus L. | ASAL7 |
| alpine milkvetch | Astragalus alpinus L. var. alpinus | ASALA4 |
| alpine milkvetch | Astragalus alpinus L. var. brunetianus Fern. | ASALB |
| alpine sweetvetch | Hedysarum alpinum L. | HEAL |
| alpine sweetvetch | Hedysarum alpinum L. var. alpinum | HEALA3 |
| alsike clover | Trifolium hybridum L. | TRHY |
| alverjilla | Adesmia bicolor (Poir.) DC. | ADBI3 |
| Alvord milkvetch | Astragalus alvordensis M.E. Jones | ASAL9 |
| alyce clover | Alysicarpus ovalifolius (Schumacher) J. L?onard | ALOV |
| ambatch | Aeschynomene elaphroxylon (Guillemin & Perrottet) Taubert | AEEL2 |
| amberique-bean | Strophostyles helvola (L.) Elliott | STHE9 |
| American bird's-foot trefoil | Lotus unifoliolatus (Hook.) Benth. | LOUN |
| American bird's-foot trefoil | Lotus unifoliolatus (Hook.) Benth. var. unifoliolatus | LOUNU |
| American hogpeanut | Amphicarpaea bracteata (L.) Fern. | AMBR2 |
| American hogpeanut | Amphicarpaea bracteata (L.) Fern. var. bracteata | AMBRB |
| American hogpeanut | Amphicarpaea bracteata (L.) Fern. var. comosa (L.) Fern. | AMBRC |
| American licorice | Glycyrrhiza lepidota Pursh | GLLE3 |
| American milkvetch | Astragalus americanus (Hook.) M.E. Jones | ASAM3 |
| American scurfpea | Cullen americanum (L.) Rydb. | CUAM5 |
| American senna | Senna hebecarpa (Fern.) Irwin & Barneby | SEHE3 |
| American snoutbean | Rhynchosia americana (Houst. ex P. Mill.) M.C. Metz | RHAM |
| American vetch | Vicia americana Muhl. ex Willd. | VIAM |
| American vetch | Vicia americana Muhl. ex Willd. ssp. americana | VIAMA3 |
| American wisteria | Wisteria frutescens (L.) Poir. | WIFR |
| Ames's milkvetch | Astragalus pulsiferae Gray | ASPU7 |
| Ames's milkvetch | Astragalus pulsiferae Gray var. pulsiferae | ASPUP5 |
| amor seco | Desmodium affine Schlecht. | DEAF |
| Amorpha californica var. californica | Amorpha californica Nutt. var. hispidula (Greene) Palmer | AMCAH |
| Amorpha canescens | Amorpha brachycarpa Palmer | AMBR6 |
| Amorpha fruticosa | Amorpha angustifolia (Pursh) Boynt. | AMAN2 |
| Amorpha fruticosa | Amorpha bushii Rydb. | AMBU2 |
| Amorpha fruticosa | Amorpha croceolanata P.W. Wats. | AMCR3 |
| Amorpha fruticosa | Amorpha curtissii Rydb. | AMCU4 |
| Amorpha fruticosa | Amorpha dewinkeleri Small | AMDE3 |
| Amorpha fruticosa | Amorpha fruticosa L. var. angustifolia Pursh | AMFRA |
| Amorpha fruticosa | Amorpha fruticosa L. var. croceolanata (P.W. Wats.) P.W. Wats. ex Mouillef. | AMFRC |
| Amorpha fruticosa | Amorpha fruticosa L. var. emarginata Pursh | AMFRE |
| Amorpha fruticosa | Amorpha fruticosa L. var. oblongifolia Palmer | AMFRO2 |
| Amorpha fruticosa | Amorpha fruticosa L. var. occidentalis (Abrams) Kearney & Peebles | AMFRO |
| Amorpha fruticosa | Amorpha fruticosa L. var. tennesseensis (Shuttlw. ex Kunze) Palmer | AMFRT |
| Amorpha fruticosa | Amorpha occidentalis Abrams | AMOC |
| Amorpha fruticosa | Amorpha occidentalis Abrams var. arizonica (Rydb.) Palmer | AMOCA |
| Amorpha fruticosa | Amorpha occidentalis Abrams var. emarginata (Pursh) Palmer | AMOCE |
| Amorpha fruticosa | Amorpha tennesseensis Shuttlw. ex Kunze | AMTE7 |
| Amorpha fruticosa | Amorpha virgata Small | AMVI3 |
| Amorpha georgiana var. confusa | Amorpha cyanostachya auct. p.p., non M.A. Curtis | AMCY |
| Amorpha herbacea var. crenulata | Amorpha crenulata Rydb. | AMCR5 |
| Amorpha herbacea var. herbacea | Amorpha cyanostachya M.A. Curtis | AMCY2 |
| Amorpha herbacea var. herbacea | Amorpha floridana Rydb. | AMFL4 |
| Amorpha herbacea var. herbacea | Amorpha herbacea Walt. var. floridana (Rydb.) Wilbur | AMHEF |
| Amorpha roemeriana | Amorpha texana Buckl. | AMTE2 |
| amphibious lupine | Lupinus amphibius Suksdorf | LUAM2 |
| Amphicarpaea bracteata | Amphicarpaea monoica (L.) Elliott | AMMO5 |
| Amphicarpaea bracteata var. comosa | Amphicarpaea comosa (L.) G. Don | AMCO6 |
| Amphicarpaea bracteata var. comosa | Amphicarpaea pitcheri Torr. & Gray | AMPI |
| Amphicarpaea bracteata var. comosa | Falcata comosa (L.) Kuntze | FACO2 |
| Amphicarpaea bracteata var. comosa | Falcata pitcheri (Torr. & Gray) Kuntze | FAPI |
| Amphicarpaea bracteata var. comosa | Glycine comosa L. | GLCO4 |
| Amur maackia | Maackia amurensis Rupr. & Maxim. | MAAM9 |
| anadenanthera | Anadenanthera Speg. | ANADE |
| Anadenanthera peregrina | Niopa peregrina (L.) Britt. & Rose | NIPE |
| Anadenanthera peregrina | Piptadenia peregrina (L.) Benth. | PIPE3 |
| Andean prairie clover | Dalea cylindriceps Barneby | DACY |
| Andean senna | Senna monozyx (Irwin & Barneby) Irwin & Barneby | SEMO11 |
| Anderson's lupine | Lupinus andersonii S. Wats. | LUAN2 |
| Anderson's milkvetch | Astragalus andersonii Gray | ASAN2 |
| andira | Andira Juss. | ANDIR |
| Andira inermis | Andira jamaicensis (W. Wright) Urban | ANJA |
| Andira inermis | Geoffrea inermis W. Wright | GEIN |
| Andrews's clover | Trifolium barbigerum Torr. var. andrewsii Gray | TRBAA |
| angled pea | Lathyrus angulatus L. | LAAN3 |
| anil de pasto | Indigofera suffruticosa P. Mill. | INSU |
| anil falso | Coursetia caribaea (Jacq.) Lavin | COCA31 |
| anil falso | Coursetia caribaea (Jacq.) Lavin var. caribaea | COCAC6 |
| anil falso | Coursetia caribaea (Jacq.) Lavin var. sericea (Gray) Lavin | COCAS2 |
| anil racimillo | Tephrosia senna Kunth | TESE2 |
| annual desert milkvetch | Astragalus aridus Gray | ASAR5 |
| annual vetchling | Lathyrus annuus L. | LAAN7 |
| annual yellow sweetclover | Melilotus indicus (L.) All. | MEIN2 |
| Anthony Peak lupine | Lupinus antoninus Eastw. | LUAN5 |
| Anthyllis vulneraria ssp. polyphylla | Anthyllis polyphylla (DC.) Kit. ex G. Don | ANPO7 |
| Antilles bean | Vigna antillana (Urban) Fawcett & Rendle | VIAN3 |
| Apache milkvetch | Astragalus nutriosensis Sanderson | ASNU7 |
| Apalachicola wild indigo | Baptisia megacarpa Chapman ex Torr. & Gray | BAME |
| Apios americana | Apios americana Medik. var. turrigera Fern. | APAMT |
| Apios americana | Glycine apios L. | GLAP |
| Apios priceana | Glycine priceana (B.L. Robins.) Britt. | GLPR |
| apple blossom | Cassia javanica L. | CAJA3 |
| apple blossom | Cassia javanica L. var. indochinensis Gagnepain | CAJAI |
| Applegate's milkvetch | Astragalus applegatei M.E. Peck | ASAP |
| applering acacia | Faidherbia albida (Del.) A. Chev. | FAAL |
| Arabian pea | Bituminaria bituminosa (L.) Stirton | BIBI4 |
| Arachis hagenbeckii | Arachis glabrata Benth. var. hagenbeckii (Harms) F.J. Herm. | ARGLH4 |
| Arboles milkvetch | Astragalus oocalycis M.E. Jones | ASOO |
| arcane milkvetch | Astragalus obscurus S. Wats. | ASOB4 |
| arctic locoweed | Oxytropis arctica R. Br. | OXAR2 |
| arctic locoweed | Oxytropis arctica R. Br. var. arctica | OXARA |
| arctic lupine | Lupinus arcticus S. Wats. | LUAR2 |
| arctic lupine | Lupinus arcticus S. Wats. ssp. arcticus | LUARA4 |
| Argentine screwbean | Prosopis strombulifera (Lam.) Benth. | PRST3 |
| Argentine senna | Senna corymbosa (Lam.) Irwin & Barneby | SECO9 |
| Argyrolobium arabicum | Argyrolobium abyssinicum Jaub. & Spach | ARAB6 |
| Argyrolobium rupestre ssp. remotum | Argyrolobium virgatum Baker | ARVI18 |
| Argyrolobium zanonii | Argyrolobium linnaeanum Walp. | ARLI10 |
| Arizona lupine | Lupinus arizonicus (S. Wats.) S. Wats. | LUAR4 |
| Arizona lupine | Lupinus arizonicus (S. Wats.) S. Wats. ssp. arizonicus | LUARA7 |
| Arizona lupine | Lupinus arizonicus (S. Wats.) S. Wats. ssp. arizonicus var. arizonicus | LUARA12 |
| Arizona lupine | Lupinus arizonicus (S. Wats.) S. Wats. ssp. arizonicus var. barbatulus (Thornb. ex C.P. Sm.) Thornb. ex I.M. Johnston | LUARB2 |
| Arizona lupine | Lupinus arizonicus (S. Wats.) S. Wats. ssp. setosissimus (C.P. Sm.) Christian & D. Dunn | LUARS4 |
| Arizona milkvetch | Astragalus arizonicus Gray | ASAR6 |
| Arizona mimosa | Mimosa distachya Cav. var. laxiflora (Benth.) Barneby | MIDIL |
| Arizona necklacepod | Sophora arizonica S. Wats. | SOAR3 |
| Arizona ticktrefoil | Desmodium arizonicum S. Wats. | DEAR2 |
| Arizona yellowhood | Nissolia wislizeni (Gray) Gray | NIWI |
| aroma | Dichrostachys cinerea (L.) Wight & Arn. | DICI2 |
| aromatic Indian breadroot | Pediomelum aromaticum (Payson) W.A. Weber | PEAR7 |
| arrowhead rattlebox | Crotalaria sagittalis L. | CRSA4 |
| arrowleaf butterfly pea | Centrosema sagittatum (Humb. & Bonpl. ex Willd.) Brandeg. ex Riley | CESA6 |
| arrowleaf clover | Trifolium vesiculosum Savi | TRVE |
| Ash Meadows milkvetch | Astragalus phoenix Barneby | ASPH |
| ashen hoarypea | Tephrosia cinerea (L.) Pers. | TECI2 |
| ashen milkvetch | Astragalus tephrodes Gray | ASTE8 |
| ashen milkvetch | Astragalus tephrodes Gray var. brachylobus (Gray) Barneby | ASTEB |
| ashen milkvetch | Astragalus tephrodes Gray var. chloridae (M.E. Jones) Barneby | ASTEC |
| ashen milkvetch | Astragalus tephrodes Gray var. remulcus (Gray) Barneby | ASTER2 |
| ashen milkvetch | Astragalus tephrodes Gray var. tephrodes | ASTET3 |
| Ashland's lupine | Lupinus aridus Dougl. ssp. ashlandensis Cox | LUARA |
| ashleaf goldenbanner | Thermopsis fraxinifolia Nutt. ex M.A. Curtis | THFR3 |
| Asian indigo | Indigofera oxycarpa Desv. | INOX |
| Asian indigo | Indigofera trita L. f. | INTR |
| Asian indigo | Indigofera trita L. f. ssp. scabra (Roth) de Kort & G. Thijsse | INTRS2 |
| Asian indigo | Indigofera trita L. f. ssp. subulata (Vahl ex Poiret) Ali | INTRS |
| Asian pigeonwings | Clitoria ternatea L. | CLTE3 |
| Asian ticktrefoil | Desmodium heterocarpon (L.) DC. | DEHE80 |
| Asian ticktrefoil | Desmodium heterocarpon (L.) DC. var. strigosum van Meeuwen | DEHES |
| aspalathus | Aspalathus L. | ASPAL2 |
| Aspalathus linearis | Aspalathus contaminatus auct. | ASCO39 |
| Aspalathus linearis | Borbonia pinifolia Marloth | BOPI3 |
| Aspalathus quinquefolia ssp. virgata | Aspalathus elongata Eckl. & Zeyh. | ASEL12 |
| aspen pea | Lathyrus laetivirens Greene ex Rydb. | LALA6 |
| Astragalus accidens var. hendersonii | Astragalus pachystachys Rydb. | ASPA27 |
| Astragalus accidens var. hendersonii | Astragalus watsonii Sheldon | ASWA7 |
| Astragalus accumbens | Astragalus missouriensis Nutt. var. accumbens (Sheldon) Isely | ASMIA2 |
| Astragalus aduncus | Astragalus kotschyanus Boiss. | ASKO2 |
| Astragalus agrestis | Astragalus danicus Retz. var. dasyglottis (Fisch. ex DC.) Boivin | ASDAD |
| Astragalus agrestis | Astragalus dasyglottis Fisch. ex DC. | ASDA3 |
| Astragalus agrestis | Astragalus goniatus Nutt. | ASGO4 |
| Astragalus agrestis | Astragalus hypoglottis Hook. | ASHY7 |
| Astragalus allochrous var. playanus | Astragalus wootonii Sheldon | ASWO2 |
| Astragalus allochrous var. playanus | Astragalus wootonii Sheldon var. typicus Barneby | ASWOT |
| Astragalus alopecuroides | Astragalus narbonensis Gouan | ASNA8 |
| Astragalus alpinus var. alpinus | Astragalus alpinus L. ssp. alaskanus Hult | ASALA5 |
| Astragalus alpinus var. alpinus | Astragalus alpinus L. ssp. arcticus Hult | ASALA9 |
| Astragalus alpinus var. alpinus | Astragalus astragalinus (Hook.) A.& D. L?ve | ASAS7 |
| Astragalus alpinus var. alpinus | Atelophragma alpinum (L.) Rydb. | ATAL2 |
| Astragalus alpinus var. brunetianus | Astragalus alpinus L. var. labradoricus (DC.) Fern. | ASALL |
| Astragalus americanus | Astragalus frigidus (L.) Gray p.p. | ASFR4 |
| Astragalus americanus | Astragalus frigidus (L.) Gray var. americanus (Hook.) S. Wats. | ASFRA |
| Astragalus americanus | Astragalus frigidus (L.) Gray var. gaspensis (Rouss.) Fern. | ASFRG |
| Astragalus americanus | Phaca americana (Hook.) Rydb. ex Small | PHAM10 |
| Astragalus amphioxys var. amphioxys | Astragalus amphioxys Gray var. melanocalyx (Rydb.) Tidestrom | ASAMM3 |
| Astragalus amphioxys var. musimonum | Astragalus musimonum Barneby | ASMU2 |
| Astragalus anxius | Astragalus tegetarioides M.E. Jones var. anxius (R.J. Meinke & Kaye) Welsh | ASTEA2 |
| Astragalus aquilonius | Astragalus wootonii Sheldon var. aquilonius Barneby | ASWOA |
| Astragalus aretioides | Astragalus sericoleucus Gray var. aretioides M.E. Jones | ASSEA |
| Astragalus aretioides | Orophaca aretioides (M.E. Jones) Rydb. | ORAR4 |
| Astragalus argophyllus var. argophyllus | Xylophacos argophyllus (Nutt.) Rydb. | XYAR |
| Astragalus argophyllus var. martinii | Astragalus argophyllus Nutt. var. pephragmenoides Barneby | ASARP2 |
| Astragalus argophyllus var. panguicensis | Astragalus panguicensis (M.E. Jones) M.E. Jones | ASPA29 |
| Astragalus argophyllus var. stocksii | Astragalus henrimontanensis Welsh | ASHE6 |
| Astragalus argophyllus var. stocksii | Astragalus stocksii Welsh, non Benth. ex Bunge | ASST8 |
| Astragalus arrectus | Astragalus palousensis Piper | ASPA32 |
| Astragalus atratus var. mensanus | Astragalus mensanus (M.E. Jones) Abrams | ASME7 |
| Astragalus atratus var. owyheensis | Astragalus owyheensis A. Nels. & J.F. Macbr. | ASOW |
| Astragalus atropilosulus ssp. abyssinicus | Astragalus abyssinicus (Hochst.) Steud. ex A. Rich. | ASAB4 |
| Astragalus atropilosulus ssp. abyssinicus | Astragalus venosus (Hochst.) Hochst. ex A. Rich. | ASVE15 |
| Astragalus atropubescens | Astragalus arrectus Gray var. kelseyi (Rydb.) M.E. Jones | ASARK |
| Astragalus australis | Astragalus aboriginorum Richards. | ASAB |
| Astragalus australis | Astragalus aboriginorum Richards. var. fastigiorum M.E. Jones | ASABF |
| Astragalus australis | Astragalus aboriginorum Richards. var. glabriusculus (Hook.) Rydb. | ASABG |
| Astragalus australis | Astragalus aboriginorum Richards. var. lepagei (Hult?n) Boivin | ASABL |
| Astragalus australis | Astragalus aboriginorum Richards. var. richardsonii (Sheldon) Boivin | ASABR |
| Astragalus australis | Astragalus australis (L.) Lam. var. aboriginorum (Richards.) Welsh | ASAUA2 |
| Astragalus australis | Astragalus australis (L.) Lam. var. glabriusculus (Hook.) Isely | ASAUG |
| Astragalus australis | Astragalus australis (L.) Lam. var. lepagei (Hult?n) Welsh | ASAUL |
| Astragalus australis | Astragalus australis (L.) Lam. var. major (Gray) Isely | ASAUM |
| Astragalus australis | Astragalus australis (L.) Lam. var. muriei (Rydb.) Welsh | ASAUM2 |
| Astragalus australis | Astragalus forwoodii S. Wats. | ASFO5 |
| Astragalus australis | Astragalus forwoodii S. Wats. var. wallowensis (Rydb.) M.E. Peck | ASFOW |
| Astragalus australis | Astragalus glabriusculus (Hook.) Gray var. major Gray | ASGLM |
| Astragalus australis | Astragalus linearis (Rydb.) Porsild | ASLI7 |
| Astragalus australis | Astragalus richardsonii Sheldon | ASRI4 |
| Astragalus australis | Astragalus scrupulicola Fern. & Weatherby | ASSC12 |
| Astragalus australis | Atelophragma aboriginorum (Richards.) Rydb. | ATAB |
| Astragalus barrii | Orophaca barrii (Barneby) Isely | ORBA3 |
| Astragalus beckwithii var. weiserensis | Astragalus weiserensis (M.E. Jones) Abrams | ASWE5 |
| Astragalus bisulcatus var. bisulcatus | Astragalus diholcos Tidestrom | ASDI6 |
| Astragalus bisulcatus var. bisulcatus | Diholcos bisulcatus (Hook.) Rydb. | DIBI3 |
| Astragalus bisulcatus var. haydenianus | Astragalus bisulcatus (Hook.) Gray ssp. haydenianus (Gray) W.A. Weber | ASBIH2 |
| Astragalus bisulcatus var. haydenianus | Astragalus haydenianus Gray | ASHA8 |
| Astragalus bisulcatus var. major | Astragalus haylenianus Gray var. major M.E. Jones | ASHAM |
| Astragalus bodinii | Astragalus bodinii Sheldon var. yukonis (M.E. Jones) Boivin | ASBOY |
| Astragalus bodinii | Astragalus stragulus Fern. | ASST11 |
| Astragalus bodinii | Astragalus yukonis M.E. Jones | ASYU2 |
| Astragalus bodinii | Phaca bodinii (Sheldon) Rydb. ex Small | PHBO5 |
| Astragalus calycosus var. calycosus | Astragalus calycosus Torr. ex S. Wats. var. mancus (Rydb.) Barneby | ASCAM |
| Astragalus canadensis var. brevidens | Astragalus brevidens (Gandog.) Rydb. | ASBR13 |
| Astragalus canadensis var. canadensis | Astragalus canadensis L. var. carolinianus (L.) M.E. Jones | ASCAC7 |
| Astragalus canadensis var. canadensis | Astragalus canadensis L. var. longilobus Fassett | ASCAL |
| Astragalus canadensis var. canadensis | Astragalus carolinianus L. | ASCA29 |
| Astragalus canadensis var. canadensis | Astragalus halei Rydb. | ASHA9 |
| Astragalus canadensis var. mortonii | Astragalus mortonii Nutt. | ASMO14 |
| Astragalus captiosus | Astragalus interpositus Boriss. | ASIN26 |
| Astragalus caricinus | Astragalus lyallii Gray var. caricinus M.E. Jones | ASLYC |
| Astragalus castaneiformis | Astragalus castaneiformis S. Wats. var. typicus Barneby | ASCAT |
| Astragalus ceramicus var. filifolius | Astragalus longifolius (Pursh) Rydb. | ASLO11 |
| Astragalus ceramicus var. filifolius | Phaca longifolia (Pursh) Nutt. | PHLO7 |
| Astragalus chamaeleuce var. laccoliticus | Astragalus laccoliticus (M.E. Jones) Welsh | ASLA28 |
| Astragalus clarianus | Astragalus claranus Jepson [orthographic variant] | ASCL |
| Astragalus collinus var. laurentii | Astragalus laurentii (Rydb.) M.E. Peck | ASLA13 |
| Astragalus coltonii var. moabensis | Astragalus canovirens (Rydb.) Barneby | ASCA19 |
| Astragalus conjunctus var. conjunctus | Astragalus diversifolius Gray var. campestris (Nutt.) Dorn | ASDIC2 |
| Astragalus conjunctus var. conjunctus | Astragalus reventus Gray var. conjunctus (S. Wats.) M.E. Jones | ASREC |
| Astragalus conjunctus var. conjunctus | Homalobus campestris Nutt. | HOCA11 |
| Astragalus consobrinus | Astragalus castaneiformis S. Wats. var. consobrinus Barneby | ASCAC |
| Astragalus convallarius var. convallarius | Astragalus junciformis A. Nels. | ASJU4 |
| Astragalus cottonii | Astragalus australis (L.) Lam. var. cottonii (M.E. Jones) Welsh | ASAUC |
| Astragalus cottonii | Astragalus australis (L.) Lam. var. olympicus Isely | ASAUO |
| Astragalus crassicarpus var. berlandieri | Astragalus mexicanus A. DC. | ASME9 |
| Astragalus crassicarpus var. berlandieri | Geoprumnon mexicanum (A. DC.) Rydb. ex Small | GEME |
| Astragalus crassicarpus var. crassicarpus | Astragalus caryocarpus Ker-Gawl. | ASCA28 |
| Astragalus crassicarpus var. crassicarpus | Astragalus succulentus Richards. | ASSU12 |
| Astragalus crassicarpus var. crassicarpus | Geoprumnon crassicarpum (Nutt.) Rydb. ex Small | GECR5 |
| Astragalus crassicarpus var. crassicarpus | Geoprumnon succulentum (Richards.) Rydb. | GESU |
| Astragalus crassicarpus var. trichocalyx | Astragalus mexicanus A. DC. var. trichocalyx (Nutt.) Fern. | ASMET |
| Astragalus crassicarpus var. trichocalyx | Astragalus trichocalyx Nutt. | ASTR18 |
| Astragalus curvicarpus var. brachycodon | Astragalus whitedii Piper var. brachycodon Barneby | ASWHB |
| Astragalus curvicarpus var. subglaber | Astragalus subglaber (Rydb.) M.E. Peck | ASSU13 |
| Astragalus cusickii var. sterilis | Astragalus sterilis Barneby | ASST4 |
| Astragalus cymboides | Astragalus amphioxys Gray var. cymbellus M.E. Jones | ASAMC |
| Astragalus desperatus var. conspectus | Astragalus barnebyi Welsh & Atwood | ASBA3 |
| Astragalus desperatus var. neeseae | Astragalus equisolensis Neese & Welsh | ASEQ |
| Astragalus diaphanus | Astragalus diaphanus Dougl. ex Hook. var. diurnus (S. Wats.) Barneby ex M.E. Peck | ASDID4 |
| Astragalus diaphanus | Astragalus diurnus S. Wats. | ASDI7 |
| Astragalus diaphanus | Astragalus drepanolobus Gray | ASDR4 |
| Astragalus didymocarpus var. didymocarpus | Astragalus catalinensis Nutt. | ASCA26 |
| Astragalus didymocarpus var. didymocarpus | Astragalus didymocarpus Hook. & Arn. var. daleoides Barneby | ASDID5 |
| Astragalus didymocarpus var. dispermus | Astragalus dispermus Gray | ASDI8 |
| Astragalus distortus var. distortus | Holcophacos distortus (Torr. & Gray) Rydb. | HODI3 |
| Astragalus distortus var. engelmannii | Astragalus engelmannii Sheldon | ASEN6 |
| Astragalus douglasii var. douglasii | Astragalus douglasii (Torr. & Gray) Gray var. megalophysus (Rydb.) Munz & McBurney | ASDOM |
| Astragalus douglasii var. parishii | Astragalus parishii Gray | ASPA28 |
| Astragalus douglasii var. perstrictus | Astragalus parishii Gray ssp. perstrictus (Rydb.) Abrams | ASPAP6 |
| Astragalus drummondii | Tium drummondii (Dougl. ex Hook.) Rydb. | TIDR3 |
| Astragalus echinatus | Astragalus pentaglottis L. | ASPE19 |
| Astragalus endopterus | Astragalus wootonii Sheldon var. endopterus Barneby | ASWOE |
| Astragalus ensiformis var. gracilior | Astragalus minthorniae (Rydb.) Jepson var. gracilior (Barneby) Barneby | ASMIG |
| Astragalus episcopus var. episcopus | Astragalus kaibensis M.E. Jones | ASKA2 |
| Astragalus episcopus var. lancearius | Astragalus lancearius Gray | ASLA7 |
| Astragalus eremiticus | Astragalus ampullarioides (Welsh) Welsh | ASAM14 |
| Astragalus eremiticus | Astragalus eremiticus Sheldon var. ampullarioides Welsh | ASERA |
| Astragalus eremiticus | Astragalus eremiticus Sheldon var. malheurensis (Heller) Barneby | ASERM |
| Astragalus eremiticus | Astragalus eremiticus Sheldon var. spencianus M.E. Jones | ASERS2 |
| Astragalus eremiticus | Astragalus malheurensis Heller | ASMA17 |
| Astragalus eucosmus | Astragalus eucosmus B.L. Robins. ssp. sealei (Lepage) Hult | ASEUS |
| Astragalus eucosmus | Astragalus eucosmus B.L. Robins. var. facinorum Fern. | ASEUF |
| Astragalus eucosmus | Astragalus parviflorus (Pursh) MacM. | ASPA33 |
| Astragalus eucosmus | Astragalus sealei Lepage | ASSE13 |
| Astragalus eucosmus | Atelophragma elegans (Hook.) Rydb. | ATEL2 |
| Astragalus eurylobus | Astragalus tephrodes Gray var. eurylobus Barneby | ASTEE |
| Astragalus feensis | Astragalus sanctae-fidei Tidestrom | ASSA16 |
| Astragalus filipes | Astragalus filipes Torr. ex Gray var. residuus Jepson | ASFIR |
| Astragalus filipes | Astragalus macgregorii (Rydb.) Tidestrom | ASMA11 |
| Astragalus filipes | Astragalus stenophyllus Torr. & Gray | ASST9 |
| Astragalus filipes | Astragalus stenophyllus Torr. & Gray var. filipes (Torr. ex Gray) Tidestrom | ASSTF |
| Astragalus flavus | Astragalus confertiflorus Gray | ASCO30 |
| Astragalus flavus | Astragalus confertiflorus Gray var. flaviflorus (Kuntze) M.E. Jones | ASCOF3 |
| Astragalus flavus | Astragalus flavus Nutt. var. argillosus (M.E. Jones) Barneby | ASFLA |
| Astragalus flavus | Astragalus flavus Nutt. var. candicans Gray | ASFLC |
| Astragalus flexuosus var. flexuosus | Astragalus flexuosus (Hook.) Dougl. ex G. Don var. elongatus (Hook.) M.E. Jones | ASFLE |
| Astragalus flexuosus var. flexuosus | Astragalus flexuosus (Hook.) Dougl. ex G. Don var. sierrae-blancae (Rydb.) Barneby | ASFLS |
| Astragalus flexuosus var. flexuosus | Pisophaca flexuosa (Hook.) Rydb. | PIFL8 |
| Astragalus flexuosus var. greenei | Astragalus greenei Gray | ASGR10 |
| Astragalus flexuosus var. greenei | Astragalus stictocarpus (Rydb.) Tidestrom | ASST12 |
| Astragalus gambelianus | Astragalus gambelianus Sheldon ssp. elmeri (Greene) Abrams | ASGAE |
| Astragalus geyeri var. triquetrus | Astragalus triquetrus Gray | ASTR19 |
| Astragalus gilviflorus var. gilviflorus | Astragalus triphyllus Pursh | ASTR12 |
| Astragalus gilviflorus var. gilviflorus | Orophaca triphylla Britt. | ORTR3 |
| Astragalus gilviflorus var. purpureus | Orophaca triphylla Britt. var. purpurea (Dorn) Isely | ORTRP |
| Astragalus gracilis | Microphacos parviflorus Rydb. | MIPA20 |
| Astragalus hallii var. fallax | Astragalus famelicus Sheldon | ASFA7 |
| Astragalus hamiltonii | Astragalus lonchocarpus Torr. var. hamiltonii (C.L. Porter) Isely | ASLOH |
| Astragalus hoodianus | Astragalus conjunctus S. Wats. var. oxytropidoides M.E. Jones | ASCOO |
| Astragalus hoodianus | Astragalus reventus Gray var. oxytropidoides (M.E. Jones) C.L. Hitchc. | ASREO |
| Astragalus hoodianus | Cnemidophacos knowlesianus Rydb. | CNKN |
| Astragalus hornii | Astragalus hornii Gray var. hornii Gray [superfluous autonym] | ASHOH |
| Astragalus humistratus var. humistratus | Astragalus datilensis (Rydb.) Tidestrom | ASDA4 |
| Astragalus hyalinus | Orophaca hyalina (M.E. Jones) Isely | ORHY2 |
| Astragalus incanus ssp. macrorhizus | Astragalus macrorhizus Cav. | ASMA22 |
| Astragalus insularis var. harwoodii | Astragalus harwoodii (Munz & McBurney) Abrams | ASHA11 |
| Astragalus iodanthus var. diaphanoides | Astragalus iodanthus S. Wats. var. vipereus Barneby | ASIOV |
| Astragalus kentrophyta var. coloradoensis | Astragalus kentrophyta Gray ssp. coloradoensis (M.E. Jones) W.A. Weber | ASKEC2 |
| Astragalus kentrophyta var. danaus | Astragalus kentrophyta Gray ssp. danaus (Barneby) W.A. Weber | ASKED3 |
| Astragalus kentrophyta var. douglasii | Astragalus kentrophyta Gray ssp. douglasii (Barneby) W.A. Weber | ASKED4 |
| Astragalus kentrophyta var. elatus | Astragalus impensis (Rydb.) Woot. & Standl. | ASIM |
| Astragalus kentrophyta var. elatus | Astragalus kentrophyta Gray ssp. elatus (S. Wats.) W.A. Weber | ASKEE2 |
| Astragalus kentrophyta var. jessiae | Astragalus jessiae M.E. Peck | ASJE3 |
| Astragalus kentrophyta var. jessiae | Astragalus kentrophyta Gray ssp. jessiae (M.E. Peck) W.A. Weber | ASKEJ2 |
| Astragalus kentrophyta var. kentrophyta | Astragalus viridis (Nutt.) Sheldon | ASVI12 |
| Astragalus kentrophyta var. kentrophyta | Kentrophyta montana Nutt. | KEMO |
| Astragalus kentrophyta var. neomexicanus | Astragalus kentrophyta Gray ssp. neomexicanus (Barneby) W.A. Weber | ASKEN2 |
| Astragalus kentrophyta var. tegetarius | Astragalus kentrophyta Gray ssp. implexus (Canby ex Porter & Coult.) W.A. Weber | ASKEI2 |
| Astragalus kentrophyta var. tegetarius | Astragalus kentrophyta Gray var. implexus (Canby ex Porter & Coult.) Barneby | ASKEI |
| Astragalus kentrophyta var. tegetarius | Astragalus tegetarius S. Wats. | ASTE14 |
| Astragalus kentrophyta var. ungulatus | Astragalus kentrophyta Gray ssp. ungulatus (M.E. Jones) W.A. Weber | ASKEU2 |
| Astragalus laxmannii var. robustior | Astragalus adsurgens Pall. | ASAD11 |
| Astragalus laxmannii var. robustior | Astragalus adsurgens Pallas ssp. robustior (Hook.) Welsh | ASADR2 |
| Astragalus laxmannii var. robustior | Astragalus adsurgens Pallas var. robustior Hook. | ASADR |
| Astragalus laxmannii var. robustior | Astragalus striatus Nutt. | ASST82 |
| Astragalus laxmannii var. robustior | Astragalus sulphurescens Rydb. | ASSU11 |
| Astragalus laxmannii var. tananaicus | Astragalus adsurgens Pallas ssp. viciifolius (Hult?n) Welsh | ASADV |
| Astragalus laxmannii var. tananaicus | Astragalus adsurgens Pallas var. tananaicus (Hult?n) Barneby | ASADT |
| Astragalus leibergii | Astragalus arrectus Gray var. leibergii (M.E. Jones) M.E. Jones | ASARL |
| Astragalus lentiginosus var. albifolius | Astragalus albifolius (M.E. Jones) Abrams | ASAL11 |
| Astragalus lentiginosus var. borreganus | Astragalus agninus Jepson | ASAG3 |
| Astragalus lentiginosus var. borreganus | Astragalus arthu-schottii Gray | ASAR11 |
| Astragalus lentiginosus var. borreganus | Astragalus coulteri Benth. | ASCO33 |
| Astragalus lentiginosus var. borreganus | Astragalus lentiginosus Dougl. ex Hook. var. coulteri (Benth.) M.E. Jones | ASLEC4 |
| Astragalus lentiginosus var. chartaceus | Astragalus lentiginosus Dougl. ex Hook. var. platyphyllidius (Rydb.) M.E. Peck | ASLEP2 |
| Astragalus lentiginosus var. diphysus | Astragalus araneosus Sheldon | ASAR12 |
| Astragalus lentiginosus var. diphysus | Astragalus diphysus Gray | ASDI18 |
| Astragalus lentiginosus var. diphysus | Astragalus lentiginosus Dougl. ex Hook. var. albiflorus (Gray) Schoener | ASLEA6 |
| Astragalus lentiginosus var. diphysus | Astragalus lentiginosus Dougl. ex Hook. var. araneosus (Sheldon) Barneby | ASLEA4 |
| Astragalus lentiginosus var. diphysus | Astragalus lentiginosus Dougl. ex Hook. var. mcdougallii (Sheldon) M.E. Jones | ASLEM4 |
| Astragalus lentiginosus var. diphysus | Astragalus lentiginosus Dougl. ex Hook. var. wahweapensis Welsh | ASLEW2 |
| Astragalus lentiginosus var. fremontii | Astragalus fremontii Gray ex Torr. | ASFR3 |
| Astragalus lentiginosus var. fremontii | Astragalus fremontii Gray ex Torr. ssp. eremicus (Sheldon) Abrams | ASFRE |
| Astragalus lentiginosus var. idriensis | Astragalus idriensis (M.E. Jones) Abrams | ASID |
| Astragalus lentiginosus var. idriensis | Astragalus tehatchapiensis (Rydb.) Tidestrom | ASTE15 |
| Astragalus lentiginosus var. ineptus | Astragalus ineptus Gray | ASIN24 |
| Astragalus lentiginosus var. kernensis | Astragalus lentiginosus Dougl. ex Hook. var. charlestonensis (Clokey) Barneby | ASLEC7 |
| Astragalus lentiginosus var. lentiginosus | Astragalus lentiginosus Dougl. ex Hook. var. carinatus M.E. Jones | ASLEC6 |
| Astragalus lentiginosus var. nigricalycis | Astragalus nigricalycis (M.E. Jones) Abrams | ASNI4 |
| Astragalus lentiginosus var. palans | Astragalus bryantii Barneby | ASBR9 |
| Astragalus lentiginosus var. palans | Astragalus lentiginosus Dougl. ex Hook. var. ursinus (Gray) Barneby | ASLEU |
| Astragalus lentiginosus var. pohlii | Astragalus lentiginosus Dougl. ex Hook. var. pohilii Welsh & Barneby [orthographic error] | ASLEP4 |
| Astragalus lentiginosus var. salinus | Astragalus lentiginosus Dougl. ex Hook. var. macrolobus (Rydb.) Barneby | ASLEM |
| Astragalus lentiginosus var. salinus | Astragalus salinus T.J. Howell | ASSA17 |
| Astragalus lentiginosus var. scorpionis | Astragalus lentiginosus Dougl. ex Hook. var. toiyabensis Barneby | ASLET2 |
| Astragalus lentiginosus var. scorpionis | Astragalus lentiginosus Dougl. ex Hook. var. tremuletorum Barneby | ASLET3 |
| Astragalus limnocharis var. montii | Astragalus limnocharis Barneby var. tabulaeus Welsh | ASLIT |
| Astragalus limnocharis var. montii | Astragalus montii Welsh | ASMO11 |
| Astragalus loanus | Astragalus newberryi Gray var. wardianus Barneby | ASNEW |
| Astragalus lotiflorus | Astragalus elatiocarpus Sheldon | ASEL14 |
| Astragalus lotiflorus | Astragalus lotiflorus Hook. var. nebraskensis Bates | ASLON |
| Astragalus lotiflorus | Astragalus lotiflorus Hook. var. reverchonii (Gray) M.E. Jones | ASLOR |
| Astragalus lotiflorus | Astragalus reverchoni Gray | ASRE15 |
| Astragalus lotiflorus | Batidophaca lotiflorus (Hook.) Rydb. | BALO |
| Astragalus lurorum | Astragalus luristanicus Bornm., nom. illeg. [anomalous] | ASLU6 |
| Astragalus magdalenae var. niveus | Astragalus niveus Rydb. [excluded] | ASNI8 |
| Astragalus magdalenae var. peirsonii | Astragalus peirsonii Munz & McBurney | ASPE11 |
| Astragalus megacarpus | Astragalus megacarpus (Nutt.) Gray var. parryi Gray ex S. Wats. | ASMEP |
| Astragalus michauxii | Tium michauxii (Kuntze) Rydb. | TIMI3 |
| Astragalus misellus var. misellus | Astragalus howellii Gray var. aberrans (M.E. Jones) C.L. Hitchc. | ASHOA |
| Astragalus misellus var. pauper | Astragalus howellii Gray var. pauper (Barneby) Isely | ASHOP |
| Astragalus miser var. crispatus | Astragalus decumbens (Nutt. ex Torr. & Gray) Gray var. crispatus (M.E. Jones) Cronq. & Barneby | ASDEC2 |
| Astragalus miser var. decumbens | Astragalus decumbens (Nutt. ex Torr. & Gray) Gray | ASDE13 |
| Astragalus miser var. miser | Astragalus strigosus Coult. & Fisher | ASST10 |
| Astragalus miser var. oblongifolius | Astragalus decumbens (Nutt. ex Torr. & Gray) Gray var. oblongifolius (Rydb.) Cronq. | ASDEO |
| Astragalus miser var. serotinus | Astragalus decumbens (Nutt. ex Torr. & Gray) Gray var. serotinus (Gray ex Cooper) M.E. Jones | ASDES |
| Astragalus miser var. serotinus | Astragalus serotinus Gray ex Cooper | ASSE14 |
| Astragalus missouriensis var. missouriensis | Xylophacos missouriensis (Nutt.) Rydb. | XYMI |
| Astragalus mokiacensis | Astragalus lentiginosus Dougl. ex Hook. var. mokiacensis (Gray) M.E. Jones | ASLEM5 |
| Astragalus mollissimus var. bigelovii | Astragalus bigelovii Gray | ASBI8 |
| Astragalus mollissimus var. bigelovii | Astragalus bigelovii Gray var. typicus Barneby | ASBIT |
| Astragalus mollissimus var. earlei | Astragalus earlei Greene | ASEA4 |
| Astragalus mollissimus var. marcidus | Astragalus bigelovii Gray var. marcidus (Greene ex Rydb.) Isely | ASBIM2 |
| Astragalus mollissimus var. matthewsii | Astragalus bigelovii Gray var. matthewsii (S. Wats.) M.E. Jones | ASBIM4 |
| Astragalus mollissimus var. matthewsii | Astragalus matthewsii S. Wats. | ASMA13 |
| Astragalus mollissimus var. mogollonicus | Astragalus bigelovii Gray var. mogollonicus (Greene) Barneby | ASBIM3 |
| Astragalus mollissimus var. thompsoniae | Astragalus bigelovii Gray var. thompsoniae (S. Wats.) M.E. Jones | ASBIT2 |
| Astragalus mollissimus var. thompsoniae | Astragalus thompsoniae S. Wats. | ASTH2 |
| Astragalus molybdenus | Astragalus molybdenus Barneby var. shultziorum (Barneby) Welsh | ASMOS |
| Astragalus molybdenus | Astragalus plumbeus Barneby | ASPL9 |
| Astragalus molybdenus | Astragalus shultziorum Barneby | ASSH7 |
| Astragalus monumentalis var. cottamii | Astragalus cottamii Welsh | ASCO18 |
| Astragalus neglectus | Astragalus cooperi Gray | ASCO32 |
| Astragalus neglectus | Phaca neglecta Torr. & Gray | PHNE8 |
| Astragalus nelsonianus | Astragalus pectinatus (Dougl. ex Hook.) Dougl. ex G. Don var. platyphyllus M.E. Jones | ASPEP |
| Astragalus newberryi var. blyae | Astragalus blyae (Rose ex Rydb.) Tidestrom | ASBL3 |
| Astragalus nutans | Astragalus chuckwallae Abrams | ASCH9 |
| Astragalus nuttallianus | Hamosa leptocarpa Rydb. | HALE8 |
| Astragalus nuttallianus var. austrinus | Astragalus austrinus (Small) E.D. Schulz | ASAU6 |
| Astragalus nuttallii var. nuttallii | Astragalus menziesii Gray | ASME8 |
| Astragalus nuttallii var. virgatus | Astragalus menziesii Gray ssp. virgatus (Gray ex Brewer & S. Wats.) Abrams | ASMEV |
| Astragalus obcordatus | Phaca obcordata (Ell.) Rydb. ex Small | PHOB2 |
| Astragalus palmeri | Astragalus vaseyi S. Wats. | ASVA5 |
| Astragalus palmeri | Astragalus vaseyi S. Wats. var. johnstonii Munz & McBurney | ASVAJ |
| Astragalus palmeri | Astragalus vaseyi S. Wats. var. metanus (M.E. Jones) Munz & McBurney | ASVAM |
| Astragalus pauperculus | Astragalus bruceae (M.E. Jones) Abrams | ASBR14 |
| Astragalus pectinatus | Cnemidophacos pectinatus (Dougl. ex Hook.) Rydb. | CNPE |
| Astragalus pinonis var. atwoodii | Astragalus atwoodii Welsh & Thorne | ASAT4 |
| Astragalus piutensis | Astragalus marianus (Rydb.) Barneby, non Huber | ASMA9 |
| Astragalus plattensis | Astragalus pachycarpus Torr. & Gray | ASPA31 |
| Astragalus plattensis | Geoprumnon plattense (Nutt.) Rydb. | GEPL3 |
| Astragalus pleianthus | Astragalus nuttallianus DC. var. pleianthus (Shinners) Barneby | ASNUP |
| Astragalus polaris | Astragalus amblyodon (Rydb.) Hult | ASAM8 |
| Astragalus polybotrys | Astragalus recollectus Rech. f. | ASRE13 |
| Astragalus praelongus var. praelongus | Astragalus pattersonii Gray ex Brandeg. var. praelongus (Sheldon) M.E. Jones | ASPAP7 |
| Astragalus praelongus var. praelongus | Astragalus recedens (Greene ex Rydb.) C.L. Porter | ASRE11 |
| Astragalus preussii var. cutleri | Astragalus cutleri (Barneby) Welsh | ASCU16 |
| Astragalus preussii var. laxiflorus | Astragalus crotalariae (Benth.) Gray var. davidsonii (Rydb.) Munz & McBurney | ASCRD3 |
| Astragalus preussii var. preussii | Astragalus preussii Gray var. latus M.E. Jones | ASPRL3 |
| Astragalus proimanthus | Orophaca proimantha (Barneby) Isely | ORPR2 |
| Astragalus pseudiodanthus | Astragalus iodanthus S. Wats. var. pseudiodanthus (Barneby) Isely | ASIOP |
| Astragalus pubentissimus | Astragalus peabodianus M.E. Jones | ASPE12 |
| Astragalus pubentissimus | Astragalus pubentissimus Torr. & Gray var. peabodianus (M.E. Jones) Welsh | ASPUP2 |
| Astragalus purshii var. glareosus | Astragalus glareosus Dougl. ex Hook. | ASGL7 |
| Astragalus purshii var. glareosus | Astragalus ventosus Suksdorf ex Rydb. | ASVE10 |
| Astragalus purshii var. lagopinus | Astragalus lagopinus (Rydb.) M.E. Peck | ASLA14 |
| Astragalus purshii var. lectulus | Astragalus jonesii Abrams | ASJO4 |
| Astragalus purshii var. lectulus | Astragalus lectulus S. Wats. | ASLE15 |
| Astragalus purshii var. ophiogenes | Astragalus ophiogenes Barneby | ASOP |
| Astragalus purshii var. purshii | Astragalus incurvus (Rydb.) Abrams | ASIN25 |
| Astragalus purshii var. purshii | Astragalus purshii Dougl. ex Hook. var. interior M.E. Jones | ASPUI |
| Astragalus purshii var. tinctus | Astragalus candelarius Sheldon | ASCA27 |
| Astragalus purshii var. tinctus | Astragalus leucolobus S. Wats. ex M.E. Jones ssp. consectus (Sheldon) Abrams | ASLEC5 |
| Astragalus purshii var. tinctus | Astragalus purshii Dougl. ex Hook. var. longilobus M.E. Jones | ASPUL3 |
| Astragalus ravenii | Astragalus monoensis Barneby var. ravenii (Barneby) Isely | ASMOR |
| Astragalus reventiformis | Astragalus reventus Gray var. canbyi M.E. Jones | ASREC2 |
| Astragalus robbinsii var. alpiniformis | Astragalus alpinus L. var. alpiniformis (Rydb.) Rydb. ex M.E. Peck | ASALA6 |
| Astragalus robbinsii var. alpiniformis | Atelophragma alpiniforme Rydb. | ATAL3 |
| Astragalus robbinsii var. harringtonii | Astragalus harringtonii (Rydb.) Coville & Standl. ex Hult | ASHA10 |
| Astragalus robbinsii var. harringtonii | Astragalus robbinsii (Oakes) Gray ssp. harringtonii (Rydb.) Hult | ASROH2 |
| Astragalus robbinsii var. harringtonii | Atelophragma harringtonii Rydb. | ATHA2 |
| Astragalus robbinsii var. jesupii | Astragalus jesupii (Egglest. & Sheldon) Britt. | ASJE4 |
| Astragalus robbinsii var. minor | Astragalus blakei Egglest. | ASBL4 |
| Astragalus robbinsii var. minor | Astragalus collieri (Rydb.) Porsild | ASCO31 |
| Astragalus robbinsii var. minor | Astragalus macounii Rydb. | ASMA12 |
| Astragalus robbinsii var. minor | Astragalus robbinsii (Oakes) Gray var. blakei (Egglest.) Barneby | ASROB |
| Astragalus robbinsii var. occidentalis | Astragalus occidentalis (S. Wats.) M.E. Jones | ASOC3 |
| Astragalus sepultipes | Astragalus andersonii Gray var. sepultipes Barneby | ASANS2 |
| Astragalus serenoi var. shockleyi | Astragalus shockleyi M.E. Jones | ASSH8 |
| Astragalus sericoleucus | Astragalus sericea auct. non DC. [misapplied] | ASSE15 |
| Astragalus sericoleucus | Orophaca sericea auct. non (Nutt.) Britt. [misapplied] | ORSE2 |
| Astragalus sesquiflorus | Astragalus sesquiflorus S. Wats. var. brevipes Barneby | ASSEB |
| Astragalus sheldonii | Astragalus conjunctus S. Wats. var. sheldonii (Rydb.) M.E. Peck | ASCOS4 |
| Astragalus sheldonii | Astragalus reventus Gray var. sheldonii (Rydb.) C.L. Hitchc. | ASRES |
| Astragalus sinuatus | Astragalus whitedii Piper | ASWH3 |
| Astragalus spatulatus | Astragalus caespitosus (Nutt.) Gray | ASCA13 |
| Astragalus spatulatus | Astragalus spatulatus Sheldon var. uniflorus (Rydb.) Barneby | ASSPU |
| Astragalus spatulatus | Homalobus caespitosus Nutt. | HOCA7 |
| Astragalus spatulatus | Orophaca caespitosa (Nutt.) Britt. | ORCA7 |
| Astragalus subcinereus | Astragalus silerianus M.E. Jones | ASSI11 |
| Astragalus subcinereus | Astragalus silerianus M.E. Jones var. cariacus M.E. Jones | ASSIC |
| Astragalus subcinereus | Astragalus subcinereus Gray var. basalticus Welsh | ASSUB |
| Astragalus subcinereus | Astragalus subcinereus Gray var. silerianus (M.E. Jones) Welsh | ASSUS4 |
| Astragalus tenellus | Astragalus tenellus Pursh var. strigulosus (Rydb.) F.J. Herm. | ASTES |
| Astragalus tenellus | Homalobus tenellus (Pursh) Britt. | HOTE5 |
| Astragalus tennesseensis | Geoprumnon tennesseense (Gray ex Chapman) Rydb. | GETE7 |
| Astragalus tephrodes var. brachylobus | Astragalus arrectus Gray var. pephragmenus (M.E. Jones) M.E. Jones | ASARP3 |
| Astragalus tephrodes var. tephrodes | Astragalus tephrodes Gray var. typicus Barneby | ASTET4 |
| Astragalus tetrapterus | Astragalus cinerascens (Rydb.) Tidestrom | ASCI7 |
| Astragalus tetrapterus | Astragalus tetrapterus Gray var. capricornus M.E. Jones | ASTEC2 |
| Astragalus tetrapterus | Astragalus tetrapterus Gray var. cinerascens (Rydb.) Barneby | ASTEC3 |
| Astragalus titanophilus | Astragalus convallarius Greene var. foliolatus Barneby | ASCOF4 |
| Astragalus trichopodus var. lonchus | Astragalus leucopsis (Torr. & Gray) Torr. & Gray | ASLE16 |
| Astragalus trichopodus var. lonchus | Astragalus trichopodus (Nutt.) Gray ssp. leucopsis (Torr. & Gray) Thorne | ASTRL2 |
| Astragalus trichopodus var. phoxus | Astragalus antisellii Gray ex Brewer & S. Wats. | ASAN8 |
| Astragalus trichopodus var. phoxus | Astragalus gaviotus Elmer | ASGA6 |
| Astragalus trichopodus var. phoxus | Astragalus trichopodus (Nutt.) Gray ssp. antisellii (Gray ex Brewer & S. Wats.) Thorne | ASTRA3 |
| Astragalus trichopodus var. trichopodus | Astragalus trichopodus (Nutt.) Gray var. capillipes (M.E. Jones) M.E. Jones | ASTRC |
| Astragalus tridactylicus | Astragalus sericoleucus Gray var. tridactylicus (Gray) M.E. Jones | ASSET |
| Astragalus tridactylicus | Orophaca tridactylica (Gray) Rydb. | ORTR2 |
| Astragalus tyghensis | Astragalus spaldingii Gray var. tyghensis (M.E. Peck) C.L. Hitchc. | ASSPT |
| Astragalus umbellatus | Astragalus frigidus (L.) Gray p.p. | ASFR4 |
| Astragalus vaginatus | Astragalus semibilocularis DC. | ASSE19 |
| Astragalus vexilliflexus var. vexilliflexus | Homalobus vexilliflexus (Sheldon) Rydb. | HOVE2 |
| Astragalus villosus | Phaca intonsa (Sheldon) Rydb. ex Small | PHIN14 |
| Astragalus whitneyi var. siskiyouensis | Astragalus whitneyi Gray ssp. siskiyouensis (Rydb.) Abrams | ASWHS3 |
| Astragalus whitneyi var. sonneanus | Astragalus whitneyi Gray ssp. hookerianus (Torr. & Gray) Abrams | ASWHH |
| Astragalus whitneyi var. whitneyi | Astragalus whitneyi Gray ssp. pinosus (Elmer) Abrams | ASWHP |
| Astragalus xiphoides | Astragalus convallarius Greene var. xiphoides Barneby | ASCOX |
| Atlantic pigeonwings | Clitoria mariana L. | CLMA4 |
| Austin's milkvetch | Astragalus austiniae Gray ex Brewer & S. Wats. | ASAU |
| Australian indigo | Indigofera australis Willd. | INAU2 |
| Australian joint-vetch | Aeschynomene falcata (Poir.) DC. | AEFA2 |
| Australian senna | Senna nemophila (A. Cunningham), comb. nov. ined. | SENE11 |
| avaram | Cassia auriculata L. | CAAU19 |
| Avon Park rattlebox | Crotalaria avonensis K.R. DeLaney & Wunderlin | CRAV |
| awl-leaf wattle | Acacia subulata Bonpl. | ACSU10 |
| Aztec clover | Trifolium amabile Kunth | TRAM2 |
| Aztec milkvetch | Astragalus proximus (Rydb.) Woot. & Standl. | ASPR8 |
| babybonnets | Coursetia DC. | COURS |
| bagpod | Sesbania vesicaria (Jacq.) Ell. | SEVE |
| Bahama baybean | Canavalia nitida (Cav.) Piper | CANI7 |
| bajada lupine | Lupinus concinnus J.G. Agardh | LUCO |
| bajada lupine | Lupinus concinnus J.G. Agardh ssp. concinnus | LUCOC |
| bajada lupine | Lupinus concinnus J.G. Agardh ssp. optatus (C.P. Sm.) D. Dunn | LUCOO |
| Baker's lupine | Lupinus bakeri Greene | LUBA3 |
| Baker's lupine | Lupinus bakeri Greene ssp. amplus (Greene) Fleak & D. Dunn | LUBAA |
| Baker's lupine | Lupinus bakeri Greene ssp. bakeri | LUBAB |
| Balansa clover | Trifolium michelianum Savi ssp. balansae (Boiss.) Ponert | TRMIB2 |
| Bald Mountain milkvetch | Astragalus umbraticus Sheldon | ASUM3 |
| balloon sack clover | Trifolium depauperatum Desv. var. amplectens (Torr. & Gray) S. Wats. | TRDEA |
| balloon sack clover | Trifolium depauperatum Desv. var. diversifolium (Nutt.) McDermott | TRDED2 |
| balloon sack clover | Trifolium depauperatum Desv. var. stenophyllum (Nutt.) McDermott | TRDES |
| balloonpod milkvetch | Astragalus whitneyi Gray | ASWH |
| balloonpod milkvetch | Astragalus whitneyi Gray var. lenophyllus (Rydb.) Barneby | ASWHL |
| balloonpod milkvetch | Astragalus whitneyi Gray var. sonneanus (Greene) Jepson | ASWHS2 |
| balloonpod milkvetch | Astragalus whitneyi Gray var. whitneyi | ASWHW |
| balsam bird's-foot trefoil | Lotus stipularis (Benth.) Greene | LOST3 |
| balsam bird's-foot trefoil | Lotus stipularis (Benth.) Greene var. stipularis | LOSTS |
| balsam of Peru | Myroxylon balsamum (L.) Harms var. pereirae (Royle) Harms | MYBAP |
| balsam of Tolu | Myroxylon balsamum (L.) Harms | MYBA3 |
| balsam of Tolu | Myroxylon balsamum (L.) Harms var. balsamum | MYBAB |
| balsam tree | Colophospermum mopane (Kirk ex Benth.) Kirk ex J. L?onard | COMO14 |
| bambarra groundnut | Vigna subterranea (L.) Verdc. | VISU7 |
| bank catclaw | Acacia redolens Maslin | ACRE9 |
| baphia | Baphia Lodd. | BAPHI |
| Baptisia ?bushii | Baptisia ?intermedia Larisey | BAIN4 |
| Baptisia ?bushii | Baptisia ?stricta Larisey | BAST2 |
| Baptisia ?serenae | Baptisia ?deamii Larisey | BADE3 |
| Baptisia ?serenae | Baptisia ?pinetorum Larisey | BAPI2 |
| Baptisia ?sulphurea | Baptisia fragilis Larisey | BAFR2 |
| Baptisia ?sulphurea | Baptisia macilenta Small ex Larisey | BAMA7 |
| Baptisia alba var. alba | Baptisia lactea (Raf.) Thieret var. obovata (Larisey) Isely | BALAO |
| Baptisia alba var. alba | Baptisia pendula Larisey | BAPE4 |
| Baptisia alba var. alba | Baptisia pendula Larisey var. obovata Larisey | BAPEO |
| Baptisia alba var. alba | Baptisia psammophila Larisey | BAPS |
| Baptisia alba var. alba | Crotalaria alba L. | CRAL6 |
| Baptisia alba var. macrophylla | Baptisia lactea (Raf.) Thieret | BALA2 |
| Baptisia alba var. macrophylla | Baptisia leucantha Torr. & Gray | BALE2 |
| Baptisia alba var. macrophylla | Baptisia leucantha Torr. & Gray var. divaricata Larisey | BALED |
| Baptisia alba var. macrophylla | Baptisia leucantha Torr. & Gray var. pauciflora Larisey | BALEP |
| Baptisia alba var. macrophylla | Baptisia pendula Larisey var. macrophylla Larisey | BAPEM |
| Baptisia australis var. aberrans | Baptisia minor Lehm. var. aberrans Larisey | BAMIA |
| Baptisia australis var. minor | Baptisia minor Lehm. | BAMI4 |
| Baptisia australis var. minor | Baptisia texana Buckl. | BATE4 |
| Baptisia australis var. minor | Baptisia vespertina Small ex Rydb. | BAVE4 |
| Baptisia bracteata var. bracteata | Baptisia intercalata Larisey | BAIN3 |
| Baptisia bracteata var. laevicaulis | Baptisia bushii auct. non Small [misapplied] | BABU2 |
| Baptisia bracteata var. laevicaulis | Baptisia cuneata Small | BACU |
| Baptisia bracteata var. laevicaulis | Baptisia laevicaulis (Gray ex Canby) Small | BALA |
| Baptisia bracteata var. laevicaulis | Baptisia leucophaea Nutt. var. laevicaulis Gray ex Canby | BALEL |
| Baptisia bracteata var. leucophaea | Baptisia bracteata Muhl. ex Ell. var. glabrescens (Larisey) Isely | BABRG |
| Baptisia bracteata var. leucophaea | Baptisia leucophaea Nutt. | BALE3 |
| Baptisia bracteata var. leucophaea | Baptisia leucophaea Nutt. var. glabrescens Larisey | BALEG |
| Baptisia calycosa var. villosa | Baptisia hirsuta Small | BAHI4 |
| Baptisia cinerea | Baptisia villosa auct. non (Walt.) Nutt. [misapplied] | BAVI7 |
| Baptisia lanceolata var. tomentosa | Baptisia elliptica Small | BAEL |
| Baptisia lanceolata var. tomentosa | Baptisia elliptica Small var. tomentosa Larisey | BAELT |
| Baptisia megacarpa | Baptisia riparia Larisey | BARI |
| Baptisia megacarpa | Baptisia riparia Larisey var. minima Larisey | BARIM |
| Baptisia sphaerocarpa | Baptisia viridis Larisey | BAVI2 |
| Baptisia tinctoria | Baptisia gibbesii Small | BAGI |
| Baptisia tinctoria | Baptisia tinctoria (L.) R. Br. ex Ait. f. var. crebra Fern. | BATIC |
| Baptisia tinctoria | Baptisia tinctoria (L.) R. Br. ex Ait. f. var. projecta Fern. | BATIP |
| barbasco | Lonchocarpus nicou (Aublet) DC. | LONI3 |
| barbasco | Lonchocarpus urucu Killip & A. C. Smith | LOUR |
| barbieria | Barbieria DC. | BARBI |
| Barbieria pinnata | Clitoria pinnata (Pers.) R.H. Sm. | CLPI5 |
| Barbieria pinnata | Clitoria polyphylla Poir. | CLPO2 |
| barn vetch | Vicia monantha Retz. | VIMO80 |
| Barneby's clover | Trifolium barnebyi (Isely) Dorn & Lichvar | TRBA5 |
| Barneby's locoweed | Oxytropis arctica R. Br. var. barnebyana Welsh | OXARB |
| Barr's milkvetch | Astragalus barrii Barneby | ASBA |
| barrelclover | Medicago truncatula Gaertner | METR10 |
| barren milkvetch | Astragalus cusickii Gray var. sterilis (Barneby) Barneby | ASCUS2 |
| Barrier Range wattle | Acacia beckleri Tindale | ACBE6 |
| barwood | Pterocarpus erinaceus Poiret | PTER |
| barwood | Pterocarpus soyauxii Taubert | PTSO |
| basalt milkvetch | Astragalus filipes Torr. ex Gray | ASFI |
| bastard draba milkvetch | Astragalus drabelliformis Barneby | ASDR2 |
| bastard milkvetch | Astragalus tegetarioides M.E. Jones | ASTE4 |
| bastard mulga | Acacia stowardii Maiden | ACST8 |
| bauhinia | Bauhinia fassoglensis Kotschy ex Schweinf. | BAFA |
| bauhinia | Bauhinia L. | BAUHI |
| Bauhinia fassoglensis | Tylosema fassoglense (Schweinf.) Torre & Hillc. | TYFA2 |
| Bauhinia galpinii | Bauhinia punctata Bolle, non Jacq. | BAPU80 |
| Bauhinia lunarioides | Bauhinia congesta (Britt. & Rose) Lundell | BACO |
| Bauhinia lunarioides | Bauhinia jermyana (Britt.) Lundell | BAJE |
| Bauhinia lunarioides | Casparea congesta Britt. & Rose | CACO54 |
| Bauhinia lunarioides | Casparea jermyana Britt. | CAJE3 |
| Bauhinia macrantha | Bauhinia macrantha Benth. ex Hemsl. var. grayana Wunderlin [excluded] | BAMAG |
| Bauhinia monandra | Caspareopsis monandra (Kurz) Britt. & Rose | CAMO17 |
| Bauhinia multinervia | Bauhinia megalandra Griseb. | BAME2 |
| Bauhinia petersiana ssp. macrantha | Bauhinia petersiana Bolle ssp. serpae (Ficalho & Hiern) Brummitt & J. H. Ross | BAPES |
| baybean | Canavalia rosea (Sw.) DC. | CARO26 |
| beach pea | Lathyrus japonicus Willd. | LAJA |
| beach pea | Lathyrus japonicus Willd. var. japonicus | LAJAJ |
| beach pea | Lathyrus japonicus Willd. var. maritimus (L.) Kartesz & Gandhi | LAJAM |
| beach pea | Lathyrus japonicus Willd. var. pellitus Fern. | LAJAP2 |
| beach sensitive pea | Chamaecrista chamaecristoides (Colladon) Greene | CHCH3 |
| beach sensitive pea | Chamaecrista chamaecristoides (Colladon) Greene var. cruziana (Britt. & Rose) Irwin & Barneby | CHCHC |
| beadtree | Adenanthera L. | ADENA |
| bean | Phaseolus L. | PHASE |
| Bear Valley milkvetch | Astragalus leucolobus S. Wats. ex M.E. Jones | ASLE11 |
| bearded clover | Trifolium barbigerum Torr. | TRBA |
| bearded clover | Trifolium barbigerum Torr. var. barbigerum | TRBAB |
| bearded lupine | Lupinus barbiger S. Wats. | LUBA |
| bearded milkvetch | Astragalus villosus Michx. | ASVI6 |
| bearded prairie clover | Dalea pogonathera Gray | DAPO |
| bearded prairie clover | Dalea pogonathera Gray var. pogonathera | DAPOP |
| Beath's milkvetch | Astragalus beathii C.L. Porter | ASBE2 |
| Beatley's clover | Trifolium andersonii Gray ssp. beatleyae J. Gillett | TRANB |
| Beatley's milkvetch | Astragalus beatleyae Barneby | ASBE5 |
| beaver Indian breadroot | Pediomelum castoreum (S. Wats.) Rydb. | PECA24 |
| Beckwith's clover | Trifolium beckwithii Brewer ex S. Wats. | TRBE2 |
| Beckwith's milkvetch | Astragalus beckwithii Torr. & Gray | ASBE3 |
| Beckwith's milkvetch | Astragalus beckwithii Torr. & Gray var. beckwithii | ASBEB |
| Beckwith's milkvetch | Astragalus beckwithii Torr. & Gray var. purpureus M.E. Jones | ASBEP |
| Beckwith's milkvetch | Astragalus beckwithii Torr. & Gray var. sulcatus Barneby | ASBES |
| bee wattle | Acacia sphaerocephala Schlecht. & Cham. | ACSP4 |
| Beirut clover | Trifolium berytheum Boiss. & Blanche | TRBE5 |
| Bejar clover | Trifolium bejariense Moric. | TRBE3 |
| bejuco de alambre | Neorudolphia volubilis (Willd.) Britt. | NEVO |
| bejuco de mato | Dioclea hexandra (Ralph) Mabberley | DIHE2 |
| Bengal kino | Butea monosperma (Lam.) Taubert | BUMO5 |
| bent milkvetch | Astragalus inflexus Dougl. ex Hook. | ASIN5 |
| bentflower milkvetch | Astragalus vexilliflexus Sheldon | ASVE5 |
| bentflower milkvetch | Astragalus vexilliflexus Sheldon var. vexilliflexus | ASVEV2 |
| Bentham's broom | Lotus benthamii Greene | LOBE2 |
| Berteron's rattlebox | Crotalaria berteriana DC. | CRBE8 |
| Bessey's locoweed | Oxytropis besseyi (Rydb.) Blank. | OXBE2 |
| Bessey's locoweed | Oxytropis besseyi (Rydb.) Blank. var. besseyi | OXBEB |
| Bessey's locoweed | Oxytropis besseyi (Rydb.) Blank. var. fallax Barneby | OXBEF |
| Bessey's locoweed | Oxytropis besseyi (Rydb.) Blank. var. obnapiformis (C.L. Porter) Welsh | OXBEO |
| Bessey's locoweed | Oxytropis besseyi (Rydb.) Blank. var. ventosa (Greene) Barneby | OXBEV |
| Bicknell's milkvetch | Astragalus consobrinus (Barneby) Welsh | ASCO16 |
| bicolor parkia | Parkia bicolor A. Chev. | PABI10 |
| Big Bend bluebonnet | Lupinus havardii S. Wats. | LUHA |
| big deervetch | Lotus crassifolius (Benth.) Greene | LOCR |
| big deervetch | Lotus crassifolius (Benth.) Greene var. crassifolius | LOCRC |
| big deervetch | Lotus crassifolius (Benth.) Greene var. otayensis Moran ex Isely | LOCRO |
| big trefoil | Lotus pedunculatus Cav. | LOPE80 |
| big-flower broom | Chamaecytisus supinus (L.) Link | CHSU22 |
| bigflower clover | Trifolium michelianum Savi | TRMI14 |
| bigleaf clover | Trifolium plumosum Dougl. ex Hook. ssp. amplifolium (J.S. Martin) J. Gillett | TRPLA |
| bigleaf lupine | Lupinus polyphyllus Lindl. | LUPO2 |
| bigleaf lupine | Lupinus polyphyllus Lindl. ssp. bernardianus (Abrams ex C.P. Sm.) Munz | LUPOB |
| bigleaf lupine | Lupinus polyphyllus Lindl. ssp. polyphyllus | LUPOP2 |
| bigleaf lupine | Lupinus polyphyllus Lindl. ssp. polyphyllus var. grandifolius (Lindl. ex J.G. Agardh) Torr. & Gray | LUPOG2 |
| bigleaf lupine | Lupinus polyphyllus Lindl. ssp. polyphyllus var. pallidipes (Heller) C.P. Sm. | LUPOP3 |
| bigleaf lupine | Lupinus polyphyllus Lindl. ssp. polyphyllus var. polyphyllus | LUPOP4 |
| bigleaf lupine | Lupinus polyphyllus Lindl. ssp. superbus (Heller) Munz | LUPOS |
| bigpod sesbania | Sesbania herbacea (P. Mill.) McVaugh | SEHE8 |
| Bingen lupine | Lupinus bingenensis Suksdorf | LUBI3 |
| Bingen lupine | Lupinus bingenensis Suksdorf var. bingenensis | LUBIB2 |
| Bingen lupine | Lupinus bingenensis Suksdorf var. dubius C.P. Sm. | LUBID |
| Bingen lupine | Lupinus bingenensis Suksdorf var. subsaccatus Suksdorf | LUBIS |
| Biolett's rush broom | Lotus junceus (Benth.) Greene var. biolettii (Greene) Ottley | LOJUB |
| bird vetch | Vicia cracca L. | VICR |
| bird vetch | Vicia cracca L. ssp. cracca | VICRC |
| bird's-foot | Ornithopus L. | ORNIT2 |
| bird's-foot trefoil | Lotus corniculatus L. | LOCO6 |
| bird's-foot trefoil | Lotus corniculatus L. var. corniculatus | LOCOC5 |
| bird-of-paradise shrub | Caesalpinia gilliesii (Wallich ex Hook.) Wallich ex D. Dietr. | CAGI |
| birdflower | Crotalaria cunninghamii R. Br. | CRCU7 |
| birdnest milkvetch | Astragalus nidularius Barneby | ASNI2 |
| bishop's milkvetch | Astragalus episcopus S. Wats. | ASEP |
| bishop's milkvetch | Astragalus episcopus S. Wats. var. episcopus | ASEPE |
| bishop's milkvetch | Astragalus episcopus S. Wats. var. lancearius (Gray) Isely | ASEPL |
| Bithynian vetch | Vicia bithynica (L.) L. | VIBI6 |
| Bitterroot milkvetch | Astragalus scaphoides (M.E. Jones) Rydb. | ASSC4 |
| bituminaria | Bituminaria Heister ex Fabr. | BITUM |
| Bituminaria bituminosa | Aspalthium bituminosum (L.) Kuntze | ASBI5 |
| Bituminaria bituminosa | Psoralea bituminosa L. | PSBI |
| black ambret | Mimosa ceratonia L. | MICE |
| black coral-pea | Kennedia nigricans Lindl. | KENI |
| black cutch | Acacia catechu (L. f.) Willd. [excluded] | ACCA21 |
| black gram | Vigna mungo (L.) Hepper | VIMU7 |
| black locust | Robinia pseudoacacia L. | ROPS |
| black medick | Medicago lupulina L. | MELU |
| black nicker | Caesalpinia monensis Britt. | CAMO14 |
| black prairie clover | Dalea frutescens Gray | DAFR2 |
| black vetch | Vicia nigricans Hook. & Arn. | VINI81 |
| black vetch | Vicia nigricans Hook. & Arn. ssp. nigricans Hook. & Arn. [excluded] | VININ2 |
| black wattle | Acacia mearnsii de Wildeman | ACME80 |
| blackbead | Pithecellobium jiringa (W. Jack) Prain ex King | PIJI |
| blackbead | Pithecellobium Mart. | PITHE |
| blackbrush acacia | Acacia rigidula Benth. | ACRI |
| blackbrush wattle | Acacia anegadensis Britt. [excluded] | ACAN4 |
| blackdisk medick | Medicago orbicularis (L.) Bartalini | MEOR2 |
| blackeyed pea | Vigna unguiculata (L.) Walp. | VIUN |
| blackeyed pea | Vigna unguiculata (L.) Walp. ssp. dekindtiana (Harms) Verdc. | VIUND |
| blackish oxytrope | Oxytropis nigrescens (Pallas) Fisch. ex DC. | OXNI |
| blackish oxytrope | Oxytropis nigrescens (Pallas) Fisch. ex DC. var. nigrescens | OXNIN2 |
| blackwood | Acacia melanoxylon R. Br. ex Ait. f. | ACME |
| blackwood | Acacia penninervis Sieber ex DC. | ACPE10 |
| bladder senna | Colutea arborescens L. | COAR6 |
| bladder-senna | Colutea istria Mill. | COIS2 |
| blister vetch | Vicia ervilia (L.) Willd. [excluded] | VIER81 |
| bloodwoodtree | Haematoxylum campechianum L. | HACA2 |
| blue fenugreek | Trigonella caerulea (L.) Ser. | TRCA14 |
| blue lupine | Lupinus pilosus L. | LUPI9 |
| Blue Mountain milkvetch | Astragalus reventus Gray | ASRE5 |
| Blue Mountain prairie clover | Dalea ornata (Dougl. ex Hook.) Eat. & J. Wright | DAOR2 |
| blue nodding locoweed | Oxytropis deflexa (Pallas) DC. var. sericea Torr. & Gray | OXDES |
| blue paloverde | Parkinsonia florida (Benth. ex Gray) S. Wats. | PAFL6 |
| blue rattlesnake | Crotalaria verrucosa L. | CRVE5 |
| blue wild indigo | Baptisia australis (L.) R. Br. ex Ait. f. | BAAU |
| blue wild indigo | Baptisia australis (L.) R. Br. ex Ait. f. var. aberrans (Larisey) M. Mendenhall | BAAUA2 |
| blue wild indigo | Baptisia australis (L.) R. Br. ex Ait. f. var. australis | BAAUA |
| blue wild indigo | Baptisia australis (L.) R. Br. ex Ait. f. var. minor (Lehm.) Fern. | BAAUM |
| blue wiss | Teramnus labialis (L. f.) Spreng. | TELA2 |
| blue-oxalis | Parochetus communis Buch.-Ham. ex D. Don | PACO49 |
| bluebonnet lupine | Lupinus palmeri S. Wats. | LUPA3 |
| blunt-leaf cassia | Senna artemisioides (Gaud. ex DC.) Randell ssp. helmsii (Symon) Randell | SEARH |
| bluntlobe lupine | Lupinus obtusilobus Heller | LUOB |
| bluntpod bundleflower | Desmanthus obtusus S. Wats. | DEOB2 |
| Boccone's clover | Trifolium bocconei Savi | TRBO10 |
| Bodin's milkvetch | Astragalus bodinii Sheldon | ASBO |
| Boise milkvetch | Astragalus adanus A. Nels. | ASAD2 |
| Boissier's clover | Trifolium boissieri Guss. ex Soy.-Will. & Godr. | TRBO11 |
| Bolander's milkvetch | Astragalus bolanderi Gray | ASBO2 |
| Bolander's pea | Lathyrus vestitus Nutt. ssp. bolanderi (S. Wats.) C.L. Hitchc. | LAVEB |
| bonavist-bean | Lablab purpureus (L.) Sweet ssp. purpureus | LAPUP3 |
| Bonneville pea | Lathyrus brachycalyx Rydb. | LABR |
| Bonneville pea | Lathyrus brachycalyx Rydb. ssp. brachycalyx | LABRB |
| boreal locoweed | Oxytropis borealis DC. | OXBO |
| boreal locoweed | Oxytropis borealis DC. var. australis Welsh | OXBOA |
| boreal locoweed | Oxytropis borealis DC. var. borealis | OXBOB |
| boreal locoweed | Oxytropis borealis DC. var. sulphurea (Porsild) Welsh | OXBOS |
| Borrego milkvetch | Astragalus lentiginosus Dougl. ex Hook. var. borreganus M.E. Jones | ASLEB |
| Bourgov's milkvetch | Astragalus bourgovii Gray | ASBO3 |
| bower wattle | Acacia cognata Domin | ACCO15 |
| Boykin's clusterpea | Dioclea multiflora (Torr. & Gray) C. Mohr | DIMU |
| bramble acacia | Acacia victoriae Benth. | ACVI7 |
| branched fenugreek | Trigonella ?ramosa L. | TRRA8 |
| branched Indian clover | Trifolium dichotomum Hook. & Arn. | TRDI6 |
| Brandegee's clover | Trifolium brandegeei S. Wats. | TRBR2 |
| Brandegee's milkvetch | Astragalus brandegeei Porter | ASBR5 |
| brasiletto | Caesalpinia violacea Standl. | CAVI22 |
| Braunton's milkvetch | Astragalus brauntonii Parish | ASBR6 |
| Brazilian firetree | Schizolobium parahybum (Vell.) Blake | SCPA23 |
| Brazilian firetree | Schizolobium Vogel | SCHIZ9 |
| Brazilian jackbean | Canavalia brasiliensis Mart. ex Benth. | CABR21 |
| Brazilwood | Caesalpinia echinata Lam. | CAEC3 |
| Brazos milkvetch | Astragalus brazoensis Buckl. | ASBR7 |
| Brewer's lupine | Lupinus breweri Gray | LUBR3 |
| Brewer's lupine | Lupinus breweri Gray var. breweri | LUBRB2 |
| Brewer's milkvetch | Astragalus breweri Gray | ASBR8 |
| bridal broom | Retama monosperma (L.) Boiss. | REMO2 |
| bridal broom | Retama Raf. | RETAM |
| bristly locust | Robinia hispida L. | ROHI |
| bristly locust | Robinia hispida L. var. fertilis (Ashe) Clausen | ROHIF8 |
| bristly locust | Robinia hispida L. var. hispida | ROHIH |
| bristly locust | Robinia hispida L. var. nana (Ell.) DC. | ROHIN |
| bristly locust | Robinia hispida L. var. rosea Pursh | ROHIR |
| broadkeel milkvetch | Astragalus platytropis Gray | ASPL3 |
| broadleaf lancepod | Lonchocarpus heptaphyllus (Poir.) DC. | LOHE7 |
| broadleaf lupine | Lupinus latifolius Lindl. ex J.G. Agardh | LULA4 |
| broadleaf lupine | Lupinus latifolius Lindl. ex J.G. Agardh ssp. dudleyi (Rydb.) Kenney & D. Dunn | LULAD |
| broadleaf lupine | Lupinus latifolius Lindl. ex J.G. Agardh ssp. latifolius | LULAL3 |
| broadleaf lupine | Lupinus latifolius Lindl. ex J.G. Agardh ssp. leucanthus (Rydb.) Kenney & D. Dunn | LULAL |
| broadleaf lupine | Lupinus latifolius Lindl. ex J.G. Agardh ssp. longipes (Greene) Kenney & D. Dunn | LULAL2 |
| broadleaf lupine | Lupinus latifolius Lindl. ex J.G. Agardh ssp. parishii (C.P. Sm.) Kenney & D. Dunn | LULAP2 |
| broadleaf lupine | Lupinus latifolius Lindl. ex J.G. Agardh ssp. viridifolius (Heller) Kenney & D. Dunn | LULAV |
| broadleaf lupine | Lupinus latifolius Lindl. ex J.G. Agardh ssp. viridifolius (Heller) Kenney & D. Dunn var. barbatus (Henderson) Munz | LULAB |
| broadleaf lupine | Lupinus latifolius Lindl. ex J.G. Agardh ssp. viridifolius (Heller) Kenney & D. Dunn var. viridifolius (Heller) C.P. Sm. | LULAV2 |
| broadleaf milkvetch | Astragalus lentiginosus Dougl. ex Hook. var. chartaceus M.E. Jones | ASLEC |
| broadpod nicker | Pomaria brachycarpa (Gray) B. Simpson | POBR21 |
| broadsepal yellowhood | Nissolia platycalyx S. Wats. | NIPL |
| broom | Cytisus Desf. | CYTIS |
| broom | Genista L. | GENIS |
| broom | Spartium L. | SPART2 |
| broom dalea | Psorothamnus scoparius (Gray) Rydb. | PSSC6 |
| broom wattle | Acacia calamifolia Sweet ex Lindl. | ACCA24 |
| brown moor clover | Trifolium spadiceum L. | TRSP10 |
| brown nicker | Caesalpinia portoricensis (Britt. & P. Wilson) Alain | CAPO6 |
| Brown's Indian rosewood | Dalbergia brownei (Jacq.) Schinz | DABR2 |
| Brown's pea | Lathyrus lanszwertii Kellogg var. brownii (Eastw.) Jepson | LALAB2 |
| brownhair snoutbean | Rhynchosia cinerea Nash | RHCI3 |
| browse milkvetch | Astragalus cibarius Sheldon | ASCI2 |
| Bruneau milkvetch | Astragalus camptopus Barneby | ASCA10 |
| brushpea | Genistidium dumosum I.M. Johnston | GEDU |
| brushpea | Genistidium I.M. Johnston | GENIS2 |
| Brya ebenus | Aspalatus ebenus L. | ASEB3 |
| bucayo | Erythrina fusca Lour. | ERFU2 |
| buckroot | Pediomelum canescens (Michx.) Rydb. | PECA25 |
| buckwheat milkvetch | Astragalus caricinus (M.E. Jones) Barneby | ASCA12 |
| buffalo clover | Trifolium reflexum L. | TRRE2 |
| bull clover | Trifolium fucatum Lindl. | TRFU |
| bull horn acacia | Acacia collinsii Saff. | ACCO24 |
| Bullfrog Mountain pea | Lathyrus hitchcockianus Barneby & Reveal | LAHI4 |
| bullhorn wattle | Acacia cornigera (L.) Willd. | ACCO5 |
| bundleflower | Desmanthus Willd. | DESMA |
| Burchell's clover | Trifolium burchellianum Ser. | TRBU4 |
| burclover | Medicago polymorpha L. | MEPO3 |
| burdock clover | Trifolium lappaceum L. | TRLA18 |
| Burma padauk | Pterocarpus macrocarpus Kurz | PTMA7 |
| burr medick | Medicago minima (L.) L. | MEMI |
| bush pea | Lathyrus brachycalyx Rydb. ssp. zionis (C.L. Hitchc.) Welsh | LABRZ2 |
| bush vetch | Vicia sepium L. | VISE |
| bush vetch | Vicia sepium L. var. montana W.D.J. Koch | VISEM8 |
| bush vetch | Vicia sepium L. var. sepium | VISES |
| bush vetchling | Lathyrus eucosmus Butters & St. John | LAEU |
| bushbean | Macroptilium (Benth.) Urban | MACRO4 |
| butea | Butea Roxb. ex Willd. | BUTEA |
| butterfly pea | Centrosema (DC.) Benth. | CENTR2 |
| butterfly tree | Bauhinia purpurea L. | BAPU |
| cabbagebark tree | Andira inermis (W. Wright) Kunth ex DC. | ANIN |
| Caesalpinia bonduc | Caesalpinia crista auct. non L. [misapplied] | CACR28 |
| Caesalpinia bonduc | Guilandina bonduc L. | GUBO |
| Caesalpinia bonduc | Guilandina crista auct. non (L.) Small [misapplied] | GUCR |
| Caesalpinia caudata | Hoffmannseggia caudata Gray | HOCA8 |
| Caesalpinia ciliata | Caesalpinia melanosperma (Eggers) Urban | CAME15 |
| Caesalpinia ciliata | Guilandina melanosperma Eggers | GUME |
| Caesalpinia coriaria | Libidibia coriaria (Jacq.) Schlecht. | LICO11 |
| Caesalpinia decapetala | Biancaea sepiaria (Roxb.) Todaro | BISE2 |
| Caesalpinia decapetala | Caesalpinia sepiaria Roxb. | CASE15 |
| Caesalpinia divergens | Guilandina divergens (Urban) Britt. | GUDI2 |
| Caesalpinia gilliesii | Poinciana gilliesii Wallich ex Hook. | POGI2 |
| Caesalpinia kavaiensis | Mezonevron kavaiense (Mann) Hbd. | MEKA |
| Caesalpinia major | Caesalpinia globulorum Bakh. f. & van Royen | CAGL22 |
| Caesalpinia major | Guilandina ovalifolia (Urban) Britt. | GUOV2 |
| Caesalpinia mexicana | Poinciana mexicana (Gray) Britt. & Rose | POME8 |
| Caesalpinia myabensis | Caesalpinia clementis (Britton) Leon | CACL8 |
| Caesalpinia portoricensis | Guilandina portoricensis Britt. & P. Wilson | GUPO |
| Caesalpinia pulcherrima | Poinciana pulcherrima L. | POPU12 |
| Caesalpinia wootonii | Caesalpinia atropunctata Eifert | CAAT11 |
| Caesalpinia wootonii | Hoffmannseggia melanosticta (Schauer) Gray | HOME2 |
| Cahaba prairie clover | Dalea cahaba J. Allison | DACA19 |
| cajanus | Cajanus Adans. | CAJAN |
| Cajanus cajan | Cajan cajan (L.) Huth | CACA46 |
| Cajanus cajan | Cajanus indicus Sprengel | CAIN44 |
| Cajanus goensis | Dolichos ornatus Wall., nom. nud. [anomalous] | DOOR3 |
| Cajanus marmoratus | Atylosia marmorata R. Br. ex Benth. | ATMA6 |
| Cajanus scarabaeoides | Atylosia scarabaeoides (L.) Benth. | ATSC |
| Cajanus scarabaeoides | Cantharospermum scarabaeoides (L.) Baillon | CASC35 |
| Calabar bean | Physostigma venenosum Balf. | PHVE11 |
| Caley pea | Lathyrus hirsutus L. | LAHI2 |
| California false indigo | Amorpha californica Nutt. | AMCA5 |
| California false indigo | Amorpha californica Nutt. var. californica | AMCAC |
| California goldenbanner | Thermopsis californica S. Wats. | THCA4 |
| California goldenbanner | Thermopsis californica S. Wats. var. argentata (Greene) C.J. Chen & B.L. Turner | THCAA |
| California goldenbanner | Thermopsis californica S. Wats. var. californica | THCAC2 |
| California goldenbanner | Thermopsis californica S. Wats. var. semota (Jepson) C.J. Chen & B.L. Turner | THCAS2 |
| California Indian breadroot | Pediomelum californicum (S. Wats.) Rydb. | PECA33 |
| California indigobush | Psorothamnus arborescens (Torr. ex Gray) Barneby var. simplifolius (Parish) Barneby | PSARS |
| California pea | Lathyrus jepsonii Greene ssp. californicus (S. Wats.) C.L. Hitchc. | LAJEC |
| California redbud | Cercis orbiculata Greene | CEOR9 |
| Callaway milkvetch | Astragalus callithrix Barneby | ASCA8 |
| Calliandra caracasana | Zapoteca caracasana (Jacq.) H. Hern?ndez [excluded] | ZACA9 |
| Calliandra eriophylla | Calliandra eriophylla Benth. var. chamaedrys Isely | CAERC |
| Calliandra eriophylla | Calliandra eriophylla Benth. var. eriophylla Benth. [superfluous autonym] | CAERE |
| Calliandra haematomma | Anneslea haematostoma (Bertero ex DC.) Britt. | ANHA4 |
| Calliandra humilis var. humilis | Calliandra herbacea Engelm. | CAHE |
| Calliandra humilis var. reticulata | Calliandra reticulata Gray | CARE |
| Calliandra purpurea | Anneslea purpurea (L.) Britt. | ANPU11 |
| callingcard vine | Entada Adans. | ENTAD2 |
| callingcard vine | Entada polystachya (L.) DC. | ENPO4 |
| callingcard vine | Entada polystachya (L.) DC. var. polyphylla (Benth.) Barneby | ENPOP |
| calopo | Calopogonium mucunoides Desv. | CAMU11 |
| calopogonium | Calopogonium Desv. | CALOP3 |
| Calopogonium caeruleum | Stenolobium caeruleum Benth. | STCA16 |
| Calopogonium mucunoides | Calopogonium orthocarpum Urban | CAOR11 |
| camel's foot | Bauhinia esculenta Burchell | BAES |
| camelthorn | Acacia erioloba E. Mey. | ACER4 |
| camelthorn | Alhagi maurorum Medik. | ALMA12 |
| camwood | Baphia nitida Lodd. | BANI3 |
| Canadian milkvetch | Astragalus canadensis L. | ASCA11 |
| Canadian milkvetch | Astragalus canadensis L. var. canadensis | ASCAC6 |
| Canary broom | Genista canariensis L. | GECA16 |
| Canary Island flatpod | Adenocarpus foliolosus (Aiton) DC. | ADFO2 |
| canarybird-bush | Crotalaria agatiflora Schweinf. | CRAG2 |
| Canavalia campylocarpa | Canavalia dictyota Piper [excluded] | CADI43 |
| Canavalia hawaiiensis | Canavalia iaoensis St. John | CAIA |
| Canavalia hawaiiensis | Canavalia kauensis St. John | CAKA4 |
| Canavalia hawaiiensis | Canavalia rockii St. John | CARO11 |
| Canavalia hawaiiensis | Canavalia sanguinea St. John | CASA12 |
| Canavalia kauaiensis | Canavalia centralis St. John | CACE3 |
| Canavalia molokaiensis | Canavalia peninsularis St. John | CAPE14 |
| Canavalia molokaiensis | Canavalia stenophylla St. John | CAST18 |
| Canavalia napaliensis | Canavalia makahaensis St. John | CAMA22 |
| Canavalia napaliensis | Canavalia nualoloensis St. John | CANU9 |
| Canavalia nitida | Canavalia rusiosperma Urban | CARU13 |
| Canavalia pubescens | Canavalia forbesii St. John | CAFO5 |
| Canavalia pubescens | Canavalia haleakalaensis St. John | CAHA11 |
| Canavalia pubescens | Canavalia lanaiensis (Rock) O.& I. Deg. | CALA36 |
| Canavalia pubescens | Canavalia munroi (O.& I. Deg.) St. John | CAMU12 |
| Canavalia rosea | Canavalia lineata auct. non (Thunb.) DC. [misapplied] | CALI9 |
| Canavalia rosea | Canavalia maritima Thouars | CAMA6 |
| cancer bush | Sutherlandia frutescens (L.) R. Br. | SUFR3 |
| candelabra wattle | Acacia holosericea A. Cunn. ex G. Don | ACHO2 |
| canoe milkvetch | Astragalus cymboides M.E. Jones | ASCY2 |
| canyon bird's-foot trefoil | Lotus argyraeus (Greene) Greene | LOAR4 |
| canyon bird's-foot trefoil | Lotus argyraeus (Greene) Greene var. argyraeus | LOARA4 |
| canyon bird's-foot trefoil | Lotus argyraeus (Greene) Greene var. multicaulis (Ottley) Isely | LOARM |
| canyon bird's-foot trefoil | Lotus argyraeus (Greene) Greene var. notitius Isely | LOARN2 |
| canyon clover | Trifolium howellii S. Wats. | TRHO |
| Canyonlands prairie clover | Dalea flavescens (S. Wats.) Welsh | DAFL |
| Capetown pea | Otholobium fruticans (L.) Stirton | OTFR |
| Caracas rattlebox | Crotalaria micans Link | CRMI9 |
| caracol illo | Poitea punicea (Urban) Lavin | POPU19 |
| Caragana arborescens | Caragana arborescens Lam. var. pendula Carriere | CAARP2 |
| Caragana arborescens | Caragana fruticosa (Pall.) Besser | CAFR20 |
| Caragana erinacea | Caragana maximowicziana Kom. | CAMA53 |
| Caragana manshurica | Caragana microphylla Lam. | CAMIM3 |
| Caragana zahlbruckneri var. pekinensis | Caragana pekinensis Kom. | CAPE36 |
| Caribbean snoutbean | Rhynchosia caribaea (Jacq.) DC. | RHCA80 |
| carmichaelia | Carmichaelia R. Br. | CARMI2 |
| Carolina clover | Trifolium carolinianum Michx. | TRCA6 |
| Carolina indigo | Indigofera caroliniana P. Mill. | INCA |
| Carolina vetch | Vicia caroliniana Walt. | VICA2 |
| carpon desmodium | Desmodium heterocarpon (L.) DC. ssp. heterocarpon | DEHEH4 |
| Cartagena prairie clover | Dalea carthagenensis (Jacq.) J.F. Macbr. | DACA9 |
| Cartagena prairie clover | Dalea carthagenensis (Jacq.) J.F. Macbr. var. carthagenensis | DACAC3 |
| cascabelillo alado | Crotalaria stipularia Desv. | CRST4 |
| cascabelillo axilar | Crotalaria lotifolia L. | CRLO4 |
| Cascade clover | Trifolium eriocephalum Nutt. ssp. cascadense J. Gillett | TRERC2 |
| Case's milkvetch | Astragalus casei Gray ex Brewer & S. Wats. | ASCA14 |
| casia amarilla | Senna spectabilis (DC.) Irwin & Barneby | SESP9 |
| casia amarilla | Senna spectabilis (DC.) Irwin & Barneby var. spectabilis | SESPS3 |
| cassia | Cassia L. | CASSI |
| Cassia fistula | Cassia fistulosa L. ex Long & Lakela | CAFI9 |
| Cassia roxburghii | Cassia marginata Roxb. | CAMA48 |
| Castetter's milkvetch | Astragalus castetteri Barneby | ASCA16 |
| catbells | Baptisia perfoliata (L.) R. Br. ex Ait. f. | BAPE3 |
| catch and keep | Acacia retusa (Jacq.) Howard | ACRE4 |
| catclaw acacia | Acacia greggii Gray | ACGR |
| catclaw acacia | Acacia greggii Gray var. greggii | ACGRG3 |
| catclaw acacia | Acacia greggii Gray var. wrightii (Benth.) Isely | ACGRW |
| catclaw blackbead | Pithecellobium unguis-cati (L.) Benth. | PIUN |
| catclaw mimosa | Mimosa aculeaticarpa Ortega | MIAC3 |
| catclaw mimosa | Mimosa aculeaticarpa Ortega var. biuncifera (Benth.) Barneby | MIACB |
| catechu tree | Acacia polyacantha Willd. | ACPO3 |
| catjang | Vigna unguiculata (L.) Walp. ssp. cylindrica (L.) Verdc. | VIUNC2 |
| Cedar Breaks milkvetch | Astragalus limnocharis Barneby | ASLI3 |
| Cedar Breaks milkvetch | Astragalus limnocharis Barneby var. limnocharis | ASLIL2 |
| cedar wattle | Acacia elata A. Cunningham ex Benth. | ACEL |
| Cedros milkvetch | Astragalus insularis Kellogg | ASIN6 |
| Centrosema arenicola | Bradburya arenicola Small | BRAR13 |
| Centrosema arenicola | Bradburya floridana Britt. | BRFL2 |
| Centrosema arenicola | Centrosema floridanum (Britt.) Lakela | CEFL3 |
| Centrosema plumieri | Bradburya plumieri (Turp. ex Pers.) Kuntze | BRPL4 |
| Centrosema pubescens | Bradburya pubescens (Benth.) Kuntze | BRPU13 |
| Centrosema virginianum | Bradburya virginiana (L.) Kuntze | BRVI5 |
| Centrosema virginianum | Centrosema virginianum (L.) Benth. var. ellipticum (DC.) Fern. | CEVIE |
| ceratonia | Ceratonia L. | CERAT4 |
| cercipo | Myrospermum frutescens Jacq. | MYFR2 |
| Cercis canadensis var. mexicana | Cercis canadensis L. ssp. mexicana (Rose) E. Murr. | CECAM2 |
| Cercis canadensis var. texensis | Cercis canadensis L. ssp. texensis (S. Wats.) E. Murr. | CECAT2 |
| Cercis canadensis var. texensis | Cercis occidentalis Torr. ex Gray | CEOC3 |
| Cercis orbiculata | Cercis canadensis L. var. orbiculata (Greene) Barneby | CECAO |
| Cercis orbiculata | Cercis occidentalis Torr. ex Gray var. orbiculata (Greene) Tidestrom | CEOCO |
| Cercis siliquastrum | Cercis siliquastrum L. var. alba Weston | CESIA |
| cha?ar | Geoffroea decorticans (Gillies ex Hook. & Arn.) Burkart | GEDE10 |
| Chaco milkvetch | Astragalus micromerius Barneby | ASMI5 |
| Challis milkvetch | Astragalus amblytropis Barneby | ASAM2 |
| chamaecrista | Chamaecrista mimosoides (L.) Greene | CHMI6 |
| Chamaecrista absus var. absus | Cassia absus L. [excluded] | CAAB16 |
| Chamaecrista absus var. meonandra | Cassia absus L. var. meonandra Irwin & Barneby | CAABM |
| Chamaecrista calycioides | Cassia aristellata (Pennell) Cory ex Cory & Parks | CAAR9 |
| Chamaecrista calycioides | Cassia calycioides DC. ex Colladon | CACA30 |
| Chamaecrista chamaecristoides var. cruziana | Chamaecrista cruziana Britt. & Rose | CHCR3 |
| Chamaecrista deeringiana | Cassia deeringiana (Small & Pennell) J.F. Macbr. | CADE16 |
| Chamaecrista desvauxii var. latistipula | Cassia latistipula Benth. | CALA72 |
| Chamaecrista dimidiata | Cassia mimosoides L. var. nomame Makino | CAMIN2 |
| Chamaecrista diphylla | Cassia diphylla L. | CADI14 |
| Chamaecrista fasciculata var. fasciculata | Cassia brachiata (Pollard) J.F. Macbr. | CABR26 |
| Chamaecrista fasciculata var. fasciculata | Cassia chamaecrista L. | CACH32 |
| Chamaecrista fasciculata var. fasciculata | Cassia fasciculata Michx. | CAFA |
| Chamaecrista fasciculata var. fasciculata | Cassia fasciculata Michx. var. brachiata (Pollard) Pullen ex Isely | CAFAB |
| Chamaecrista fasciculata var. fasciculata | Cassia fasciculata Michx. var. depressa (Pollard) J.F. Macbr. | CAFAD |
| Chamaecrista fasciculata var. fasciculata | Cassia fasciculata Michx. var. ferrisiae (Britt. ex Britt. & Rose) Turner | CAFAF |
| Chamaecrista fasciculata var. fasciculata | Cassia fasciculata Michx. var. puberula (Greene) J.F. Macbr. | CAFAP |
| Chamaecrista fasciculata var. fasciculata | Cassia fasciculata Michx. var. robusta (Pollard) J.F. Macbr. | CAFAR3 |
| Chamaecrista fasciculata var. fasciculata | Cassia fasciculata Michx. var. rostrata (Woot. & Standl.) B.L. Turner | CAFAR2 |
| Chamaecrista fasciculata var. fasciculata | Cassia fasciculata Michx. var. tracyi (Pollard) J.F. Macbr. | CAFAT |
| Chamaecrista fasciculata var. fasciculata | Cassia mississippiensis Pollard | CAMI30 |
| Chamaecrista fasciculata var. fasciculata | Cassia robusta (Pollard) Pollard | CARO17 |
| Chamaecrista fasciculata var. fasciculata | Cassia rostrata (Woot. & Standl.) Tidestrom ex Tidestrom & Kittell | CARO19 |
| Chamaecrista fasciculata var. fasciculata | Chamaecrista brachiata Pollard | CHBR6 |
| Chamaecrista fasciculata var. fasciculata | Chamaecrista depressa (Pollard) Greene | CHDE14 |
| Chamaecrista fasciculata var. fasciculata | Chamaecrista fasciculata (Michx.) Greene var. brachiata (Pollard) Isely | CHFAB |
| Chamaecrista fasciculata var. fasciculata | Chamaecrista littoralis Pollard | CHLI9 |
| Chamaecrista fasciculata var. fasciculata | Chamaecrista mississippiensis (Pollard) Pollard ex Heller | CHMI13 |
| Chamaecrista fasciculata var. fasciculata | Chamaecrista robusta (Pollard) Pollard ex Heller | CHRO5 |
| Chamaecrista fasciculata var. fasciculata | Chamaecrista rostrata Woot. & Standl. | CHRO6 |
| Chamaecrista fasciculata var. fasciculata | Chamaecrista tracyi Pollard | CHTR11 |
| Chamaecrista fasciculata var. macrosperma | Cassia fasciculata Michx. var. macrosperma Fern. | CAFAM |
| Chamaecrista flexuosa | Cassia flexuosa L. | CAFL37 |
| Chamaecrista flexuosa var. texana | Cassia texana Buckl. | CATE10 |
| Chamaecrista glandulosa var. glandulosa | Cassia glandulosa L. | CAGL16 |
| Chamaecrista glandulosa var. mirabilis | Cassia mirabilis (Pollard) Urban | CAMI20 |
| Chamaecrista glandulosa var. mirabilis | Chamaecrista mirabilis Pollard | CHMI14 |
| Chamaecrista glandulosa var. swartzii | Cassia glandulosa L. var. swartzii (Wikstr.) J.F. Macbr. | CAGLS |
| Chamaecrista glandulosa var. swartzii | Chamaecrista swartzii (Wikstr.) Britt. | CHSW |
| Chamaecrista greggii | Cassia greggii Gray | CAGR7 |
| Chamaecrista lineata var. brachyloba | Cassia grammica Spreng. | CAGR10 |
| Chamaecrista lineata var. brachyloba | Cassia granulata (Urban) J.F. Macbr. | CAGR12 |
| Chamaecrista lineata var. brachyloba | Cassia lineata Sw. var. brachyloba Griseb. | CALIB2 |
| Chamaecrista lineata var. brachyloba | Chamaecrista granulata (Urban) Britt. | CHGR16 |
| Chamaecrista lineata var. keyensis | Cassia keyensis (Pennell) J.F. Macbr. | CAKE3 |
| Chamaecrista lineata var. keyensis | Chamaecrista keyensis Pennell | CHKE2 |
| Chamaecrista mimosoides | Cassia mimosoides L. | CAMI44 |
| Chamaecrista nictitans ssp. nictitans var. aspera | Cassia aspera Muhl. ex Ell. | CAAS3 |
| Chamaecrista nictitans ssp. nictitans var. aspera | Chamaecrista aspera (Muhl. ex Ell.) Greene | CHAS5 |
| Chamaecrista nictitans ssp. nictitans var. diffusa | Cassia exunguis Urban | CAEX9 |
| Chamaecrista nictitans ssp. nictitans var. diffusa | Chamaecrista exunguis (Urban) Britt. ex Britt. & Rose | CHEX4 |
| Chamaecrista nictitans ssp. nictitans var. leptadenia | Cassia leptadenia Greenm. | CALE15 |
| Chamaecrista nictitans ssp. nictitans var. leptadenia | Cassia nictitans L. var. mensalis (Greenm.) Irwin & Barneby | CANIM |
| Chamaecrista nictitans ssp. nictitans var. nictitans | Cassia aspera Muhl. ex Ell. var. mohrii Pollard | CAASM |
| Chamaecrista nictitans ssp. nictitans var. nictitans | Cassia nictitans L. | CANI4 |
| Chamaecrista nictitans ssp. nictitans var. nictitans | Cassia nictitans L. var. commixta (Pollard & (Maxon) Millsp. | CANIC |
| Chamaecrista nictitans ssp. nictitans var. nictitans | Cassia nictitans L. var. hebecarpa Fern. | CANIH |
| Chamaecrista nictitans ssp. nictitans var. nictitans | Cassia nictitans L. var. leiocarpa Fern. | CANIL |
| Chamaecrista nictitans ssp. nictitans var. nictitans | Cassia nictitans L. var. mohrii (Pollard) J. F. Macbr. | CANIM4 |
| Chamaecrista nictitans ssp. nictitans var. nictitans | Chamaecrista mohrii (Pollard) Small ex Britt. & Rose | CHMO4 |
| Chamaecrista nictitans ssp. nictitans var. nictitans | Chamaecrista multipinnata (Pollard) Greene | CHMU4 |
| Chamaecrista nictitans ssp. nictitans var. nictitans | Chamaecrista nictitans (L.) Moench var. hebecarpa (Fern.) C.F. Reed | CHNIH |
| Chamaecrista nictitans ssp. nictitans var. nictitans | Chamaecrista nictitans (L.) Moench var. leiocarpa (Fern.) Moldenke | CHNIL2 |
| Chamaecrista nictitans ssp. nictitans var. nictitans | Chamaecrista procumbens (L.) Greene | CHPR10 |
| Chamaecrista nictitans ssp. patellaria var. glabrata | Cassia aeschinomene DC. ex Colladon | CAAE5 |
| Chamaecrista nictitans ssp. patellaria var. glabrata | Cassia leschenaultiana DC. | CALE17 |
| Chamaecrista nictitans ssp. patellaria var. glabrata | Cassia leschenaultiana DC. var. aeschinomene (DC. ex Colladon) Benth. | CALEA2 |
| Chamaecrista nictitans ssp. patellaria var. glabrata | Chamaecrista aeschinomene (DC. ex Colladon) Greene | CHAE3 |
| Chamaecrista nictitans ssp. patellaria var. patellaria | Cassia patellaria DC. ex Colladon | CAPA35 |
| Chamaecrista nictitans ssp. patellaria var. patellaria | Chamaecrista patellaria (DC. ex Colladon) Greene | CHPA34 |
| Chamaecrista nictitans ssp. patellaria var. patellaria | Chamaecrista patellaria (DC. ex Colladon) Greene var. ramosa (Vogel) Irwin & Barneby | CHPAR |
| Chamaecrista pilosa | Cassia pilosa L. | CAPI9 |
| Chamaecrista portoricensis | Cassia portoricensis Urban | CAPO8 |
| Chamaecrista ramosa | Cassia ramosa Vogel [excluded] | CARA21 |
| Chamaecrista rotundifolia | Cassia rotundifolia Pers. | CARO12 |
| Chamaecrista serpens var. serpens | Cassia serpens L. | CASE11 |
| Chamaecrista serpens var. wrightii | Cassia wrightii Gray | CAWR2 |
| Chamaecrista serpens var. wrightii | Chamaecrista wrightii (Gray) Woot. & Standl. | CHWR4 |
| Chamaecytisus | Chamaecystis Link [orthographic error] | CHAMA12 |
| chamaecytisus | Chamaecytisus Link | CHAMA20 |
| Chamaecytisus glaber | Cytisus elongatus Waldst. & Kit. | CYEL9 |
| Chamaecytisus glaber | Cytisus glaber L. f. | CYGL7 |
| Chamaecytisus hirsutus | Cytisus hirsutus L. | CYHI8 |
| Chamaecytisus mollis | Cytisus mollis (Cav.) Pau, nom. illeg. [anomalous] | CYMO11 |
| Chamaecytisus palmensis | Chamaecystis palmensis (Christ) Bisby & K. Nicholls [orthographic error] | CHPA29 |
| Chamaecytisus palmensis | Cytisus palmensis (Christ) Hutchinson [excluded] | CYPA17 |
| Chamaecytisus prolifera | Chamaecystis prolifera (L. f.) Link [orthographic error] | CHPR7 |
| Chamaecytisus prolifera | Cytisus proliferus L. f. | CYPR13 |
| Chamaecytisus ratisbonensis | Cytisus ratisbonensis Schaeff. | CYRA5 |
| Chamaecytisus supinus | Cytisus supinus L. | CYSU9 |
| chamisso bush lupine | Lupinus chamissonis Eschsch. | LUCH |
| chaparral bird's-foot trefoil | Lotus grandiflorus (Benth.) Greene | LOGR3 |
| chaparral bird's-foot trefoil | Lotus grandiflorus (Benth.) Greene var. grandiflorus | LOGRG3 |
| chaparral bird's-foot trefoil | Lotus grandiflorus (Benth.) Greene var. macranthus (Greene) Isely | LOGRM |
| chaparral pea | Pickeringia Nutt. ex Torr. & Gray | PICKE |
| Chapman's senna | Senna mexicana (Jacq.) Irwin & Barneby var. chapmanii (Isely) Irwin & Barneby | SEMEC |
| chapmannia | Chapmannia Torr. & Gray | CHAPM |
| Chapmannia prismatica | Pachecoa prismatica (Sesse & Moc.) Standl. & B. G. Schub. | PAPR22 |
| cheesytoes | Stylosanthes hamata (L.) Taubert | STHA |
| Cherangani clover | Trifolium cheranganiense J. B. Gillett | TRCH5 |
| chestnut milkvetch | Astragalus castaneiformis S. Wats. | ASCA15 |
| chick pea | Cicer arietinum L. | CIAR5 |
| Chihuahuan lupine | Lupinus chihuahuensis S. Wats. | LUCH2 |
| Chihuahuan prairie clover | Dalea exigua Barneby | DAEX2 |
| Chihuahuan snoutbean | Rhynchosia edulis Griseb. | RHED |
| Chilean bird's-foot trefoil | Lotus wrangelianus Fisch. & C.A. Mey. | LOWR2 |
| Chilean clover | Trifolium chilense Hook. & Arn. | TRCH8 |
| Chilean clover | Trifolium macraei Hook. & Arn. | TRMA2 |
| Chinchilla wattle | Acacia chinchellensis Tindale | ACCH7 |
| Chinese albizia | Albizia chinensis (Osbeck) Merr. | ALCH2 |
| Chinese indigo | Indigofera decora Lindl. | INDE3 |
| Chinese licorice | Glycyrrhiza echinata L. | GLEC2 |
| Chinese milk-vetch | Astragalus sinicus L. | ASSI13 |
| Chinese milkvetch | Astragalus chinensis L. f. | ASCH6 |
| Chinese wisteria | Wisteria sinensis (Sims) DC. | WISI |
| chipil | Crotalaria cajanifolia Kunth | CRCA28 |
| Chisos prairie acacia | Acacia angustissima (P. Mill.) Kuntze var. chisosiana Isely | ACANC |
| Christia verspertilionis | Lourea verspertilionis (L. f.) Desv. | LOVE |
| Christmasbush | Senna bicapsularis (L.) Roxb. | SEBI5 |
| cibola milkvetch | Astragalus albulus Woot. & Standl. | ASAL5 |
| cicada milkvetch | Astragalus chamaeleuce Gray | ASCH4 |
| cicada milkvetch | Astragalus chamaeleuce Gray var. chamaeleuce | ASCHC2 |
| cicada milkvetch | Astragalus chamaeleuce Gray var. laccoliticus (M.E. Jones) Barneby ex Isely | ASCHL2 |
| cicer | Cicer L. | CICER |
| cicer milkvetch | Astragalus cicer L. | ASCI4 |
| cicercha purpurina | Lathyrus clymenum L. | LACL2 |
| cima milkvetch | Astragalus cimae M.E. Jones | ASCI3 |
| cima milkvetch | Astragalus cimae M.E. Jones var. cimae | ASCIC3 |
| cima milkvetch | Astragalus cimae M.E. Jones var. sufflatus Barneby | ASCIS |
| cinnecord | Acacia choriophylla Benth. | ACCH |
| Cisco milkvetch | Astragalus sabulosus M.E. Jones | ASSA3 |
| Cisco milkvetch | Astragalus sabulosus M.E. Jones var. sabulosus | ASSAS |
| Cladrastis kentukea | Cladrastis lutea (Michx. f.) K. Koch | CLLU |
| Cladrastis kentukea | Sophora kentukea Dum.-Cours. | SOKE |
| clammy clover | Trifolium obtusiflorum Hook. f. | TROB2 |
| clammy locust | Robinia viscosa Vent. | ROVI |
| clammy locust | Robinia viscosa Vent. var. viscosa | ROVIV |
| Clapperton's parkia | Parkia clappertoniana Keay | PACL9 |
| Cleveland's milkvetch | Astragalus clevelandii Greene | ASCL2 |
| Cliff Palace milkvetch | Astragalus deterior (Barneby) Barneby | ASDE4 |
| clitoria | Barbieria pinnata (Pers.) Baill. | BAPI3 |
| Clitoria falcata | Clitoria rubiginosa Juss. ex Pers. | CLRU4 |
| Clitoria falcata | Martiusia rubiginosa (Juss. ex Pers.) Britt. | MARU4 |
| Clitoria fragrans | Martiusia fragrans (Small) Small | MAFR8 |
| Clitoria laurifolia | Martiusia laurifolia (Poir.) Britt. | MALA10 |
| Clitoria mariana | Martiusia mariana (L.) Small | MAMA19 |
| Clitoria ternatea | Clitoria ternatea L. var. alba hort. | CLTEA |
| Clokey's milkvetch | Astragalus aequalis Clokey | ASAE |
| clover | Trifolium L. | TRIFO |
| clustered clover | Trifolium glomeratum L. | TRGL4 |
| clusterspike false indigo | Amorpha herbacea Walt. | AMHE |
| clusterspike false indigo | Amorpha herbacea Walt. var. crenulata (Rydb.) Isely | AMHEC |
| clusterspike false indigo | Amorpha herbacea Walt. var. herbacea | AMHEH |
| Coachella milkvetch | Astragalus lentiginosus Dougl. ex Hook. var. coachellae Barneby ex Shreve & Wiggins | ASLEC2 |
| coastal bird's-foot trefoil | Lotus salsuginosus Greene | LOSA |
| coastal bird's-foot trefoil | Lotus salsuginosus Greene var. brevivexillus Ottley | LOSAB |
| coastal bird's-foot trefoil | Lotus salsuginosus Greene var. salsuginosus | LOSAS |
| coastal dunes milkvetch | Astragalus tener Gray var. titi (Eastw.) Barneby | ASTET |
| coastal indigo | Indigofera miniata Ortega | INMI |
| cobana negra | Stahlia monosperma (Tul.) Urban | STMO |
| Cobb Mountain lupine | Lupinus sericatus Kellogg | LUSE3 |
| cobblestone milkvetch | Astragalus nudisiliquus A. Nels. | ASNU2 |
| cobwebby wild indigo | Baptisia arachnifera Duncan | BAAR |
| coccuswood | Brya P. Br. | BRYA |
| cock's spur | Erythrina eggersii Krukoff & Moldenke | EREG |
| cockshead sainfoin | Onobrychis caput-galli (L.) Lam. | ONCA3 |
| Codariocalyx gyroides | Desmodium gyroides (Roxb. ex Link) DC. | DEGY80 |
| Codariocalyx motorius | Desmodium motorium (Houtt.) Merr. | DEMO4 |
| coffeetree | Gymnocladus Lam. | GYMNO2 |
| cohoba tree | Anadenanthera peregrina (L.) Speg. | ANPE13 |
| coin-leaf desmodium | Desmodium styracifolium (Osbeck) Merr. | DEST5 |
| coinvine | Dalbergia ecastaphyllum (L.) Taubert | DAEC |
| cojoba | Cojoba Britt. & Rose | COJOB |
| Cojoba arborea | Pithecellobium arboreum (L.) Urban | PIAR3 |
| Cojoba graciliflora | Pithecellobium graciliflorum S.F. Blake | PIGR5 |
| collared annual lupine | Lupinus truncatus Nutt. ex Hook. & Arn. | LUTR2 |
| cologania | Cologania Kunth | COLOG |
| Cologania angustifolia | Cologania longifolia Gray | COLO10 |
| Cologania obovata | Cologania lemmonii Gray | COLE |
| Colorado spiny milkvetch | Astragalus kentrophyta Gray var. coloradoensis M.E. Jones | ASKEC |
| Colton's milkvetch | Astragalus coltonii M.E. Jones | ASCO8 |
| Colton's milkvetch | Astragalus coltonii M.E. Jones var. coltonii | ASCOC8 |
| Columbia milkvetch | Astragalus succumbens Dougl. ex Hook. | ASSU7 |
| Columbian milkvetch | Astragalus columbianus Barneby | ASCO9 |
| colutea | Colutea L. | COLUT |
| Colutea arborescens | Colutea brevialata Lange | COBR6 |
| Comanche Peak prairie clover | Dalea reverchonii (S. Wats.) Shinners | DARE2 |
| common bird's-foot | Ornithopus sativus Brot. | ORSA2 |
| common bird's-foot | Ornithopus sativus Brot. ssp. isthmocarpus (Coss.) Dost | ORSAI |
| common bird's-foot | Ornithopus sativus Brot. ssp. sativus | ORSAS |
| common deerweed | Lotus scoparius (Nutt.) Ottley | LOSC2 |
| common deerweed | Lotus scoparius (Nutt.) Ottley var. scoparius | LOSCS2 |
| common dunebroom | Parryella filifolia Torr. & Gray ex Gray | PAFI4 |
| common gorse | Ulex europaeus L. | ULEU |
| common kidneyvetch | Anthyllis vulneraria L. | ANVU |
| common restharrow | Ononis repens L. | ONRE |
| common salttree | Halimodendron halodendron (Pallas) Voss | HAHA8 |
| compact prairie clover | Dalea compacta Spreng. | DACO2 |
| compact prairie clover | Dalea compacta Spreng. var. compacta | DACOC |
| compact prairie clover | Dalea compacta Spreng. var. pubescens (Gray) Barneby | DACOP |
| conelike milkvetch | Astragalus whitneyi Gray var. confusus Barneby | ASWHC |
| Congdon's lupine | Lupinus congdonii (C.P. Sm.) D. Dunn | LUCO3 |
| Congdon's milkvetch | Astragalus congdonii S. Wats. | ASCO10 |
| connate erythrina | Erythrina corallodendron L. var. connata Krukoff | ERCOC6 |
| cooba | Acacia salicina Lindl. | ACSA10 |
| Cooley's bundleflower | Desmanthus cooleyi (Eat.) Trel. | DECO2 |
| Cooper's milkvetch | Astragalus neglectus (Torr. & Gray) Sheldon | ASNE2 |
| cootamundra wattle | Acacia baileyana F. Muell. | ACBA |
| copaiba | Copaifera officinalis (Jacq.) L. | COOF2 |
| copaifera | Copaifera L. | COPAI |
| copaifera | Copaifera multijuga Hayne | COMU7 |
| copper mine milkvetch | Astragalus cobrensis Gray | ASCO5 |
| copper mine milkvetch | Astragalus cobrensis Gray var. cobrensis | ASCOC6 |
| coral erythrina | Erythrina corallodendron L. | ERCO22 |
| coral-pea | Hardenbergia violacea (Schneev.) Stearn | HAVI9 |
| coralbean | Erythrina flabelliformis Kearney | ERFL7 |
| cordyla | Cordyla africana Lour. | COAF2 |
| cordyla | Cordyla Lour. | CORDY3 |
| Coronilla coronata | Coronilla montana Jacq. | COMO10 |
| Coronilla minima ssp. lotoides | Coronilla minima L. var. australis Gren. & Godr. | COMIA3 |
| Coronilla valentina ssp. glauca | Coronilla argentea L. | COAR15 |
| Cottam's milkvetch | Astragalus monumentalis Barneby var. cottamii (Welsh) Isely | ASMOC2 |
| Cotton's milkvetch | Astragalus cottonii M.E. Jones | ASCO13 |
| Coulter's stickpea | Zapoteca media (Mart. & Galeotti) H. Hern?ndez | ZAME2 |
| Coursetia caribaea var. caribaea | Benthamantha caribaea (Jacq.) Kunth | BECA6 |
| Coursetia caribaea var. caribaea | Cracca caribaea (Jacq.) Benth. | CRCA11 |
| Coursetia caribaea var. caribaea | Cracca edwardsii Gray p.p. | CRED |
| Coursetia caribaea var. caribaea | Galega caribaea Jacq. | GACA8 |
| Coursetia caribaea var. caribaea | Tephrosia caribaea (Jacq.) DC. | TECA10 |
| Coursetia caribaea var. sericea | Cracca edwardsii Gray var. sericea Gray | CREDS |
| Coursetia caribaea var. sericea | Cracca sericea (Gray) Gray | CRSE8 |
| Coursetia glabella | Benthamantha edwardsii (Gray) Rose var. glabella (Gray) Wiggins | BEEDG |
| Coursetia glabella | Benthamantha glabella (Gray) Rydb. | BEGL3 |
| Coursetia glabella | Cracca edwardsii Gray var. glabella Gray | CREDG |
| Coursetia glabella | Cracca glabella (Gray) Lavin | CRGL11 |
| Coursetia glandulosa | Coursetia microphylla Gray | COMI3 |
| Coves's cassia | Senna covesii (Gray) Irwin & Barneby | SECO10 |
| Coville's bundleflower | Desmanthus covillei (Britt. & Rose) Wiggins ex B.L. Turner | DECO4 |
| Cow Spring milkvetch | Astragalus vaccarum Gray | ASVA2 |
| cow vetch | Vicia cracca L. ssp. tenuifolia (Roth) Gaudin | VICRT |
| cow's-foot | Bauhinia forficata Link | BAFO |
| cowbag clover | Trifolium depauperatum Desv. | TRDE |
| cowbag clover | Trifolium depauperatum Desv. var. depauperatum | TRDED |
| cowitch | Mucuna pruriens (L.) DC. | MUPR |
| cowitch | Mucuna pruriens (L.) DC. var. pruriens | MUPRP |
| cowitch | Mucuna pruriens (L.) DC. var. utilis (Wallich ex Wight) Baker ex Burck | MUPRU |
| cowpea | Vigna minima (Roxb.) Ohwi & H. Ohashi | VIMI8 |
| cowpea | Vigna Savi | VIGNA |
| cows clover | Trifolium wormskioldii Lehm. | TRWO |
| crabseye | Rhynchosia phaseoloides (Sw.) DC. | RHPH |
| cream albizia | Albizia adinocephala (J.D. Sm.) Britt. & Rose ex Record | ALAD |
| cream milkvetch | Astragalus racemosus Pursh | ASRA2 |
| cream milkvetch | Astragalus racemosus Pursh var. longisetus M.E. Jones | ASRAL |
| cream milkvetch | Astragalus racemosus Pursh var. racemosus | ASRAR2 |
| cream pea | Lathyrus ochroleucus Hook. | LAOC2 |
| cream ticktrefoil | Desmodium ochroleucum M.A. Curtis ex Canby | DEOC2 |
| creek wattle | Acacia rivalis J. M. Black | ACRI7 |
| creeping lespedeza | Lespedeza repens (L.) W. Bart. | LERE2 |
| creeping milkvetch | Astragalus troglodytus S. Wats. | ASTR8 |
| creeping nicker | Hoffmannseggia repens (Eastw.) Cockerell | HORE |
| Crescent milkvetch | Astragalus amphioxys Gray | ASAM5 |
| Crescent milkvetch | Astragalus amphioxys Gray var. amphioxys | ASAMA |
| Crescent milkvetch | Astragalus amphioxys Gray var. modestus Barneby | ASAMM |
| Crescent milkvetch | Astragalus amphioxys Gray var. musimonum (Barneby) Barneby | ASAMM2 |
| cresta de gallo blanco | Teramnus uncinatus (L.) Sw. | TEUN |
| creta trefoil | Lotus creticus L. | LOCR3 |
| Cretan crownvetch | Securigera cretica (L.) Lassen | SECR8 |
| crimson clover | Trifolium incarnatum L. | TRIN3 |
| Cronquist's milkvetch | Astragalus cronquistii Barneby | ASCR4 |
| Crotalaria brevidens var. intermedia | Crotalaria intermedia Kotschy | CRIN25 |
| Crotalaria cajanifolia | Crotalaria eriocarpa Benth. | CRER7 |
| Crotalaria cajanifolia | Crotalaria guatemalensis Benth. | CRGU2 |
| Crotalaria ferruginea | Crotalaria leioloba Bartl. | CRLE16 |
| Crotalaria hebecarpa | Heylandia latebrosa auct. | HELA10 |
| Crotalaria impressa | Crotalaria astragalina Hochst. ex A. Rich. | CRAS7 |
| Crotalaria laburnoides | Crotalaria bagamoyoensis Baker f. | CRBA12 |
| Crotalaria lotifolia | Crotalaria lotifolia L. var. eggersii Senn | CRLOE |
| Crotalaria micans | Crotalaria anagyroides Kunth | CRAN15 |
| Crotalaria micans | Crotalaria brachystachys Benth. | CRBR17 |
| Crotalaria novae-hollandiae | Crotalaria crassipes Hook. | CRCR15 |
| Crotalaria pallida | Crotalaria brownei Bertero ex DC. | CRBR18 |
| Crotalaria pallida var. obovata | Crotalaria falcata Vahl ex DC. | CRFA80 |
| Crotalaria pallida var. obovata | Crotalaria mucronata Desv. | CRMU5 |
| Crotalaria pallida var. obovata | Crotalaria striata DC. | CRST7 |
| Crotalaria purshii | Crotalaria purshii DC. var. bracteolifera Fern. | CRPUB |
| Crotalaria rotundifolia | Crotalaria angulata auct. non P. Mill. [misapplied] | CRAN12 |
| Crotalaria rotundifolia | Crotalaria linaria Small | CRLI11 |
| Crotalaria rotundifolia | Crotalaria maritima Chapman | CRMA18 |
| Crotalaria rotundifolia | Crotalaria maritima Chapman var. linaria (Small) Senn | CRMAL |
| Crotalaria rotundifolia | Crotalaria rotundifolia Walt. ex J.F. Gmel. var. vulgaris Windler | CRROV |
| Crotalaria sagittalis | Crotalaria sagittalis L. var. blumeriana Senn | CRSAB |
| Crotalaria sagittalis | Crotalaria sagittalis L. var. fruticosa (P. Mill.) Fawcett & Rendle | CRSAF |
| Crotalaria sagittalis | Crotalaria sagittalis L. var. oblonga Michx. | CRSAO |
| Crotalaria senegalensis | Crotalaria maxillaris Klotzsch | CRMA22 |
| Crotalaria spectabilis | Crotalaria retzii A.S. Hitchc. | CRRE10 |
| Crotalaria spectabilis | Crotalaria sericea Retz., nom. illeg. [anomalous] | CRSE13 |
| Crotalaria stipularia | Crotalaria stipularia Desv. var. serpyllifolia DC. | CRSTS2 |
| Crotalaria trichotoma | Crotalaria usaramoensis E.G. Baker | CRUS80 |
| Crotalaria trichotoma | Crotalaria zanzibarica Benth. | CRZA80 |
| Crotalaria virgulata ssp. grantiana | Crotalaria grantiana Harvey | CRGR16 |
| crowded lupine | Lupinus confertus Kellogg | LUCO2 |
| crownvetch | Coronilla L. | CORON |
| crownvetch | Securigera varia (L.) Lassen | SEVA4 |
| crybabytree | Erythrina crista-galli L. | ERCR6 |
| Cuban ticktrefoil | Desmodium cubense Griseb. | DECU2 |
| Cullen americanum | Cullen americana (L.) Rydb. [orthographic variant] | CUAM2 |
| Cullen americanum | Psoralea americana L. | PSAM2 |
| Cullen americanum | Psoralea americana L. var. polystachya Cout. | PSAMP |
| Cullen americanum | Psoralea dentata DC. | PSDE5 |
| Cullen cinereum | Psoralea cinerea Lindl. | PSCI3 |
| Cullen corylifolia | Psoralea corylifolia L. | PSCO6 |
| Cullen graveolens | Psoralea graveolens Domin | PSGR5 |
| Cullen tenax | Psoralea tenax Lindl. | PSTE12 |
| cultivated fenugreek | Trigonella corniculata (L.) L. | TRCO7 |
| cultivated licorice | Glycyrrhiza glabra L. | GLGL |
| Cuming's stickpea | Calliandra cumingii Benth. | CACU17 |
| cup clover | Trifolium cyathiferum Lindl. | TRCY |
| currant milkvetch | Astragalus uncialis Barneby | ASUN3 |
| Curtiss's hoarypea | Tephrosia angustissima Shuttlw. ex Chapman var. curtissii (Small ex Rydb.) Isely | TEANC2 |
| Curtiss's lespedeza | Lespedeza hirta (L.) Hornem. ssp. curtissii Clewell | LEHIC |
| curvepod milkvetch | Astragalus curvicarpus (Heller) J.F. Macbr. | ASCU4 |
| curvepod milkvetch | Astragalus curvicarpus (Heller) J.F. Macbr. var. brachycodon (Barneby) Barneby | ASCUB |
| curvepod milkvetch | Astragalus curvicarpus (Heller) J.F. Macbr. var. curvicarpus | ASCUC |
| cushenbury milkvetch | Astragalus albens Greene | ASAL4 |
| cushion milkvetch | Astragalus aretioides (M.E. Jones) Barneby | ASAR3 |
| Cusick's clover | Trifolium eriocephalum Nutt. ssp. cusickii (Piper) J. Gillett | TRERC3 |
| Cusick's locoweed | Oxytropis campestris (L.) DC. var. cusickii (Greenm.) Barneby | OXCAC3 |
| Cusick's lupine | Lupinus cusickii S. Wats. | LUCU3 |
| Cusick's lupine | Lupinus cusickii S. Wats. ssp. abortivus (Greene) Cox | LUCUA |
| Cusick's lupine | Lupinus cusickii S. Wats. ssp. brachypodus (Piper) Cox | LUCUB |
| Cusick's lupine | Lupinus cusickii S. Wats. ssp. cusickii | LUCUC2 |
| Cusick's milkvetch | Astragalus cusickii Gray | ASCU5 |
| Cusick's milkvetch | Astragalus cusickii Gray var. cusickii | ASCUC2 |
| Cusick's milkvetch | Astragalus cusickii Gray var. flexilipes Barneby | ASCUF |
| cusp clover | Trifolium mucronatum Willd. ex Spreng. | TRMU3 |
| cusqui | Prosopis calingastana Burkart | PRCA10 |
| Custer milkvetch | Astragalus amnis-amissi Barneby ex C.L. Hitchc. | ASAM4 |
| cutleaf medick | Medicago laciniata (L.) P. Mill. | MELA5 |
| Cutler's milkvetch | Astragalus preussii Gray var. cutleri Barneby | ASPRC2 |
| Cutler's spurred lupine | Lupinus caudatus Kellogg ssp. cutleri (Eastw.) Hess & D. Dunn | LUCAC |
| cyamopsis | Cyamopsis DC. | CYAMO |
| Cyamopsis tetragonoloba | Cyamopsis psoralioides DC. | CYPS2 |
| cyanic milkvetch | Astragalus cyaneus Gray | ASCY |
| cyclops acacia | Acacia cyclops A. Cunningham ex G. Don | ACCY2 |
| cynometra | Cynometra L. | CYNOM |
| cynometra | Cynometra ramiflora L. | CYRA8 |
| Cyprus-vetch | Lathyrus ochrus (L.) DC. | LAOC6 |
| Cytisophyllum sessilifolius | Cytisus sessilifolius L. | CYSE9 |
| Cytisus scoparius | Sarothamnus scoparius (L.) Wimmer ex Koch | SASC6 |
| Cytisus villosus | Cytisus triflorus L'H?r. | CYTR10 |
| Dahurian lespedeza | Lespedeza daurica (Laxm.) Schindl. | LEDA3 |
| dalbergia | Dalbergia candenatensis (Dennst.) Prain | DACA18 |
| dalbergia | Dalbergia palauensis Hosokawa | DAPA7 |
| dalbergia | Dalbergia tucurensis J. D. Smith | DATU |
| Dalbergia brownei | Amerimnon brownei Jacq. | AMBR10 |
| Dalbergia brownei | Dalbergia amerimnon Benth. | DAAM3 |
| Dalbergia ecastaphyllum | Ecastaphyllum ecastaphyllum (L.) Britt. | ECEC2 |
| Dalbergia monetaria | Securidaca volubilis L. | SEVO |
| Dalbergia tucurensis | Dalbergia cubilquitzensis (J. D. Smith) Pittier | DACU3 |
| Dalby myall | Acacia stenophylla A. Cunn. ex Benth. | ACST5 |
| dalea | Psorothamnus Rydb. | PSORO |
| Dalea adenopoda | Dalea pinnata (J.F. Gmel.) Barneby var. adenopoda (Rydb.) Barneby | DAPIA |
| Dalea adenopoda | Kuhnistera adenopoda Rydb. | KUAD |
| Dalea adenopoda | Kuhnistera truncata Small | KUTR |
| Dalea adenopoda | Petalostemon adenopodus (Rydb.) Wemple | PEAD2 |
| Dalea albiflora | Dalea ordiae Gray | DAOR3 |
| Dalea albiflora | Petalostemon pilosulus Rydb. | PEPI6 |
| Dalea aurea | Parosela aurea (Nutt. ex Pursh) Britt. | PAAU4 |
| Dalea bicolor var. argyrea | Dalea argyrea Gray | DAAR5 |
| Dalea brachystachya | Dalea lemmonii Parry ex Gray | DALE4 |
| Dalea candida var. candida | Petalostemon candidus Michx. | PECA21 |
| Dalea candida var. oligophylla | Dalea occidentalis (Heller) Isely | DAOC |
| Dalea candida var. oligophylla | Dalea oligophylla (Torr.) Shinners | DAOL2 |
| Dalea candida var. oligophylla | Petalostemon candidus Michx. var. oligophyllus (Torr.) F.J. Herm. | PECAO |
| Dalea candida var. oligophylla | Petalostemon occidentalis (Heller) Fern. | PEOC2 |
| Dalea candida var. oligophylla | Petalostemon oligophyllus (Torr.) Torr. ex Smyth | PEOL3 |
| Dalea carnea var. albida | Petalostemon albidus (Torr. & Gray) Small | PEAL13 |
| Dalea carnea var. carnea | Petalostemon carneus Michx. | PECA22 |
| Dalea carnea var. gracilis | Petalostemon gracilis Nutt. | PEGR17 |
| Dalea carthagenensis var. carthagenensis | Dalea carthagenensis (Jacq.) J.F. Macbr. ssp. domingensis (DC.) Clausen | DACAD |
| Dalea carthagenensis var. carthagenensis | Parosela domingensis (DC.) Millsp. | PADO3 |
| Dalea carthagenensis var. floridana | Parosela floridana Rydb. | PAFL8 |
| Dalea cliffortiana | Parosela dalea (L.) Britt. [excluded] | PADA3 |
| Dalea compacta var. compacta | Petalostemon compactus (Spreng.) Swezey | PECO28 |
| Dalea compacta var. compacta | Petalostemon decumbens Nutt. | PEDE20 |
| Dalea compacta var. pubescens | Dalea helleri Shinners | DAHE5 |
| Dalea compacta var. pubescens | Petalostemon pulcherrimus (Heller) Heller | PEPU3 |
| Dalea cylindriceps | Petalostemon macrostachyus Torr. | PEMA21 |
| Dalea emarginata | Petalostemon emarginatus Torr. & Gray | PEEM4 |
| Dalea enneandra | Dalea enneandra Nutt. var. pumilla (Shinners) B.L. Turner | DAENP |
| Dalea enneandra | Dalea laxiflora Pursh | DALA7 |
| Dalea enneandra | Dalea laxiflora Pursh var. pumilla Shinners | DALAP |
| Dalea enneandra | Parosela enneandra (Nutt.) Britt. | PAEN2 |
| Dalea exigua | Petalostemon exilis Gray | PEEX3 |
| Dalea feayi | Petalostemon feayi Chapman | PEFE5 |
| Dalea flavescens | Dalea epica Welsh | DAEP |
| Dalea flavescens | Dalea flavescens (S. Wats.) Welsh var. epica (Welsh) Chatterley | DAFLE |
| Dalea flavescens | Petalostemon flavescens S. Wats. | PEFL9 |
| Dalea foliosa | Petalostemon foliosus Gray | PEFO5 |
| Dalea formosa | Parosela formosa Torr. | PAFO6 |
| Dalea frutescens | Dalea frutescens Gray var. laxa B.L. Turner | DAFRL |
| Dalea gattingeri | Petalostemon gattingeri (Heller) Heller | PEGA6 |
| Dalea lanata var. lanata | Parosela lanata (Spreng.) Britt. | PALA20 |
| Dalea lanata var. terminalis | Dalea glaberrima S. Wats. | DAGL3 |
| Dalea lanata var. terminalis | Dalea terminalis M.E. Jones | DATE8 |
| Dalea leporina | Dalea alopecuroides Willd. | DAAL4 |
| Dalea leporina | Dalea lagopus (Cav.) Willd. | DALA8 |
| Dalea leporina | Parosela alopecuroides (Willd.) Rydb. | PAAL16 |
| Dalea mollissima | Dalea mollis Benth. var. mollissima (Rydb.) Munz | DAMOM |
| Dalea mollissima | Dalea neomexicana (Gray) Cory ssp. mollissima (Rydb.) Wiggins | DANEM |
| Dalea multiflora | Petalostemon multiflorus Nutt. | PEMU12 |
| Dalea nana var. carnescens | Dalea nana Torr. ex Gray var. elatior Gray ex B.L. Turner | DANAE2 |
| Dalea nana var. nana | Parosela nana (Torr. ex Gray) Heller | PANA4 |
| Dalea neomexicana var. longipila | Dalea longipila (Rydb.) Cory | DALO2 |
| Dalea obovata | Petalostemon obovatus Torr. & Gray | PEOB5 |
| Dalea ornata | Petalostemon ornatus Dougl. ex Hook. | PEOR7 |
| Dalea phleoides var. microphylla | Dalea drummondiana Shinners | DADR |
| Dalea phleoides var. microphylla | Petalostemon microphyllus (Torr. & Gray) Heller | PEMI14 |
| Dalea phleoides var. microphylla | Petalostemon phleoides Torr. & Gray var. microphyllus (Torr. & Gray) Barneby | PEPHM |
| Dalea phleoides var. phleoides | Petalostemon glandulosus Coult. & Fisher | PEGL15 |
| Dalea phleoides var. phleoides | Petalostemon phleoides Torr. & Gray | PEPH3 |
| Dalea pinnata var. pinnata | Kuhnistera pinnata (J.F. Gmel.) Kuntze | KUPI |
| Dalea pinnata var. pinnata | Petalostemon caroliniensis (Lam.) Sprague | PECA23 |
| Dalea pinnata var. pinnata | Petalostemon pinnatus (J.F. Gmel.) Blake | PEPI5 |
| Dalea pinnata var. trifoliata | Petalostemon pinnatus (J.F. Gmel.) Blake ssp. trifoliatus (Chapman) Wemple | PEPIT |
| Dalea polygonoides | Dalea polygonoides Gray var. anomala (M.E. Jones) Morton | DAPOA |
| Dalea purpurea var. arenicola | Petalostemon arenicola Wemple | PEAR9 |
| Dalea purpurea var. purpurea | Petalostemon mollis Rydb. | PEMO9 |
| Dalea purpurea var. purpurea | Petalostemon purpureus (Vent.) Rydb. | PEPU15 |
| Dalea purpurea var. purpurea | Petalostemon purpureus (Vent.) Rydb. var. mollis (Rydb.) Boivin | PEPUM |
| Dalea reverchonii | Petalostemon reverchonii S. Wats. | PERE9 |
| Dalea sabinalis | Petalostemon sabinalis S. Wats. | PESA14 |
| Dalea scandens var. paucifolia | Dalea thyrsiflora Gray | DATH4 |
| Dalea scariosa | Petalostemon prostratus Woot. & Standl. | PEPR8 |
| Dalea scariosa | Petalostemon scariosus (S. Wats.) Wemple | PESC6 |
| Dalea searlsiae | Petalostemon searlsiae Gray | PESE14 |
| Dalea tenuifolia | Petalostemon tenuifolius Gray | PETE16 |
| Dalea tenuis | Petalostemon stanfieldii Small | PEST10 |
| Dalea tenuis | Petalostemon tenuis (Coult.) Heller | PETE13 |
| Dalea versicolor ssp. versicolor var. sessilis | Dalea wislizeni Gray ssp. sessilis (Gray) H.C. Gentry | DAWIS |
| Dalea versicolor ssp. versicolor var. sessilis | Dalea wislizeni Gray var. sanctae-crucis (Rydb.) Kearney & Peebles | DAWIS2 |
| Dalea versicolor var. glabrescens | Dalea wislizeni Gray [excluded] | DAWI2 |
| Dalea villosa var. grisea | Petalostemon griseus Torr. & Gray | PEGR19 |
| Dalea villosa var. villosa | Petalostemon villosus Nutt. | PEVI12 |
| Dalea virgata | Dalea oaxacana (Rose) Bullock | DAOA |
| Dalmatian clover | Trifolium dalmaticum Vis. | TRDA4 |
| danglepod | Sesbania emerus (Aubl.) Urban | SEEM |
| daniellia | Daniellia Bennett | DANIE |
| Davidson's bird's-foot trefoil | Lotus nevadensis (S. Wats.) Greene var. davidsonii (Greene) Isely | LONED2 |
| dead finish | Acacia tetragonophylla F. Muell. | ACTE8 |
| Deane's milkvetch | Astragalus deanei (Rydb.) Barneby | ASDE |
| Deane's wattle | Acacia deanei (R. T. Baker) M. B. Welch et al. | ACDE11 |
| Debeque milkvetch | Astragalus debequaeus Welsh | ASDE11 |
| debris milkvetch | Astragalus detritalis M.E. Jones | ASDE5 |
| Dedecker lupine | Lupinus padre-crowleyi C.P. Sm. | LUPA6 |
| Dedecker's clover | Trifolium dedeckerae J. Gillett | TRDE4 |
| Del Norte pea | Lathyrus delnorticus C.L. Hitchc. | LADE3 |
| delonix | Delonix Raf. | DELON |
| Delonix regia | Poinciana regia Bojer ex Hook. | PORE12 |
| Delta tule pea | Lathyrus jepsonii Greene | LAJE |
| Delta tule pea | Lathyrus jepsonii Greene ssp. jepsonii | LAJEJ |
| Dendrolobium lanceolatum | Desmodium lanceolatum (Dunn) Schindl. ex Gagnep., nom. illeg. [anomalous] | DELA10 |
| dense cassia | Senna artemisioides (Gaud. ex DC.) Randell ssp. ?sturtii (R. Br.) Randell | SEARS2 |
| depauperate milkvetch | Astragalus pauperculus Greene | ASPA15 |
| depressed lupine | Lupinus depressus Rydb. | LUDE3 |
| derris | Derris elliptica (Wallich) Benth. | DEEL3 |
| derris | Derris ferruginea (Roxb.) Benth. | DEFE3 |
| derris | Derris Lour. | DERRI |
| Derris trifoliata | Derris uliginosa (Willd.) Benth. | DEUL2 |
| Descanso milkvetch | Astragalus oocarpus Gray | ASOO2 |
| deseret milkvetch | Astragalus desereticus Barneby | ASDE2 |
| desert deervetch | Lotus micranthus Benth. | LOMI |
| desert false indigo | Amorpha fruticosa L. | AMFR |
| desert ironwood | Olneya tesota Gray | OLTE |
| desert lupine | Lupinus aridus Dougl. | LUAR7 |
| desert lupine | Lupinus aridus Dougl. ssp. aridus | LUARA6 |
| desert lupine | Lupinus aridus Dougl. ssp. lenorensis (C.P. Sm.) Cox | LUARL |
| desert lupine | Lupinus aridus Dougl. ssp. loloensis Cox | LUARL2 |
| desert mimosa | Mimosa turneri Barneby | MITU |
| desertsenna | Senna armata (S. Wats.) Irwin & Barneby | SEAR8 |
| Desmanthus acuminatus | Desmanthus virgatus (L.) Willd. var. acuminatus (Benth.) Isely | DEVIA |
| Desmanthus glandulosus | Desmanthus virgatus (L.) Willd. var. glandulosus B.L. Turner | DEVIG |
| Desmanthus illinoensis | Acuan illinoense (Michx.) Kuntze | ACIL2 |
| Desmanthus illinoensis | Mimosa illinoensis Michx. | MIIL |
| Desmanthus leptolobus | Acuan leptolobum (Torr. & Gray) Kuntze | ACLE4 |
| Desmanthus tatuhyensis var. brevipes | Desmanthus brevipes B.L. Turner | DEBR3 |
| Desmanthus virgatus | Acuan depressum (Humb. & Bonpl. ex Willd.) Kuntze | ACDE8 |
| Desmanthus virgatus | Acuan virgatum (L.) Medik. | ACVI3 |
| Desmanthus virgatus | Desmanthus depressus Humb. & Bonpl. ex Willd. | DEDE3 |
| Desmanthus virgatus | Desmanthus virgatus (L.) Willd. var. depressus (Humb. & Bonpl. ex Willd.) B.L. Turner | DEVID |
| Desmanthus virgatus | Desmanthus virgatus (L.) Willd. var. virgatus (L.) Willd. [superfluous autonym] | DEVIV |
| Desmodium adscendens | Desmodium ovalifolium Guillemin & Perrottet | DEOV2 |
| Desmodium adscendens | Meibomia adscendens (Sw.) Kuntze | MEAD2 |
| Desmodium affine | Meibomia affinis (Schlecht.) Kuntze | MEAF3 |
| Desmodium angustifolium | Meibomia angustifolia (Kunth) Kuntze [excluded] | MEAN8 |
| Desmodium arizonicum | Meibomia arizonica (S. Wats.) Vail | MEAR12 |
| Desmodium axillare var. acutifolium | Meibomia umbrosa Britt. | MEUM4 |
| Desmodium axillare var. axillare | Desmodium axillare (Sw.) DC. var. obtusifolium (Kuntze) Urban | DEAXO |
| Desmodium axillare var. axillare | Meibomia axillaris (Sw.) Kuntze | MEAX |
| Desmodium axillare var. axillare | Meibomia axillaris (Sw.) Kuntze var. obtusifolia Kuntze | MEAXO |
| Desmodium axillare var. stoloniferum | Desmodium axillare (Sw.) DC. var. sintenisii Urban | DEAXS2 |
| Desmodium axillare var. stoloniferum | Meibomia sintenisii (Urban) Britt. | MESI3 |
| Desmodium barbatum | Meibomia barbata (L.) Kuntze | MEBA5 |
| Desmodium batocaulon | Meibomia batocaulis (Gray) Kuntze | MEBA6 |
| Desmodium canadense | Meibomia canadensis (L.) Kuntze | MECA14 |
| Desmodium canescens | Desmodium canescens (L.) DC. var. hirsutum (Hook.) B.L. Robins. | DECAH |
| Desmodium canescens | Desmodium canescens (L.) DC. var. villosissimum Torr. & Gray | DECAV3 |
| Desmodium canescens | Meibomia canescens (L.) Kuntze | MECA16 |
| Desmodium ciliare var. ciliare | Meibomia ciliaris (Muhl. ex Willd.) Blake | MECI7 |
| Desmodium cinerascens | Meibomia cinerascens (Gray) Kuntze | MECI8 |
| Desmodium cubense | Meibomia cubensis (Griseb.) Schindl. | MECU2 |
| Desmodium cuspidatum var. cuspidatum | Desmodium bracteosum (Michx.) DC. | DEBR5 |
| Desmodium cuspidatum var. cuspidatum | Desmodium grandiflorum DC. | DEGR4 |
| Desmodium cuspidatum var. cuspidatum | Hedysarum grandiflorum Walt., non Pall. | HEGR80 |
| Desmodium cuspidatum var. cuspidatum | Meibomia bracteosa (Michx.) Kuntze | MEBR3 |
| Desmodium cuspidatum var. cuspidatum | Meibomia grandiflora (DC.) Kuntze | MEGR4 |
| Desmodium cuspidatum var. longifolium | Desmodium bracteosum (Michx.) DC. var. longifolium (Torr. & Gray) B.L. Robins. | DEBRL |
| Desmodium cuspidatum var. longifolium | Desmodium longifolium (Torr. & Gray) Smyth | DELO |
| Desmodium cuspidatum var. longifolium | Meibomia longifolia (Torr. & Gray) Vail | MELO6 |
| Desmodium elegans | Desmodium tiliifolium (D. Don) G. Don | DETI2 |
| Desmodium fernaldii | Desmodium rhombifolium auct. non Ell. [misapplied] | DERH |
| Desmodium fernaldii | Meibomia rhombifolia sensu Vail | MERH |
| Desmodium floridanum | Meibomia floridana (Chapman) Kuntze | MEFL2 |
| Desmodium floridanum | Meibomia rhombifolia Vail p.p. | MERH2 |
| Desmodium glabellum | Desmodium dillenii Darl. p.p. | DEDI2 |
| Desmodium glabellum | Meibomia glabella (Michx.) Kuntze | MEGL4 |
| Desmodium glabrum | Desmodium molle (Vahl) DC. | DEMO2 |
| Desmodium glabrum | Hedysarum molle Vahl | HEMO10 |
| Desmodium glabrum | Meibomia glabra (P. Mill.) Kuntze | MEGL3 |
| Desmodium glabrum | Meibomia mollis (Vahl) Kuntze | MEMO7 |
| Desmodium glutinosum | Desmodium acuminatum (Michx.) DC. | DEAC2 |
| Desmodium glutinosum | Meibomia acuminata (Michx.) Blake | MEAC2 |
| Desmodium glutinosum | Meibomia grandiflora auct. non (Walt.) Kuntze [misapplied] | MEGR6 |
| Desmodium grahamii | Meibomia grahamii (Gray) Kuntze | MEGR7 |
| Desmodium gramineum | Desmodium angustifolium (Kunth) DC. var. gramineum (Gray) Schub. | DEANG |
| Desmodium gramineum | Meibomia graminea (Gray) Kuntze | MEGR5 |
| Desmodium heterocarpon ssp. heterocarpon | Desmodium polycarpon (Poir.) DC. | DEPO4 |
| Desmodium humifusum | Meibomia humifusa (Muhl. ex Bigelow) Kuntze | MEHU3 |
| Desmodium illinoense | Meibomia illinoensis (Gray) Kuntze | MEIL |
| Desmodium incanum var. angustifolium | Desmodium canum (J.F. Gmel.) Schinz & Thellung var. angustifolium (Griseb.) L?on & Alain | DECAA |
| Desmodium incanum var. incanum | Desmodium canum (J.F. Gmel.) Schinz & Thellung | DECA13 |
| Desmodium incanum var. incanum | Desmodium frutescens Schindl. | DEFR2 |
| Desmodium incanum var. incanum | Desmodium supinum DC. | DESU4 |
| Desmodium incanum var. incanum | Meibomia cana (J.F. Gmel.) Blake | MECA15 |
| Desmodium incanum var. incanum | Meibomia incana (DC.) Vail | MEIN9 |
| Desmodium incanum var. incanum | Meibomia supina Britt. | MESU6 |
| Desmodium intortum | Meibomia intorta (P. Mill.) Blake | MEIN10 |
| Desmodium laevigatum | Meibomia laevigata (Nutt.) Kuntze | MELA8 |
| Desmodium lindheimeri | Meibomia lindheimeri (Vail) Vail | MELI11 |
| Desmodium lineatum | Desmodium arenicola (Vail) F.J. Herm. | DEAR6 |
| Desmodium lineatum | Desmodium lineatum DC. var. polymorphum Gray | DELIP |
| Desmodium lineatum | Meibomia arenicola Vail | MEAR11 |
| Desmodium lineatum | Meibomia lineata (DC.) Kuntze | MELI10 |
| Desmodium lineatum | Meibomia lineata (DC.) Kuntze var. polymorpha (Gray) Vail | MELIP3 |
| Desmodium lineatum | Meibomia polymorpha (Gray) Small | MEPO4 |
| Desmodium marilandicum | Meibomia marilandica (L.) Kuntze | MEMA9 |
| Desmodium metcalfei | Meibomia metcalfei Rose & Painter | MEME3 |
| Desmodium neomexicanum | Meibomia neomexicana (Gray) Kuntze | MENE5 |
| Desmodium nudiflorum | Meibomia nudiflora (L.) Kuntze | MENU2 |
| Desmodium nuttallii | Meibomia nuttallii Schindl. | MENU3 |
| Desmodium obtusum | Desmodium rigidum (Ell.) DC. | DERI3 |
| Desmodium obtusum | Meibomia obtusa (Muhl. ex Willd.) Vail | MEOB6 |
| Desmodium obtusum | Meibomia rigida (Ell.) Kuntze | MERI |
| Desmodium ochroleucum | Meibomia ochroleuca (M.A. Curtis ex Canby) Kuntze | MEOC |
| Desmodium paniculatum var. paniculatum | Desmodium dichromum Shinners | DEDI4 |
| Desmodium paniculatum var. paniculatum | Desmodium paniculatum (L.) DC. var. angustifolium Torr. & Gray | DEPAA |
| Desmodium paniculatum var. paniculatum | Desmodium paniculatum (L.) DC. var. pubens Torr. & Gray | DEPAP9 |
| Desmodium paniculatum var. paniculatum | Meibomia chapmanii (Britt.) Small | MECH3 |
| Desmodium paniculatum var. paniculatum | Meibomia paniculata (L.) Kuntze | MEPA10 |
| Desmodium paniculatum var. paniculatum | Meibomia pubens (Torr. & Gray) Rydb. | MEPU5 |
| Desmodium pauciflorum | Meibomia pauciflora (Nutt.) Kuntze | MEPA9 |
| Desmodium perplexum | Desmodium dillenii Darl. | DEDI5 |
| Desmodium perplexum | Desmodium paniculatum (L.) DC. var. dillenii (Darl.) Isely | DEPAD2 |
| Desmodium perplexum | Meibomia dillenii (Darl.) Kuntze | MEDI8 |
| Desmodium podocarpum ssp. oxyphyllum | Desmodium racemosum DC. | DERA4 |
| Desmodium procumbens var. procumbens | Desmodium spirale DC. | DESP |
| Desmodium procumbens var. procumbens | Desmodium sylvaticum Benth. | DESY |
| Desmodium procumbens var. procumbens | Meibomia procumbens (P. Mill.) Britt. | MEPR3 |
| Desmodium procumbens var. procumbens | Meibomia procumbens (P. Mill.) Britt. var. sylvatica (Benth.) Schindl. | MEPRS |
| Desmodium procumbens var. procumbens | Meibomia spiralis Kuntze | MESP7 |
| Desmodium psilophyllum | Desmodium wrightii Gray | DEWR3 |
| Desmodium psilophyllum | Meibomia psilophylla (Schlecht.) Kuntze | MEPS2 |
| Desmodium retinens | Desmodium wislizeni Engelm. ex Gray | DEWI |
| Desmodium retinens | Meibomia retinens (Schlecht.) Kuntze | MERE6 |
| Desmodium retinens | Meibomia wrightii (Engelm. ex Gray) Kuntze | MEWR3 |
| Desmodium rotundifolium | Desmodium michauxii (Vail) Daniels | DEMI |
| Desmodium rotundifolium | Meibomia michauxii Vail | MEMI5 |
| Desmodium rotundifolium | Meibomia rotundifolia (DC.) Kuntze | MERO4 |
| Desmodium sandwicense | Desmodium uncinatum auct. non (Jacq.) DC. [misapplied] | DEUN |
| Desmodium sandwicense | Meibomia uncinata auct. non (Jacq.) Kuntze [misapplied] | MEUN |
| Desmodium scopulorum | Desmodium wigginsii Schub. | DEWI2 |
| Desmodium scorpiurus | Meibomia scorpiurus (Sw.) Kuntze | MESC5 |
| Desmodium sessilifolium | Meibomia sessilifolia (Torr.) Kuntze | MESE3 |
| Desmodium strictum | Meibomia stricta (Pursh) Kuntze | MEST7 |
| Desmodium styracifolium | Desmodium capitatum (Burm. f.) DC. | DECA20 |
| Desmodium tenuifolium | Meibomia tenuifolia (Torr. & Gray) Kuntze | METE4 |
| Desmodium tortuosum | Desmodium annuum Gray p.p. | DEAN4 |
| Desmodium tortuosum | Desmodium purpureum (P. Mill.) Fawcett & Rendle | DEPU7 |
| Desmodium tortuosum | Meibomia purpurea (P. Mill.) Vail | MEPU6 |
| Desmodium tortuosum | Meibomia tortuosa (Sw.) Kuntze | METO6 |
| Desmodium triflorum | Meibomia triflora (L.) Kuntze | METR8 |
| Desmodium triflorum | Sagotia triflora (L.) Duchass. & Walp. | SATR8 |
| Desmodium tweedyi | Meibomia tweedyi (Britt.) Vail | METW |
| Desmodium viridiflorum | Meibomia viridiflora (L.) Kuntze | MEVI8 |
| Desmodium wydlerianum | Meibomia wydleriana (Urban) Britt. | MEWY |
| dialium | Dialium L. | DIALI |
| dichrostachys | Dichrostachys (DC.) Wight & Arn. | DICHR2 |
| Dichrostachys cinerea | Cailliea glomerata (Forssk.) J.F. Macbr. | CAGL20 |
| Dichrostachys cinerea | Dichrostachys nutans Benth. | DINU6 |
| Diehl's milkvetch | Astragalus flexuosus (Hook.) Dougl. ex G. Don var. diehlii (M.E. Jones) Barneby | ASFLD |
| diffuse clover | Trifolium diffusum Ehrh. | TRDI15 |
| Dillenius's ticktrefoil | Desmodium glabellum (Michx.) DC. | DEGL4 |
| Dillwynia retorta | Dillwynia ericifolia Sm. | DIER7 |
| Dinosaur milkvetch | Astragalus saurinus Barneby | ASSA5 |
| dioclea | Dioclea Kunth | DIOCL |
| Dioclea bicolor | Dolichos bicolor Hoffmanns. ex Steud. | DOBI5 |
| Dioclea hexandra | Dioclea reflexa Hook. f. | DIRE5 |
| Dioclea multiflora | Galactia mohlenbrockii R.H. Maxwell | GAMO4 |
| diphysa | Diphysa Jacq. | DIPHY |
| dipogon | Dipogon Lieb. | DIPOG |
| Dipogon lignosus | Dolichos lignosus L. | DOLI2 |
| dipteryx | Dipteryx Schreber | DIPTE |
| Dipteryx odorata | Coumarouna odora Aublet [orthographic variant] | COOD5 |
| Dipteryx odorata | Coumarouna odorata Aublet | COOD6 |
| divi divi | Caesalpinia coriaria (Jacq.) Willd. | CACO28 |
| dixie ticktrefoil | Desmodium tortuosum (Sw.) DC. | DETO |
| Dolichos sericeus ssp. formosus | Dolichos formosus Hochst. ex A. Rich. | DOFO2 |
| Dolichos trilobus | Dolichos falcatus Klein ex Willd. | DOFA2 |
| dollarleaf | Rhynchosia reniformis DC. | RHRE |
| Donner Lake lupine | Lupinus sellulus Kellogg | LUSE2 |
| Donner Lake lupine | Lupinus sellulus Kellogg ssp. sellulus | LUSES |
| Donner Lake lupine | Lupinus sellulus Kellogg ssp. sellulus var. artulus (Jepson) Eastw. | LUSEA2 |
| Donner Lake lupine | Lupinus sellulus Kellogg ssp. sellulus var. lobbii (Gray ex S. Wats.) Cox | LUSEL2 |
| Donner Lake lupine | Lupinus sellulus Kellogg ssp. sellulus var. medius (Detling) Cox | LUSEM4 |
| Donner Lake lupine | Lupinus sellulus Kellogg ssp. sellulus var. sellulus | LUSES3 |
| Donner Lake lupine | Lupinus sellulus Kellogg ssp. ursinus (Eastw.) Munz | LUSEU |
| Dorycnium pentaphyllum ssp. germanicum | Dorycnium germanicum (Gremli) Rouy | DOGE3 |
| Dorycnium pentaphyllum ssp. herbaceum | Dorycnium herbaceum Vill. | DOHE3 |
| Dorycnium pentaphyllum ssp. herbaceum | Dorycnium intermedium Ledeb. | DOIN3 |
| dos hoja zazabacoa de dos hojas | Zornia gemella Vogel | ZOGE |
| dotted lancepod | Lonchocarpus punctatus Kunth | LOPU4 |
| doubleform snoutbean | Rhynchosia difformis (Ell.) DC. | RHDI2 |
| Douglas's bird's-foot trefoil | Lotus nevadensis (S. Wats.) Greene var. douglasii (Greene) Ottley | LONED |
| Douglas's clover | Trifolium douglasii House | TRDO |
| Douglas's silver lupine | Lupinus albifrons Benth. ex Lindl. var. douglasii (J.G. Agardh) C.P. Sm. | LUALD |
| Douglas's spiny milkvetch | Astragalus kentrophyta Gray var. douglasii Barneby | ASKED2 |
| downy beach pea | Lathyrus japonicus Willd. var. pubescens Hartman | LAJAP3 |
| downy milkpea | Galactia volubilis (L.) Britt. | GAVO |
| downy prairie clover | Dalea neomexicana (Gray) Cory | DANE |
| downy prairie clover | Dalea neomexicana (Gray) Cory var. longipila (Rydb.) Barneby | DANEL |
| downy prairie clover | Dalea neomexicana (Gray) Cory var. neomexicana | DANEN |
| Dragon milkvetch | Astragalus lutosus M.E. Jones | ASLU2 |
| dragonsblood tree | Pterocarpus officinalis Jacq. | PTOF |
| Drew's silky lupine | Lupinus adsurgens E. Drew | LUAD |
| Drew's silky lupine | Lupinus adsurgens E. Drew var. adsurgens | LUADA |
| Drew's silky lupine | Lupinus adsurgens E. Drew var. lilacinus Heller ex C.P. Sm. | LUADL |
| Drew's silky lupine | Lupinus adsurgens E. Drew var. undulatus C.P. Sm. | LUADU |
| droopflower clover | Trifolium longipes Nutt. ssp. reflexum (A. Nels.) J. Gillett | TRLOR3 |
| drooping milkvetch | Astragalus reflexus Torr. & Gray | ASRE3 |
| drooping wattle | Acacia difformis R. T. Baker | ACDI8 |
| Drummond's milkvetch | Astragalus drummondii Dougl. ex Hook. | ASDR3 |
| Drummond's wattle | Acacia drummondii Lindl. | ACDR2 |
| drypark pea | Lathyrus bijugatus White | LABI2 |
| Duane's milkvetch | Astragalus pinonis M.E. Jones var. atwoodii (Welsh & Thorne) Barneby & Isely | ASPIA |
| Duchesne milkvetch | Astragalus duchesnensis M.E. Jones | ASDU2 |
| dunchi fiber | Sesbania bispinosa (Jacq.) W. Wight | SEBI3 |
| dunebroom | Errazurizia Phil. | ERRAZ |
| Durango senna | Senna durangensis (Rose) Irwin & Barneby | SEDU |
| Durango senna | Senna durangensis (Rose) Irwin & Barneby var. durangensis (Rose) Irwin & Barneby [excluded] | SEDUD |
| dwarf bundleflower | Desmanthus tatuhyensis Hoehne | DETA |
| dwarf bundleflower | Desmanthus tatuhyensis Hoehne var. brevipes (B.L. Turner) Luckow | DETAB |
| dwarf clover | Trifolium minutissimum Heller & Zoh. | TRMI20 |
| dwarf clover | Trifolium nanum Torr. | TRNA2 |
| dwarf erythrina | Erythrina humeana Spreng. | ERHU4 |
| dwarf false indigo | Amorpha nana Nutt. | AMNA |
| dwarf milkvetch | Astragalus microcystis Gray | ASMI4 |
| dwarf mountain lupine | Lupinus lyallii Gray | LULY |
| dwarf mountain lupine | Lupinus lyallii Gray ssp. alcis-temporis (C.P. Sm.) Cox | LULYA |
| dwarf mountain lupine | Lupinus lyallii Gray ssp. lyallii | LULYL |
| dwarf mountain lupine | Lupinus lyallii Gray ssp. lyallii var. danaus (Gray) S. Wats. | LULYD2 |
| dwarf mountain lupine | Lupinus lyallii Gray ssp. lyallii var. fruticulosus (Greene) C.P. Sm. | LULYF2 |
| dwarf mountain lupine | Lupinus lyallii Gray ssp. lyallii var. lyallii | LULYL2 |
| dwarf mountain lupine | Lupinus lyallii Gray ssp. lyallii var. macroflorus Cox | LULYM3 |
| dwarf mountain lupine | Lupinus lyallii Gray ssp. lyallii var. villosus Jepson | LULYV2 |
| dwarf mountain lupine | Lupinus lyallii Gray ssp. minutifolius (Eastw.) Cox | LULYM2 |
| dwarf mountain lupine | Lupinus lyallii Gray ssp. subpandens C.P. Sm. ex D. Dunn | LULYS |
| dwarf nicker | Hoffmannseggia drummondii Torr. & Gray | HODR3 |
| dwarf peashrub | Caragana aurantiaca Koehne | CAAU10 |
| dwarf prairie clover | Dalea nana Torr. ex Gray | DANA |
| dwarf prairie clover | Dalea nana Torr. ex Gray var. carnescens Kearney & Peebles | DANAC |
| dwarf prairie clover | Dalea nana Torr. ex Gray var. nana | DANAN |
| dwarf senna | Senna pumilio (Gray) Irwin & Barneby | SEPU13 |
| dwarf stickpea | Calliandra humilis Benth. | CAHU |
| dwarf stickpea | Calliandra humilis Benth. var. humilis | CAHUH |
| dwarf stickpea | Calliandra humilis Benth. var. reticulata (Gray) L. Benson | CAHUR |
| dwarf white milkvetch | Astragalus didymocarpus Hook. & Arn. | ASDI3 |
| dwarf white milkvetch | Astragalus didymocarpus Hook. & Arn. var. didymocarpus | ASDID2 |
| dwarf white milkvetch | Astragalus didymocarpus Hook. & Arn. var. dispermus (Gray) Jepson | ASDID |
| dwarf white milkvetch | Astragalus didymocarpus Hook. & Arn. var. milesianus (Rydb.) Jepson | ASDIM |
| dyebush | Psorothamnus emoryi (Gray) Rydb. | PSEM |
| Dyer's greenweed | Genista tinctoria L. | GETI |
| Dyer's greenweed | Genista tinctoria L. var. tinctoria | GETIT |
| earleaf acacia | Acacia auriculiformis A. Cunningham ex Benth. | ACAU |
| early wattle | Acacia genistifolia Link | ACGE8 |
| East African copal | Hymenaea verrucosa Gaertner | HYVE8 |
| East Indian island pea | Christia verspertilionis (L. f.) Bakh. f. | CHVE6 |
| eastern milkpea | Galactia regularis (L.) B.S.P. | GARE2 |
| eastern redbud | Cercis canadensis L. | CECA4 |
| eastern redbud | Cercis canadensis L. var. canadensis | CECAC |
| eastern sensitive plant | Mimosa rupertiana B.L. Turner | MIRU5 |
| eastern trailing ticktrefoil | Desmodium humifusum (Muhl. ex Bigelow) Beck | DEHU3 |
| Eastwood's milkvetch | Astragalus eastwoodiae M.E. Jones | ASEA2 |
| Ebenopsis confinis | Pithecellobium confine Standl. | PICO7 |
| Ebenopsis ebano | Chloroleucon ebano (Berl.) L. Rico | CHEB |
| Ebenopsis ebano | Mimosa ebano Berl. | MIEB |
| Ebenopsis ebano | Pithecellobium ebano (Berl.) C.H. Muller | PIEB2 |
| Ebenopsis ebano | Pithecellobium flexicaule (Benth.) Coult. | PIFL3 |
| ebony coccuswood | Brya ebenus (L.) DC. | BREB |
| edible milkpea | Galactia marginalis Benth. | GAMA2 |
| Edwards Plateau hoarypea | Tephrosia potosina Brandeg. | TEPO |
| Edwards Plateau milkvetch | Astragalus pleianthus (Shinners) Isely | ASPL8 |
| egg milkvetch | Astragalus oophorus S. Wats. | ASOO3 |
| egg milkvetch | Astragalus oophorus S. Wats. var. caulescens (M.E. Jones) M.E. Jones | ASOOC |
| egg milkvetch | Astragalus oophorus S. Wats. var. clokeyanus Barneby | ASOOC2 |
| egg milkvetch | Astragalus oophorus S. Wats. var. lonchocalyx Barneby | ASOOL |
| egg milkvetch | Astragalus oophorus S. Wats. var. oophorus | ASOOO2 |
| Eggers's milkpea | Galactia eggersii Urban | GAEG |
| Eggleston's milkvetch | Astragalus egglestonii (Rydb.) Kearney & Peebles | ASEG |
| Egyptian clover | Trifolium alexandrinum L. | TRAL6 |
| Egyptian riverhemp | Sesbania sesban (L.) Merr. | SESE8 |
| Egyptian riverhemp | Sesbania sesban (L.) Merr. var. sesban | SESES3 |
| elegant lupine | Lupinus elegans Kunth | LUEL4 |
| elegant milkvetch | Astragalus eucosmus B.L. Robins. | ASEU2 |
| elegant mimosa | Mimosa arenosa (Willd.) Poir. | MIAR4 |
| Elizabeth's milkvetch | Astragalus desperatus M.E. Jones var. neeseae Barneby | ASDEN |
| Elliott's milkpea | Galactia elliottii Nutt. | GAEL2 |
| Ellis's stinking milkvetch | Astragalus praelongus Sheldon var. ellisiae (Rydb.) Barneby | ASPRE |
| Elmer's clover | Trifolium longipes Nutt. ssp. elmeri (Greene) J. Gillett | TRLOE |
| Elmer's lupine | Lupinus elmeri Greene | LUEL2 |
| Emory's milkvetch | Astragalus emoryanus (Rydb.) Cory | ASEM2 |
| Emory's milkvetch | Astragalus emoryanus (Rydb.) Cory var. emoryanus | ASEME |
| Emory's milkvetch | Astragalus emoryanus (Rydb.) Cory var. terlinguensis (Cory) Barneby | ASEMT |
| Emory's mimosa | Mimosa emoryana Benth. | MIEM |
| emperor's candlesticks | Senna alata (L.) Roxb. | SEAL4 |
| Englemann's milkvetch | Astragalus distortus Torr. & Gray var. engelmannii (Sheldon) M.E. Jones | ASDIE |
| Entada polystachya var. polyphylla | Entada polyphylla Benth. | ENPO2 |
| Entada polystachya var. polyphylla | Entadopsis polyphylla (Benth.) Britt. | ENPO |
| enterolobium | Enterolobium Mart. | ENTER |
| Enterolobium cyclocarpum | Mimosa cyclocarpa Jacq. | MICY |
| erect milkpea | Galactia erecta (Walt.) Vail | GAER |
| Eriosema jurionianum | Eriosema polystachyum Baker, nom. illeg. [anomalous] | ERPO13 |
| Errazurizia rotundata | Parryella rotundata Woot. | PARO5 |
| erythrina | Erythrina abyssinica Lam. ex DC. | ERAB6 |
| erythrina | Erythrina L. | ERYTH |
| erythrina | Erythrina subumbrans (Hassk.) Merr. | ERSU15 |
| Erythrina crista-galli | Micropteryx crista-galli (L.) Walp. | MICR |
| Erythrina eggersii | Erythrina horrida Eggers | ERHO11 |
| Erythrina fusca | Erythrina caffra Thunb. | ERCA39 |
| Erythrina fusca | Erythrina glauca Willd. | ERGL7 |
| Erythrina fusca | Erythrina viarum Tod. | ERVI20 |
| Erythrina herbacea | Erythrina arborea (Chapman) Small | ERAR24 |
| Erythrina humeana | Erythrina princeps A. Dietr. | ERPR18 |
| Erythrina sandwicensis | Erythrina sandwicensis O. Deg. var. luteosperma St. John | ERSAL |
| Erythrina sandwicensis | Erythrina tahitensis auct. p.p., non Nadeaud | ERTA2 |
| Erythrina subumbrans | Erythrina lithosperma Miq. | ERLI7 |
| Erythrina variegata | Erythrina indica Lam. | ERIN13 |
| Erythrophleum suaveolens | Erythrophleum guineense G. Don | ERGU |
| escabon | Chamaecytisus prolifera (L. f.) Link | CHPR14 |
| Escalante milkvetch | Astragalus newberryi Gray var. escalantinus Barneby | ASNEE |
| escarpment milkvetch | Astragalus striatiflorus M.E. Jones | ASST6 |
| Ethiopian rattlebox | Crotalaria brevidens Benth. | CRBR8 |
| Ethiopian rattlebox | Crotalaria brevidens Benth. var. brevidens | CRBRB |
| Ethiopian rattlebox | Crotalaria brevidens Benth. var. intermedia (Kotschy) Polhill | CRBRI |
| Eureka milkvetch | Astragalus eurekensis M.E. Jones | ASEU4 |
| European milkvetch | Astragalus hamosus L. | ASHA13 |
| European vetch | Vicia ?disperma DC. | VIDI |
| European yellow lupine | Lupinus luteus L. | LULU80 |
| Eve's necklacepod | Styphnolobium affine (Torr. & Gray) Walp. | STAF4 |
| Everglade Key pencilflower | Stylosanthes calcicola Small | STCA7 |
| Evermann's lupine | Lupinus evermannii Rydb. | LUEV |
| Eysenhardtia orthocarpa | Eysenhardtia polystachya auct. non (Ortega) Sarg. [misapplied] | EYPO |
| Eysenhardtia texana | Eysenhardtia angustifolia Pennell | EYAN2 |
| Faidherbia albida | Acacia albida Del. | ACAL15 |
| Fairfield milkvetch | Astragalus atratus S. Wats. var. inseptus Barneby | ASATI |
| fairyduster | Calliandra eriophylla Benth. | CAER |
| Falcataria moluccana | Albizia falcata auct. | ALFA6 |
| Falcataria moluccana | Albizia falcataria (L.) Fosberg | ALFA5 |
| Falcataria moluccana | Paraserianthes falcataria (L.) I. Nielsen | PAFA8 |
| false indigo | Amorpha L. | AMORP |
| false locust | Hebestigma cubense (Kunth) Urban | HECU10 |
| false prairie-clover | Marina Liebm. | MARIN |
| false sicklepod | Senna multijuga (L.C. Rich.) Irwin & Barneby | SEMU5 |
| false tamarind | Lysiloma Benth. | LYSIL |
| false tamarind | Lysiloma latisiliquum (L.) Benth. | LYLA3 |
| false tick trefoil | Codariocalyx gyroides (Roxb. ex Link) Hassk. | COGY |
| featherplume | Dalea formosa Torr. | DAFO |
| Feay's prairie clover | Dalea feayi (Chapman) Barneby | DAFE2 |
| feefee | Centrosema plumieri (Turp. ex Pers.) Benth. | CEPL |
| fenugreek | Trigonella L. | TRIGO |
| fern-leaf acacia | Acacia pennatula (Schltdl. & Cham.) Benth. | ACPE9 |
| Fernald's ticktrefoil | Desmodium fernaldii Schub. | DEFE |
| Ferris's milkvetch | Astragalus tener Gray var. ferrisiae A. Liston | ASTEF |
| Ferron's milkvetch | Astragalus musiniensis M.E. Jones | ASMU3 |
| fevertree | Acacia xanthophloea Benth. | ACXA3 |
| fewflower clover | Trifolium oliganthum Steud. | TROL |
| fewflower holdback | Caesalpinia pauciflora (Griseb.) C. Wright ex Sauvalle | CAPA34 |
| fewflower pea | Lathyrus pauciflorus Fern. | LAPA5 |
| fewflower pea | Lathyrus pauciflorus Fern. var. pauciflorus | LAPAP2 |
| fewflower ticktrefoil | Desmodium pauciflorum (Nutt.) DC. | DEPA7 |
| field clover | Trifolium campestre Schreb. | TRCA5 |
| field locoweed | Oxytropis campestris (L.) DC. | OXCA4 |
| field locoweed | Oxytropis campestris (L.) DC. var. chartacea (Fassett) Barneby | OXCAC |
| field locoweed | Oxytropis campestris (L.) DC. var. columbiana (St. John) Barneby | OXCAC2 |
| field locoweed | Oxytropis campestris (L.) DC. var. dispar (A. Nels.) Barneby | OXCAD |
| field locoweed | Oxytropis campestris (L.) DC. var. spicata Hook. | OXCAS3 |
| field locoweed | Oxytropis campestris (L.) DC. var. varians (Rydb.) Barneby | OXCAV |
| field locoweed | Oxytropis campestris (L.) DC. var. wanapum E. Joyal | OXCAW |
| field restharrow | Ononis arvensis L. | ONAR |
| Fish Slough milkvetch | Astragalus lentiginosus Dougl. ex Hook. var. piscinensis Barneby | ASLEP3 |
| Fisher milkvetch | Astragalus piscator Barneby & Welsh | ASPI6 |
| fishpoison | Tephrosia purpurea (L.) Pers. | TEPU |
| fiveleaf clover | Trifolium andersonii Gray | TRAN |
| fiveleaf clover | Trifolium andersonii Gray ssp. andersonii | TRANA2 |
| flat pea | Lathyrus sylvestris L. | LASY |
| flemingia | Flemingia Roxb. ex Ait. f. | FLEMI |
| Flemingia strobilifera | Moghania strobilifera (L.) St.-Hil. ex Kuntze | MOST4 |
| fleshy lupine | Lupinus affinis J.G. Agardh | LUAF |
| flexile milkvetch | Astragalus flexuosus (Hook.) Dougl. ex G. Don | ASFL2 |
| flexile milkvetch | Astragalus flexuosus (Hook.) Dougl. ex G. Don var. flexuosus | ASFLF |
| Flint Mountain milkvetch | Astragalus siliceus Barneby | ASSI3 |
| flor de conchitas | Centrosema pubescens Benth. | CEPU5 |
| flor de San Jose | Senna atomaria (L.) Irwin & Barneby | SEAT3 |
| Florida alicia | Chapmannia floridana Torr. & Gray | CHFL2 |
| Florida fishpoison tree | Piscidia piscipula (L.) Sarg. | PIPI3 |
| Florida hammock milkpea | Galactia striata (Jacq.) Urban | GAST2 |
| Florida hoarypea | Tephrosia florida (F.G. Dietr.) C.E. Wood | TEFL |
| Florida Keys blackbead | Pithecellobium keyense Britt. ex Britt. & Rose | PIKE |
| Florida Keys sensitive pea | Chamaecrista deeringiana Small & Pennell | CHDE9 |
| Florida milkpea | Galactia floridana Torr. & Gray | GAFL3 |
| Florida milkvetch | Astragalus obcordatus Ell. | ASOB3 |
| Florida mimosa | Mimosa quadrivalvis L. var. floridana (Chapman) Barneby | MIQUF |
| Florida prairie clover | Dalea carthagenensis (Jacq.) J.F. Macbr. var. floridana (Rydb.) Barneby | DACAF |
| Florida ticktrefoil | Desmodium floridanum Chapman | DEFL3 |
| Florida vetch | Vicia floridana S. Wats. | VIFL2 |
| Florida wild indigo | Baptisia calycosa Canby | BACA4 |
| Florida wild indigo | Baptisia calycosa Canby var. calycosa | BACAC2 |
| Florida wild indigo | Baptisia calycosa Canby var. villosa Canby | BACAV |
| foothill clover | Trifolium ciliolatum Benth. | TRCI |
| foothill deervetch | Lotus humistratus Greene | LOHU2 |
| foothill milkvetch | Astragalus tridactylicus Gray | ASTR7 |
| forest clover | Trifolium breweri S. Wats. | TRBR3 |
| forest scurfpea | Rupertia physodes (Dougl. ex Hook.) J. Grimes | RUPH3 |
| Fort Bowie prairie clover | Dalea brachystachya Gray | DABR |
| Fort Wingate milkvetch | Astragalus wingatanus S. Wats. | ASWI2 |
| fourleaf vetch | Vicia acutifolia Ell. | VIAC3 |
| fourvalve mimosa | Mimosa quadrivalvis L. | MIQU2 |
| fourvalve mimosa | Mimosa quadrivalvis L. var. ?leptocarpa (DC.) Barneby | MIQUL2 |
| fourvalve mimosa | Mimosa quadrivalvis L. var. quadrivalvis | MIQUQ |
| fourwing milkvetch | Astragalus tetrapterus Gray | ASTE10 |
| foxtail prairie clover | Dalea leporina (Ait.) Bullock | DALE3 |
| foxtail restharrow | Ononis alopecuroides L. | ONAL5 |
| fragrant mimosa | Mimosa borealis Gray | MIBO2 |
| freckled milkvetch | Astragalus lentiginosus Dougl. ex Hook. | ASLE8 |
| freckled milkvetch | Astragalus lentiginosus Dougl. ex Hook. var. ambiguus Barneby | ASLEA2 |
| freckled milkvetch | Astragalus lentiginosus Dougl. ex Hook. var. antonius Barneby | ASLEA3 |
| freckled milkvetch | Astragalus lentiginosus Dougl. ex Hook. var. australis Barneby | ASLEA5 |
| freckled milkvetch | Astragalus lentiginosus Dougl. ex Hook. var. diphysus (Gray) M.E. Jones | ASLED |
| freckled milkvetch | Astragalus lentiginosus Dougl. ex Hook. var. floribundus Gray | ASLEF |
| freckled milkvetch | Astragalus lentiginosus Dougl. ex Hook. var. idriensis M.E. Jones | ASLEI |
| freckled milkvetch | Astragalus lentiginosus Dougl. ex Hook. var. ineptus (Gray) M.E. Jones | ASLEI2 |
| freckled milkvetch | Astragalus lentiginosus Dougl. ex Hook. var. latus (M.E. Jones) M.E. Jones | ASLEL |
| freckled milkvetch | Astragalus lentiginosus Dougl. ex Hook. var. lentiginosus | ASLEL3 |
| freckled milkvetch | Astragalus lentiginosus Dougl. ex Hook. var. micans Barneby | ASLEM3 |
| freckled milkvetch | Astragalus lentiginosus Dougl. ex Hook. var. nigricalycis M.E. Jones | ASLEN |
| freckled milkvetch | Astragalus lentiginosus Dougl. ex Hook. var. oropedii Barneby | ASLEO |
| freckled milkvetch | Astragalus lentiginosus Dougl. ex Hook. var. palans (M.E. Jones) M.E. Jones | ASLEP |
| freckled milkvetch | Astragalus lentiginosus Dougl. ex Hook. var. semotus Jepson | ASLES3 |
| freckled milkvetch | Astragalus lentiginosus Dougl. ex Hook. var. stramineus (Rydb.) Barneby | ASLES6 |
| freckled milkvetch | Astragalus lentiginosus Dougl. ex Hook. var. variabilis Barneby | ASLEV |
| freckled milkvetch | Astragalus lentiginosus Dougl. ex Hook. var. vitreus Barneby | ASLEV2 |
| Fremont's birsfoot trefoil | Lotus argophyllus (Gray) Greene var. fremontii (Gray) Ottley | LOARF |
| Fremont's dalea | Psorothamnus fremontii (Torr. ex Gray) Barneby | PSFR |
| Fremont's dalea | Psorothamnus fremontii (Torr. ex Gray) Barneby var. attenuatus Barneby | PSFRA |
| Fremont's dalea | Psorothamnus fremontii (Torr. ex Gray) Barneby var. fremontii | PSFRF |
| Fremont's milkvetch | Astragalus lentiginosus Dougl. ex Hook. var. fremontii (Gray ex Torr.) S. Wats. | ASLEF2 |
| French broom | Genista monspessulana (L.) L. Johnson | GEMO2 |
| French-grass | Orbexilum onobrychis (Nutt.) Rydb. | ORON |
| fringed wattle | Acacia fimbriata A. Cunn. ex G. Don | ACFI4 |
| fringeleaf necklacepod | Sophora stenophylla Gray | SOST4 |
| Frisco clover | Trifolium friscanum (Welsh) Welsh | TRFR4 |
| Front Range milkvetch | Astragalus sparsiflorus Gray | ASSP5 |
| Front Range milkvetch | Astragalus sparsiflorus Gray var. majusculus Gray | ASSPM |
| Front Range milkvetch | Astragalus sparsiflorus Gray var. sparsiflorus | ASSPS3 |
| frosty wattle | Acacia pruinosa A. Cunn. ex Benth. | ACPR4 |
| Funeral Mountain milkvetch | Astragalus funereus M.E. Jones | ASFU3 |
| fustic | Pictetia aculeata (Vahl) Urban | PIAC |
| fuzzybean | Strophostyles Ell. | STROP |
| fuzzyleaf clover | Trifolium eriocephalum Nutt. ssp. villiferum (House) J. Gillett | TRERV2 |
| Galactia elliottii | Galactia elliottii Nutt. var. leavenworthii Torr. & Gray | GAELL2 |
| Galactia erecta | Galactia brachypoda Torr. & Gray | GABR3 |
| Galactia floridana | Galactia brevipes Small | GABR4 |
| Galactia floridana | Galactia fasciculata Vail | GAFA2 |
| Galactia floridana | Galactia floridana Torr. & Gray var. longiracemosa Vail | GAFLL |
| Galactia heterophylla | Galactia grayi Vail | GAGR8 |
| Galactia microphylla | Galactia floridana Torr. & Gray var. microphylla Chapman | GAFLM |
| Galactia microphylla | Galactia minor Duncan | GAMI5 |
| Galactia mollis | Galactia mollis Michx. var. nashii Vail | GAMON |
| Galactia regularis | Galactia glabella Michx. | GAGL4 |
| Galactia smallii | Galactia prostrata Small | GAPR3 |
| Galactia striata | Galactia cubensis Kunth | GACU2 |
| Galactia striata | Galactia spiciformis Torr. & Gray | GASP6 |
| Galactia volubilis | Galactia macreei M.A. Curtis | GAMA |
| Galactia volubilis | Galactia mississippiensis (Vail) Rydb. | GAMI6 |
| Galactia volubilis | Galactia volubilis (L.) Britt. var. mississippiensis Vail | GAVOM |
| Galega lindblomii | Astragalus somalensis Taub. ex Harms var. lindblomii Harms | ASSOL2 |
| gamba-pea | Crotalaria goreensis Guill. & Perr. | CRGO3 |
| Gambel's dwarf milkvetch | Astragalus gambelianus Sheldon | ASGA |
| garden pea | Pisum sativum L. | PISA6 |
| garden puff | Neptunia prostrata (Lam.) Baill. | NEPR2 |
| garden vetch | Vicia sativa L. | VISA |
| garden vetch | Vicia sativa L. ssp. nigra (L.) Ehrh. | VISAN2 |
| garden vetch | Vicia sativa L. ssp. sativa | VISAS2 |
| Garfield lupine | Lupinus garfieldensis C.P. Sm. | LUGA |
| Gaudichaud's senna | Senna gaudichaudii (Hook. & Arn.) Irwin & Barneby | SEGA2 |
| Genista canariensis | Cytisus ?racemosus Nichols. | CYRA2 |
| Genista canariensis | Cytisus canariensis (L.) Kuntze | CYCA6 |
| Genista canariensis | Teline canariensis (L.) Webb & Berth. | TECA11 |
| Genista linifolia | Cytisus linifolius (L.) Lam. | CYLI2 |
| Genista linifolia | Teline linifolia (L.) Webb & Berth. | TELI4 |
| Genista monspessulana | Cytisus monspessulanus L. | CYMO5 |
| Genista monspessulana | Teline monspessulana (L.) K. Koch | TEMO |
| Genista stenopetala | Cytisus maderensis (Webb & Berth.) Masf. | CYMA19 |
| Genista stenopetala | Cytisus stenopetalus (Webb & Berth.) Christ | CYST3 |
| Genista tinctoria | Genista patula M. Bieb. | GEPA10 |
| Genista tinctoria var. tinctoria | Genista multibracteata Tausch | GEMU2 |
| Genista tridentata | Chamaespartium tridentatum (L.) P. E. Gibbs | CHTR13 |
| geno | Lonchocarpus glaucifolius Urban | LOGL2 |
| geno geno | Lonchocarpus domingensis (Turp. ex Pers.) DC. | LODO5 |
| Gentry's indigobush | Dalea tentaculoides H.C. Gentry | DATE4 |
| geocarpa groundnut | Macrotyloma geocarpum (Harms) Marechal & Baudet | MAGE2 |
| Geoffroea decorticans | Gourliea decorticans Gillies ex Hook. & Arn. | GODE8 |
| Georgia false indigo | Amorpha georgiana Wilbur | AMGE |
| Georgia false indigo | Amorpha georgiana Wilbur var. confusa Wilbur | AMGEC |
| Georgia false indigo | Amorpha georgiana Wilbur var. georgiana | AMGEG |
| Geyer's milkvetch | Astragalus geyeri Gray | ASGE |
| Geyer's milkvetch | Astragalus geyeri Gray var. geyeri | ASGEG |
| Geyer's milkvetch | Astragalus geyeri Gray var. triquetrus (Gray) M.E. Jones | ASGET |
| giant false sensitive plant | Mimosa diplotricha C. Wright | MIDI8 |
| giant milkvetch | Astragalus giganteus S. Wats. | ASGI2 |
| giant vetch | Vicia nigricans Hook. & Arn. ssp. gigantea (Hook.) Lassetter & Gunn. | VINIG |
| Gibbs's milkvetch | Astragalus gibbsii Kellogg | ASGI |
| gidgee | Acacia cambagei R. T. Baker | ACCA25 |
| Gila milkvetch | Astragalus gilensis Greene | ASGI3 |
| Gilman's milkvetch | Astragalus gilmanii Tidestrom | ASGI4 |
| gladiator milkvetch | Astragalus xiphoides (Barneby) Barneby | ASXI |
| glandleaf prairie clover | Dalea lachnostachys Gray | DALA |
| glandular bundleflower | Desmanthus glandulosus (B.L. Turner) Luckow | DEGL8 |
| glandular clover | Trifolium glanduliferum Boiss. | TRGL9 |
| glandular senna | Senna multiglandulosa (Jacq.) Irwin & Barneby | SEMU14 |
| Gleditsia aquatica | Gleditsia monosperma Walter | GLMO |
| Gleditsia japonica var. japonica | Gleditsia japonica Miq. var. koraiensis Nakai | GLJAK |
| Gleditsia triacanthos | Gleditsia triacanthos L. var. inermis (L.) Schneid. | GLTRI |
| Glenwood milkvetch | Astragalus loanus Barneby | ASLO2 |
| glory pea | Clianthus Sol. ex Lindl. | CLIAN |
| glory wattle | Acacia spectabilis A. Cunn. ex Benth. | ACSP9 |
| glory-pea | Clianthus puniceus (G. Don) Sol. Ex Lindl. | CLPU6 |
| glossy shower | Senna surattensis (Burm. f.) Irwin & Barneby | SESU4 |
| glycine | Glycine tabacina (Labill.) Benth. | GLTA2 |
| glycine | Glycine tomentella Hayata | GLTO2 |
| Glycine max | Dolichos soja L. | DOSO |
| Glycine max | Glycine gracilis Skvortzov | GLGR2 |
| Glycine max | Glycine hispida (Moench) Maxim. | GLHI |
| Glycine max | Glycine soja Sieb. & Zucc. | GLSO80 |
| Glycine max | Glycine ussuriensis Regel & Maack | GLUS |
| Glycine max | Phaseolus max L. | PHMA21 |
| Glycine max | Soja hispida Moench | SOHI5 |
| Glycine max | Soja max (L.) Piper | SOMA8 |
| Glycine tabacina | Glycine koidzumii Ohwi | GLKO2 |
| Glycyrrhiza lepidota | Glycyrrhiza glutinosa Nutt. | GLGL4 |
| Glycyrrhiza lepidota | Glycyrrhiza lepidota Pursh var. glutinosa (Nutt.) S. Wats. | GLLEG |
| goat pea | Securigera securidaca (L.) O. Deg. & Dorf. | SESE80 |
| gold-dust acacia | Acacia acinacea Lindl. | ACAC7 |
| golden chain tree | Laburnum anagyroides Medik. | LAAN2 |
| golden chain tree | Laburnum Medik. | LABUR |
| golden clover | Trifolium aureum Pollich | TRAU2 |
| golden prairie clover | Dalea aurea Nutt. ex Pursh | DAAU |
| golden shower | Cassia fistula L. | CAFI3 |
| golden wattle | Acacia pycnantha Benth. | ACPY3 |
| goldenbanner | Thermopsis R. Br. ex Ait. f. | THERM |
| goldenrain wattle | Acacia prominens A. Cunn. ex G. Don | ACPR3 |
| Goose Creek milkvetch | Astragalus anserinus Atwood, Goodrich & Welsh | ASAN7 |
| gopherweed | Baptisia lanceolata (Walt.) Ell. | BALA3 |
| gopherweed | Baptisia lanceolata (Walt.) Ell. var. lanceolata | BALAL |
| Gorman's lupine | Lupinus gormanii Piper | LUGO |
| gorse | Ulex L. | ULEX |
| graceful mimosa | Mimosa casta L. | MICA9 |
| graceful wattle | Acacia decora Rchb. | ACDE12 |
| graceful wattle | Acacia gracilifolia Maiden & Blakely | ACGR9 |
| Graham's mimosa | Mimosa grahamii Gray | MIGR2 |
| Graham's ticktrefoil | Desmodium grahamii Gray | DEGR2 |
| Grand Junction milkvetch | Astragalus linifolius Osterhout | ASLI5 |
| Grant's rattlebox | Crotalaria virgulata Klotzsch ssp. grantiana (Harvey) Polhill | CRVIG |
| Grants Pass lupine | Lupinus fissicalyx Heller | LUFI |
| grape soda lupine | Lupinus excubitus M.E. Jones | LUEX |
| grape soda lupine | Lupinus excubitus M.E. Jones var. excubitus | LUEXE |
| grass milkvetch | Astragalus chloodes Barneby | ASCH7 |
| grass pea | Lathyrus nissolia L. | LANI3 |
| grass pea | Lathyrus sphaericus Retz. | LASP2 |
| grassleaf pea | Lathyrus graminifolius (S. Wats.) White | LAGR3 |
| grassleaf ticktrefoil | Desmodium gramineum Gray | DEGR5 |
| grassnut | Arachis prostrata Benth. | ARPR4 |
| gravel milkvetch | Astragalus sabulonum Gray | ASSA2 |
| gray mulga | Acacia brachybotrya Benth. | ACBR3 |
| gray nicker | Ticanto Adans. | TICAN2 |
| gray nicker | Ticanto nuga (L.) Medik. | TINU |
| Gray's bean | Phaseolus pedicellatus Benth. var. grayanus (Woot. & Standl.) A. Delgado ex Isely | PHPEG |
| Gray's milkpea | Galactia heterophylla Gray | GAHE |
| Gray's milkvetch | Astragalus grayi Parry ex S. Wats. | ASGR4 |
| Gray's prairie clover | Dalea grayi (Vail) L.O. Williams | DAGR |
| grayhairy wild indigo | Baptisia cinerea (Raf.) Fern. & Schub. | BACI |
| graying clover | Trifolium canescens Willd. | TRCA27 |
| Great Basin lupine | Lupinus ?alpestris A. Nels. (pro sp.) [argenteus ? caudatus] | LUAL5 |
| great bladdery milkvetch | Astragalus megacarpus (Nutt.) Gray | ASME2 |
| great leadtree | Leucaena pulverulenta (Schlecht.) Benth. | LEPU3 |
| Green River milkvetch | Astragalus pubentissimus Torr. & Gray | ASPU6 |
| green slender lupine | Lupinus gracilentus Greene | LUGR |
| green wattle | Acacia decurrens (Wendl. f.) Willd. | ACDE |
| green wattle | Acacia irrorata Sieber ex Spreng. | ACIR |
| Greene's bird's-foot trefoil | Lotus greenei Ottley ex Kearney & Peebles | LOGR4 |
| Greene's milkvetch | Astragalus flexuosus (Hook.) Dougl. ex G. Don var. greenei (Gray) Barneby | ASFLG |
| greenleaf ticktrefoil | Desmodium intortum (P. Mill.) Urban | DEIN2 |
| greenstipule lupine | Lupinus fulcratus Greene | LUFU |
| greentwig | Brongniartia Kunth | BRONG |
| Gregg's prairie clover | Dalea greggii Gray | DAGR2 |
| Gregg's sensitive pea | Chamaecrista greggii (Gray) Pollard ex Heller | CHGR18 |
| Grimes's pea | Lathyrus grimesii Barneby | LAGR9 |
| ground-crescent milkvetch | Astragalus chamaemeniscus Barneby | ASCH5 |
| groundcover milkvetch | Astragalus humistratus Gray | ASHU2 |
| groundcover milkvetch | Astragalus humistratus Gray var. crispulus Barneby | ASHUC |
| groundcover milkvetch | Astragalus humistratus Gray var. hosackiae (Greene) M.E. Jones | ASHUH |
| groundcover milkvetch | Astragalus humistratus Gray var. humistratus | ASHUH3 |
| groundcover milkvetch | Astragalus humistratus Gray var. humivagans (Rydb.) Barneby | ASHUH2 |
| groundcover milkvetch | Astragalus humistratus Gray var. sonorae (Gray) M.E. Jones | ASHUS |
| groundcover milkvetch | Astragalus humistratus Gray var. tenerrimus M.E. Jones | ASHUT |
| groundnut | Apios americana Medik. | APAM |
| groundnut | Apios Fabr. | APIOS |
| groundnut | Arachis villosulicarpa Hoehne | ARVI16 |
| groundplum milkvetch | Astragalus crassicarpus Nutt. | ASCR2 |
| groundplum milkvetch | Astragalus crassicarpus Nutt. var. berlandieri Barneby | ASCRB |
| groundplum milkvetch | Astragalus crassicarpus Nutt. var. cavus Barneby | ASCRC |
| groundplum milkvetch | Astragalus crassicarpus Nutt. var. crassicarpus | ASCRC3 |
| groundplum milkvetch | Astragalus crassicarpus Nutt. var. paysonii (E.H. Kelso) Barneby | ASCRP |
| groundplum milkvetch | Astragalus crassicarpus Nutt. var. trichocalyx (Nutt.) Barneby | ASCRT |
| Guadalupe Island lupine | Lupinus guadalupensis Greene | LUGU |
| Guadalupe milkvetch | Astragalus pictiformis Barneby | ASPI3 |
| Guadalupe Mountain necklacepod | Sophora gypsophila B.L. Turner & A. Powell | SOGY80 |
| Guadalupe Mountain necklacepod | Sophora gypsophila B.L. Turner & A. Powell var. guadalupensis B.L. Turner & A. Powell | SOGYG |
| Guadeloupe blackbead | Cojoba graciliflora (S.F. Blake) Britt. & Rose | COGR22 |
| guaje | Leucaena esculenta (Sess? & Moci?o) Benth. | LEES2 |
| guajillo | Acacia berlandieri Benth. | ACBE |
| guama venezolano | Inga nobilis Willd. | INNO |
| guama venezolano | Inga nobilis Willd. ssp. quaternata (Poepp. & Endl.) T.D. Pennington | INNOQ |
| guar | Cyamopsis tetragonoloba (L.) Taubert | CYTE11 |
| Guatemalan indigo | Indigofera guatemalensis Moc. & Sess? ex Prain & Baker | INGU |
| Gulf Coast lupine | Lupinus westianus Small | LUWE |
| Gulf Coast lupine | Lupinus westianus Small var. aridorum (McFarlin ex Beckner) Isely | LUWEA |
| Gulf Coast lupine | Lupinus westianus Small var. westianus | LUWEW |
| Gulf Indian breadroot | Pediomelum rhombifolium (Torr. & Gray) Rydb. | PERH2 |
| gum arabic | Acacia senegal (L.) Willd. | ACSE6 |
| gum arabic tree | Acacia nilotica (L.) Willd. ex Delile | ACNI2 |
| gum copal tree | Daniellia ogea (Harms) Rolfe ex Holland | DAOG |
| gum tragacanth milkvetch | Astragalus gummifer Labill. | ASGU |
| gumbo milkvetch | Astragalus ampullarius S. Wats. | ASAM6 |
| Gunnison milkvetch | Astragalus anisus M.E. Jones | ASAN4 |
| gypsum milkvetch | Astragalus gypsodes Barneby | ASGY |
| habilla | Rhynchosia reticulata (Sw.) DC. | RHRE3 |
| haematoxylum | Haematoxylum L. | HAEMA2 |
| hairy bigleaf lupine | Lupinus prunophilus M.E. Jones | LUPR2 |
| hairy bird's-foot trefoil | Lotus subbiflorus Lag. | LOSU80 |
| hairy canary-clover | Dorycnium hirsutum (L.) Ser. | DOHI2 |
| hairy jointvetch | Aeschynomene villosa Poir. | AEVI2 |
| hairy lespedeza | Lespedeza hirta (L.) Hornem. | LEHI2 |
| hairy lespedeza | Lespedeza hirta (L.) Hornem. ssp. hirta | LEHIH2 |
| hairy medick | Medicago monspeliaca (L.) Trautv. | MEMO5 |
| hairy prairie clover | Dalea mollis Benth. | DAMO |
| hairy sensitive pea | Chamaecrista pilosa (L.) Greene | CHPI5 |
| hairy small-leaf ticktrefoil | Desmodium ciliare (Muhl. ex Willd.) DC. | DECI |
| hairy small-leaf ticktrefoil | Desmodium ciliare (Muhl. ex Willd.) DC. var. ciliare | DECIC |
| hairy yellow vetch | Vicia hybrida L. | VIHY80 |
| hairy-pod milkvetch | Astragalus concordius Welsh | ASCO61 |
| hairybroom | Cytisus villosus Pourret | CYVI8 |
| hairypod cowpea | Vigna luteola (Jacq.) Benth. | VILU3 |
| halfmoon milkvetch | Astragalus allochrous Gray | ASAL6 |
| halfmoon milkvetch | Astragalus allochrous Gray var. allochrous | ASALA10 |
| halfmoon milkvetch | Astragalus allochrous Gray var. playanus Isely | ASALP |
| halimodendron | Halimodendron Fischer ex DC. | HALIM2 |
| Halimodendron halodendron | Robinia halodendron Pallas | ROHA5 |
| Hall's bush lupine | Lupinus excubitus M.E. Jones var. hallii (Abrams) C.P. Sm. | LUEXH |
| Hall's California tea | Rupertia hallii (Rydb.) J. Grimes | RUHA5 |
| Hall's milkvetch | Astragalus hallii Gray | ASHA2 |
| Hall's milkvetch | Astragalus hallii Gray var. fallax (M.E. Jones) Barneby | ASHAF |
| Hall's milkvetch | Astragalus hallii Gray var. hallii | ASHAH |
| Hall's prairie clover | Dalea hallii Gray | DAHA |
| Hamilton's milkvetch | Astragalus hamiltonii C.L. Porter | ASHA3 |
| hangingpod milkvetch | Astragalus atropubescens Coult. & Fisher | ASAT2 |
| Hansen's clover | Trifolium longipes Nutt. ssp. hansenii (Greene) J. Gillett | TRLOH |
| haresfoot locoweed | Oxytropis lagopus Nutt. | OXLA2 |
| haresfoot locoweed | Oxytropis lagopus Nutt. var. atropurpurea (Rydb.) Barneby | OXLAA |
| haresfoot locoweed | Oxytropis lagopus Nutt. var. conjugans Barneby | OXLAC |
| haresfoot locoweed | Oxytropis lagopus Nutt. var. lagopus | OXLAL |
| harlequin annual lupine | Lupinus stiversii Kellogg | LUST2 |
| Harold's milkvetch | Astragalus robbinsii (Oakes) Gray var. harringtonii (Rydb.) Barneby | ASROH |
| Harrison's milkvetch | Astragalus harrisonii Barneby | ASHA4 |
| Hartweg's locust | Robinia viscosa Vent. var. hartwegii (Koehne) Ashe | ROVIH2 |
| Hartweg's milkvetch | Astragalus hartwegii Benth. | ASHA5 |
| Harwood's milkvetch | Astragalus insularis Kellogg var. harwoodii Munz & McBurney | ASINH |
| Hasse's vetch | Vicia hassei S. Wats. | VIHA3 |
| haujillo | Havardia pallens (Benth.) Britt. & Rose | HAPA10 |
| Haussknecht's clover | Trifolium haussknechtii Boiss. | TRHA3 |
| havardia | Havardia Small | HAVAR |
| Havardia mexicana | Pithecellobium mexicanum Rose | PIME3 |
| Havardia pallens | Pithecellobium pallens (Benth.) Standl. | PIPA4 |
| Havardia sonorae | Pithecellobium sonorae S. Watson | PISO3 |
| Hawai'i jadevine | Strongylodon ruber Vogel | STRU4 |
| Hawai'i pearls | Caesalpinia major (Medik.) Dandy & Exell | CAMA21 |
| Hawai'i ticktrefoil | Desmodium sandwicense E. Mey. | DESA81 |
| Hawai'i vetch | Vicia menziesii Spreng. | VIME |
| Hayden's clover | Trifolium haydenii Porter | TRHA |
| Hayden's milkvetch | Astragalus bisulcatus (Hook.) Gray var. haydenianus (Gray) Barneby | ASBIH |
| Hayun lagu | Serianthes nelsonii Merr. | SENE9 |
| Hebestigma cubense var. cubense | Robinia cubense Kunth | ROCU4 |
| hediondilla | Senna nitida (L.C. Rich.) Irwin & Barneby | SENI3 |
| Hedysarum alpinum | Hedysarum alpinum L. ssp. americanum (Michx.) Fedtsch. | HEALA2 |
| Hedysarum alpinum | Hedysarum alpinum L. var. americanum Michx. | HEALA |
| Hedysarum alpinum | Hedysarum alpinum L. var. grandiflorum Rollins | HEALG |
| Hedysarum alpinum | Hedysarum alpinum L. var. philoscia (A. Nels.) Rollins | HEALP |
| Hedysarum alpinum | Hedysarum americanum (Michx.) Britt. | HEAM9 |
| Hedysarum alpinum | Hedysarum caucasicum M. Bieb. | HECA33 |
| Hedysarum alpinum | Hedysarum hedysaroides auct. non (L.) Schinz & Thellung [misapplied] | HEHE2 |
| Hedysarum alpinum | Hedysarum philoscia A. Nels. | HEPH2 |
| Hedysarum alpinum | Hedysarum truncatum Eastw. | HETR2 |
| Hedysarum alpinum var. alpinum | Hedysarum sibiricum Poir. | HESI5 |
| Hedysarum biebersteinii | Hedysarum argenteum M. Bieb., nom. illeg. [anomalous] | HEAR18 |
| Hedysarum boreale ssp. boreale var. boreale | Hedysarum boreale Nutt. var. cinerascens (Rydb.) Rollins | HEBOC |
| Hedysarum boreale ssp. boreale var. boreale | Hedysarum boreale Nutt. var. obovatum Rollins | HEBOO2 |
| Hedysarum boreale ssp. boreale var. boreale | Hedysarum boreale Nutt. var. pabulare (A. Nels.) Dorn | HEBOP |
| Hedysarum boreale ssp. boreale var. boreale | Hedysarum boreale Nutt. var. rivulare (L.O. Williams) Northstrom | HEBOR |
| Hedysarum boreale ssp. boreale var. boreale | Hedysarum boreale Nutt. var. typicum Rollins | HEBOT |
| Hedysarum boreale ssp. boreale var. boreale | Hedysarum boreale Nutt. var. utahense (Rydb.) Rollins | HEBOU2 |
| Hedysarum boreale ssp. boreale var. boreale | Hedysarum cinerascens Rydb. | HECI7 |
| Hedysarum boreale ssp. boreale var. boreale | Hedysarum mackenziei Richards. var. fraseri Boivin | HEMAF |
| Hedysarum boreale ssp. boreale var. boreale | Hedysarum pabulare A. Nels. | HEPA27 |
| Hedysarum boreale ssp. boreale var. boreale | Hedysarum pabulare A. Nels. var. rivulare L.O. Williams | HEPAR3 |
| Hedysarum boreale ssp. boreale var. boreale | Hedysarum utahense Rydb. | HEUT2 |
| Hedysarum boreale ssp. boreale var. gremiale | Hedysarum gremiale Rollins | HEGR15 |
| Hedysarum boreale ssp. mackenziei | Hedysarum boreale Nutt. var. mackenziei (Richards.) C.L. Hitchc. | HEBOM3 |
| Hedysarum boreale ssp. mackenziei | Hedysarum mackenziei Richards. | HEMA |
| Hedysarum fruticosum | Hedysarum fruticosum Pall. ssp. mongolicum (Turcz.) B. Fedtsch. | HEFRM2 |
| Hedysarum occidentale var. occidentale | Hedysarum uintahense A. Nels. | HEUI |
| Hedysarum spinosissimum | Hedysarum pallens (Moris) Hal. | HEPA25 |
| Heermann's bird's-foot trefoil | Lotus heermannii (Dur. & Hilg.) Greene | LOHE |
| Heermann's bird's-foot trefoil | Lotus heermannii (Dur. & Hilg.) Greene var. heermannii | LOHEH |
| Heermann's bird's-foot trefoil | Lotus heermannii (Dur. & Hilg.) Greene var. orbicularis (Gray) Isely | LOHEO |
| Heldreich's alfalfa | Medicago heldreichii E. Small | MEHE5 |
| Heldreich's clover | Trifolium heldreichianum (Gibelli & Belli) Hausskn. | TRHE6 |
| Heller's bird's-foot trefoil | Lotus unifoliolatus (Hook.) Benth. var. helleri (Britt.) Kartesz & Gandhi | LOUNH |
| Heller's dwarf lupine | Lupinus lapidicola Heller | LULA |
| Henderson's milkvetch | Astragalus accidens S. Wats. var. hendersonii M.E. Jones | ASACH |
| hermit milkvetch | Astragalus eremiticus Sheldon | ASER4 |
| Higgins's milkvetch | Astragalus lentiginosus Dougl. ex Hook. var. higginsii Welsh & Thorne | ASLEH |
| Hill's lupine | Lupinus hillii Greene | LUHI2 |
| Hill's lupine | Lupinus hillii Greene var. arizonicus (C.P. Sm.) Harmon | LUHIA |
| Hill's lupine | Lupinus hillii Greene var. hillii | LUHIH |
| hillside milkvetch | Astragalus collinus (Hook.) Dougl. ex G. Don | ASCO7 |
| hillside milkvetch | Astragalus collinus (Hook.) Dougl. ex G. Don var. collinus | ASCOC7 |
| hippocrepis | Hippocrepis commutata Pau | HICO6 |
| hippocrepis | Hippocrepis L. | HIPPO5 |
| Hippocrepis emerus ssp. emeroides | Coronilla emeroides Boiss. & Spruner | COEM4 |
| Hippocrepis scabra | Hippocrepis bourgaei Nyman | HIBO4 |
| hoary milkpea | Galactia canescens Benth. | GACA |
| hoary pea | Lathyrus polymorphus Nutt. ssp. incanus (Sm. & Rydb.) C.L. Hitchc. | LAPOI |
| hoary ticktrefoil | Desmodium canescens (L.) DC. | DECA8 |
| hoarypea | Tephrosia Pers. | TEPHR |
| hoarypea | Tephrosia sinapou (Buc'hoz) A. Chev. | TESI2 |
| Hoffmannseggia drepanocarpa | Caesalpinia drepanocarpa (Gray) Fisher | CADR6 |
| Hoffmannseggia drummondii | Caesalpinia drummondii (Torr. & Gray) Fisher | CADR3 |
| Hoffmannseggia drummondii | Caesalpinia texensis (Fisher) Fisher | CATE18 |
| Hoffmannseggia glauca | Hoffmannseggia densiflora Benth. | HODE |
| Hoffmannseggia glauca | Hoffmannseggia densiflora Benth. var. capitata Fisher | HODEC |
| Hoffmannseggia glauca | Hoffmannseggia densiflora Benth. var. demissa (Gray) Fisher | HODED |
| Hoffmannseggia glauca | Hoffmannseggia densiflora Benth. var. pringlei Fisher | HODEP |
| Hoffmannseggia glauca | Hoffmannseggia densiflora Benth. var. stricta (Benth.) Fisher | HODES |
| Hoffmannseggia glauca | Hoffmannseggia falcaria Cav. | HOFA3 |
| Hoffmannseggia microphylla | Caesalpinia virgata Fisher | CAVI8 |
| Hoffmannseggia oxycarpa | Caesalpinia oxycarpa (Benth. ex Gray) Fisher | CAOX3 |
| Hoffmannseggia repens | Caesalpinia repens Eastw. | CARE16 |
| hogpeanut | Amphicarpaea Ell. ex Nutt. | AMPHI4 |
| Hoita macrostachya | Hoita longiloba Rydb. | HOLO2 |
| Hoita macrostachya | Hoita rhombifolia (Torr.) Rydb. | HORH |
| Hoita macrostachya | Hoita villosa Greene | HOVI3 |
| Hoita macrostachya | Psoralea douglasii Greene | PSDO |
| Hoita macrostachya | Psoralea douglasii Greene var. hansenii Jepson | PSDOH |
| Hoita macrostachya | Psoralea hallii (Rydb.) Jepson var. media Jepson | PSHAM2 |
| Hoita macrostachya | Psoralea macrostachya DC. | PSMA2 |
| Hoita macrostachya | Psoralea macrostachya DC. var. longiloba (Rydb.) J.F. Macbr. | PSMAL |
| Hoita macrostachya | Psoralea macrostachya DC. var. rhombifolia Torr. | PSMAR |
| Hoita orbicularis | Psoralea orbicularis Lindl. | PSOR2 |
| Hoita strobilina | Psoralea strobilina Hook. & Arn. | PSST |
| hollowleaf annual lupine | Lupinus succulentus Dougl. ex K. Koch | LUSU3 |
| hollyleaf clover | Trifolium gymnocarpon Nutt. | TRGY |
| hollyleaf clover | Trifolium gymnocarpon Nutt. ssp. gymnocarpon | TRGYG |
| Holmgren's lupine | Lupinus holmgrenianus C.P. Sm. | LUHO |
| holo lupine | Lupinus holosericeus Nutt. | LUHO2 |
| honey mesquite | Prosopis glandulosa Torr. | PRGL2 |
| honey mesquite | Prosopis glandulosa Torr. var. glandulosa | PRGLG |
| honey mesquite | Prosopis glandulosa Torr. var. prostrata Burkart | PRGLP |
| honeylocust | Gleditsia triacanthos L. | GLTR |
| Hood River milkvetch | Astragalus hoodianus T.J. Howell | ASHO |
| Hopi milkvetch | Astragalus fucatus Barneby | ASFU2 |
| horn loco milkvetch | Astragalus missouriensis Nutt. var. mimetes Barneby | ASMIM |
| Horn's milkvetch | Astragalus hornii Gray | ASHO2 |
| horse marmalade | Desmodium discolor Vogel | DEDI9 |
| horsebean | Vicia faba L. | VIFA |
| horsebush | Peltophorum dubia (Spreng.) Taubert | PEDU3 |
| horseeye bean | Mucuna sloanei Fawcett & Rendle | MUSL |
| horseeye bean | Mucuna sloanei Fawcett & Rendle var. sloanei | MUSLS |
| horseflesh mahogany | Lysiloma sabicu Benth. | LYSA5 |
| horseflyweed | Baptisia tinctoria (L.) R. Br. ex Ait. f. | BATI |
| horsegram | Macrotyloma uniflorum (Lam.) Verdc. | MAUN4 |
| horsekiller | Zornia leptophylla (Benth.) Pittier | ZOLE |
| horseshoe vetch | Hippocrepis comosa L. | HICO3 |
| Hoskett Meadows lupine | Lupinus culbertsonii Greene | LUCU |
| Hoskett Meadows lupine | Lupinus culbertsonii Greene ssp. culbertsonii | LUCUC |
| Hoskett Meadows lupine | Lupinus culbertsonii Greene ssp. hypolasius (Greene) Cox | LUCUH |
| hourglass peaseed | Sphinctospermum constrictum (S. Wats.) Rose | SPCO3 |
| Howell's lupine | Lupinus johannis-howellii C.P. Sm. | LUJO |
| Howell's milkvetch | Astragalus howellii Gray | ASHO3 |
| Huachuca Mountain lupine | Lupinus huachucanus M.E. Jones | LUHU |
| Huachuca Mountain milkvetch | Astragalus hypoxylus S. Wats. | ASHY3 |
| Huddelson's locoweed | Oxytropis huddelsonii Porsild | OXHU |
| Humboldt County milkvetch | Astragalus agnicidus Barneby | ASAG |
| Humboldt River milkvetch | Astragalus iodanthus S. Wats. | ASIO |
| Humboldt River milkvetch | Astragalus iodanthus S. Wats. var. iodanthus | ASIOI |
| Hungarian clover | Trifolium pannonicum Jacq. | TRPA22 |
| Hungarian milkvetch | Astragalus contortuplicatus L. | ASCO17 |
| Hungarian vetch | Vicia pannonica Crantz | VIPA2 |
| hyacinthbean | Lablab purpureus (L.) Sweet | LAPU6 |
| hybrid alfalfa | Medicago hybrida (Pourret) Trautv. | MEHY4 |
| hybrid lupine | Lupinus hybridus Lem. | LUHY7 |
| hymenaea | Hymenaea L. | HYMEN |
| Hymenaea verrucosa | Trachylobium verrucosum (Gaertner) Oliver | TRVE5 |
| icecream bean | Inga ingoides (L.C. Rich.) Willd. | ININ |
| icecreambean | Inga edulis C. Martius | INED |
| Idaho milkvetch | Astragalus conjunctus S. Wats. | ASCO11 |
| Idaho milkvetch | Astragalus conjunctus S. Wats. var. conjunctus | ASCOC10 |
| Idaho milkvetch | Astragalus conjunctus S. Wats. var. rickardii Welsh, K. Beck & F. Caplow | ASCOR2 |
| Illinois bundleflower | Desmanthus illinoensis (Michx.) MacM. ex B.L. Robins. & Fern. | DEIL |
| Illinois ticktrefoil | Desmodium illinoense Gray | DEIL2 |
| imbricate wattle | Acacia imbricata F. Muell. | ACIM4 |
| inchhigh lupine | Lupinus uncialis S. Wats. | LUUN |
| inconspicuous pea | Lathyrus inconspicuus L. | LAIN14 |
| Indian albizia | Albizia lebbekoides (DC.) Benth. | ALLE2 |
| Indian breadroot | Pediomelum Rydb. | PEDIO2 |
| Indian jointvetch | Aeschynomene indica L. | AEIN |
| Indian milkvetch | Astragalus australis (L.) Lam. | ASAU4 |
| Indian rattlebox | Crotalaria assamica Benth. | CRAS2 |
| Indian rosewood | Dalbergia L. f. | DALBE |
| Indian rosewood | Dalbergia latifolia Roxb. | DALA12 |
| Indian rosewood | Dalbergia sissoo Roxb. ex DC. | DASI |
| Indian rushpea | Hoffmannseggia glauca (Ortega) Eifert | HOGL2 |
| indigo | Indigofera L. | INDIG |
| Indigofera atriceps ssp. ramosa | Indigofera ramosa Cronquist | INRA2 |
| Indigofera hendecaphylla | Indigofera endecaphylla Jacq. | INEN2 |
| Indigofera hendecaphylla | Indigofera neglecta N. E. Br. | INNE2 |
| Indigofera hendecaphylla | Indigofera spicata auct. p.p., non Forssk. | INSP2 |
| Indigofera kirilowii | Indigofera macrostachya Bunge | INMA2 |
| Indigofera miniata | Indigofera leptosepala Nutt. ex Torr. & Gray | INLE |
| Indigofera miniata | Indigofera miniata Ortega var. florida Isely | INMIF |
| Indigofera miniata | Indigofera miniata Ortega var. leptosepala (Nutt. ex Torr. & Gray) B.L. Turner | INMIL |
| Indigofera miniata | Indigofera miniata Ortega var. miniata Ortega [superfluous autonym] | INMIM |
| Indigofera miniata | Indigofera miniata Ortega var. texana (Buckl.) B.L. Turner | INMIT |
| Indigofera nummulariifolia | Alysicarpus vaginalis (L.) DC. var. nummulariifolius (L.) Baker | ALVAN2 |
| Indigofera nummulariifolia | Indigofera echinata Willd. | INEC2 |
| Indigofera oxycarpa | Indigofera jamaicensis Spreng. | INJA |
| Indigofera oxycarpa | Indigofera keyensis Small | INKE |
| Indigofera oxycarpa | Indigofera mucronata auct. non Spreng. ex DC. [misapplied] | INMU80 |
| Indigofera oxycarpa | Indigofera mucronata Spreng. ex DC. var. keyensis (Small) Isely | INMUK |
| Indigofera oxycarpa | Indigofera trita L. f. var. keyensis (Small) Kartesz & Gandhi | INTRK |
| Indigofera pretoriana | Indigofera confusa Prain & Baker f., nom. illeg. [anomalous] | INCO2 |
| Indigofera sessilifolia | Indigofera patens Eckl. & Zeyh. | INPA3 |
| Indigofera tinctoria | Indigofera sumatrana Gaertn. | INSU2 |
| Indigofera trita ssp. scabra | Indigofera retroflexa Baill. | INRE2 |
| Indigofera trita ssp. subulata | Indigofera subulata Vahl ex Poiret | INSU3 |
| Indigofera zollingeriana | Indigofera teysmannii Miq. | INTE2 |
| inga | Inga P. Mill. | INGA |
| Inga ingoides | Mimosa ingoides L.C. Rich. | MIIN7 |
| Inga laurina | Inga fagifolia (L.) Willd. ex Benth., non G. Don | INFA |
| Inga nobilis ssp. quaternata | Inga quaternata Poepp. & Endl. | INQU |
| Inga vera | Inga inga (L.) Britt. | ININ2 |
| interior bush lupine | Lupinus excubitus M.E. Jones var. johnstonii C.P. Sm. | LUEXJ |
| Intermountain clover | Trifolium andinum Nutt. | TRAN2 |
| Intermountain clover | Trifolium andinum Nutt. var. andinum | TRANA3 |
| Intermountain clover | Trifolium andinum Nutt. var. podocephalum Barneby | TRANP |
| Intermountain Indian breadroot | Pediomelum megalanthum (Woot. & Standl.) Rydb. | PEME7 |
| Intermountain Indian breadroot | Pediomelum megalanthum (Woot. & Standl.) Rydb. var. epipsilum (Barneby) J. Grimes | PEMEE |
| Intermountain Indian breadroot | Pediomelum megalanthum (Woot. & Standl.) Rydb. var. megalanthum | PEMEM2 |
| Intermountain Indian breadroot | Pediomelum megalanthum (Woot. & Standl.) Rydb. var. retrorsum (Rydb.) J. Grimes | PEMER |
| Intermountain lupine | Lupinus pusillus Pursh ssp. intermontanus (Heller) D. Dunn | LUPUI2 |
| Inyo Meadow lupine | Lupinus pratensis Heller | LUPR |
| Inyo Meadow lupine | Lupinus pratensis Heller var. eriostachyus C.P. Sm. | LUPRE |
| Inyo Meadow lupine | Lupinus pratensis Heller var. pratensis | LUPRP |
| Inyo milkvetch | Astragalus inyoensis Sheldon | ASIN8 |
| Isely's milkvetch | Astragalus iselyi Welsh | ASIS |
| Isely's senna | Senna durangensis (Rose) Irwin & Barneby var. iselyi (Irwin & Barneby) Irwin & Barneby | SEDUI |
| Isely's stickpea | Calliandra iselyi B.L. Turner | CAIS2 |
| island broom | Lotus dendroideus (Greene) Greene | LODE2 |
| island broom | Lotus dendroideus (Greene) Greene var. dendroideus | LODED |
| island pea | Christia Moench | CHRIS2 |
| island sand pea | Eriosema crinitum (Kunth) G. Don | ERCR9 |
| Israel clover | Trifolium israeliticum Zohary & Katzn. | TRIS4 |
| jackbean | Canavalia Adans. | CANAV |
| jackbean | Canavalia virosa (Roxb.) Wight & Arn. | CAVI20 |
| Jacumba milkvetch | Astragalus douglasii (Torr. & Gray) Gray | ASDO |
| Jacumba milkvetch | Astragalus douglasii (Torr. & Gray) Gray var. douglasii | ASDOD |
| Jacumba milkvetch | Astragalus douglasii (Torr. & Gray) Gray var. perstrictus (Rydb.) Munz & McBurney | ASDOP2 |
| Jaeger's milkvetch | Astragalus pachypus Greene var. jaegeri Munz & McBurney | ASPAJ |
| Jamaican broom | Chamaecrista glandulosa (L.) Greene | CHGL6 |
| Jamaican broom | Chamaecrista glandulosa (L.) Greene var. glandulosa | CHGLG3 |
| Jamaican broom | Chamaecrista glandulosa (L.) Greene var. mirabilis (Pollard) Irwin & Barneby | CHGLM2 |
| James's holdback | Pomaria jamesii (Torr. & Gray) Walp. | POJA5 |
| James's prairie clover | Dalea jamesii (Torr.) Torr. & Gray | DAJA |
| jand | Prosopis cineraria (L.) Druce | PRCI4 |
| Japanese clover | Kummerowia striata (Thunb.) Schindl. | KUST2 |
| Japanese pagoda tree | Styphnolobium japonicum (L.) Schott | STJA9 |
| Japanese wisteria | Wisteria floribunda (Willd.) DC. | WIFL |
| Java-bean | Senna obtusifolia (L.) Irwin & Barneby | SEOB4 |
| jawleaf lupine | Lupinus malacophyllus Greene | LUMA2 |
| Jepson's deerweed | Lotus procumbens (Greene) Greene var. jepsonii (Ottley) Ottley | LOPRJ |
| Jepson's milkvetch | Astragalus rattanii Gray var. jepsonianus Barneby | ASRAJ |
| Jerusalem thorn | Parkinsonia aculeata L. | PAAC3 |
| Jesup's milkvetch | Astragalus robbinsii (Oakes) Gray var. jesupii Egglest. & Sheldon | ASROJ |
| jicama | Calopogonium caeruleum (Benth.) Suav. | CACA42 |
| Jim's clover | Trifolium jokerstii M. Vincent & R. Morgan | TRJO |
| Johann's locoweed | Oxytropis campestris (L.) DC. var. johannensis Fern. | OXCAJ |
| Johnson's indigobush | Psorothamnus arborescens (Torr. ex Gray) Barneby var. minutifolius (Parish) Barneby | PSARM |
| jointvetch | Aeschynomene L. | AESCH |
| Jone's oxytrope | Oxytropis oreophila Gray var. jonesii (Barneby) Barneby | OXORJ2 |
| Jones's dalea | Psorothamnus polydenius (Torr. ex S. Wats.) Rydb. var. jonesii Barneby | PSPOJ |
| Jones's lupine | Lupinus jonesii Rydb. | LUJO2 |
| Jordal's locoweed | Oxytropis campestris (L.) DC. var. jordalii (Porsild) Welsh | OXCAJ3 |
| Judas-tree | Cercis siliquastrum L. | CESI9 |
| juncea lespedeza | Lespedeza juncea (L. f.) Pers. | LEJU7 |
| juniper wattle | Acacia ulicifolia (Salisb.) Court | ACUL2 |
| Kaiparowits milkvetch | Astragalus malacoides Barneby | ASMA5 |
| Kairn's sensitive-briar | Mimosa latidens (Small) B.L. Turner | MILA15 |
| kanaloa | Kanaloa D.H. Lorence & K.R. Wood | KANAL |
| kanaloa | Kanaloa kahoolawensis D.H. Lorence & K.R. Wood | KAKA |
| karroothorn | Acacia karroo Hayne | ACKA2 |
| Kates Mountain clover | Trifolium virginicum Small ex Small & Vail | TRVI3 |
| Kauai jackbean | Canavalia kauaiensis Sauer | CAKA3 |
| Kellogg's spurred lupine | Lupinus caudatus Kellogg ssp. argophyllus (Gray) L. Phillips | LUCAA |
| Kellogg's spurred lupine | Lupinus caudatus Kellogg ssp. montigenus (Heller) Hess & D. Dunn | LUCAM |
| Kelsey's locust | Robinia hispida L. var. kelseyi (Cowell ex Hutchinson) Isely | ROHIK |
| Kennedy's milkvetch | Astragalus lentiginosus Dougl. ex Hook. var. kennedyi (Rydb.) Barneby | ASLEK |
| Kentucky coffeetree | Gymnocladus dioicus (L.) K. Koch | GYDI |
| Kentucky yellowwood | Cladrastis kentukea (Dum.-Cours.) Rudd | CLKE |
| Kenya clover | Trifolium semipilosum Fresen. | TRSE7 |
| Kenyan shower | Cassia afrofistula Brenan | CAAF2 |
| Kern County milkvetch | Astragalus subvestitus (Jepson) Barneby | ASSU8 |
| Kern milkvetch | Astragalus lentiginosus Dougl. ex Hook. var. kernensis (Jepson) Barneby | ASLEK2 |
| Kerr's milkvetch | Astragalus kerrii Knight & Cully | ASKE5 |
| Kettle Falls lupine | Lupinus minimus Dougl. ex Hook. | LUMI3 |
| keurboom | Virgilia oroboides (Bergius) Salter | VIOR6 |
| kiawe | Prosopis pallida (Humb. & Bonpl. ex Willd.) Kunth | PRPA4 |
| kidney bean | Phaseolus vulgaris L. | PHVU |
| kidneyvetch | Anthyllis L. | ANTHY |
| kidneywood | Eysenhardtia Kunth | EYSEN |
| Kincaid's lupine | Lupinus oreganus Heller var. kincaidii C.P. Sm. | LUORK |
| King's clover | Trifolium kingii S. Wats. | TRKI |
| King's clover | Trifolium kingii S. Wats. ssp. kingii | TRKIK |
| King's clover | Trifolium kingii S. Wats. ssp. macilentum (Greene) J. Gillett | TRKIM |
| King's dalea | Psorothamnus kingii (S. Wats.) Barneby | PSKI |
| King's lupine | Lupinus kingii S. Wats. | LUKI |
| King's lupine | Lupinus kingii S. Wats. var. argillaceus (Woot. & Standl.) C.P. Sm. | LUKIA |
| King's lupine | Lupinus kingii S. Wats. var. kingii | LUKIK |
| Kirilow's indigo | Indigofera kirilowii Maxim. ex Palibin | INKI |
| Klamath Basin milkvetch | Astragalus californicus (Gray) Greene | ASCA7 |
| knife acacia | Acacia cultriformis A. Cunn. ex G. Don | ACCU4 |
| Knight's milkvetch | Astragalus knightii Barneby | ASKN |
| knobthorn | Acacia nigrescens Oliv. | ACNI8 |
| knotted clover | Trifolium striatum L. | TRST5 |
| koa | Acacia koa Gray | ACKO |
| koaoha | Acacia koaia Hbd. | ACKO2 |
| Kobuk locoweed | Oxytropis kobukensis Welsh | OXKO |
| Kokrines locoweed | Oxytropis kokrinensis Porsild | OXKO2 |
| Korean clover | Kummerowia stipulacea (Maxim.) Makino | KUST |
| kowhai | Sophora microphylla Aiton | SOMI11 |
| Koyukuk locoweed | Oxytropis arctica R. Br. var. koyukukensis (Porsild) Welsh | OXARK |
| Kremmling milkvetch | Astragalus osterhoutii M.E. Jones | ASOS |
| kudzu | Pueraria DC. | PUERA |
| kudzu | Pueraria montana (Lour.) Merr. | PUMO |
| kudzu | Pueraria montana (Lour.) Merr. var. lobata (Willd.) Maesen & S. Almeida | PUMOL |
| kummerowia | Kummerowia Schindl. | KUMME |
| Kummerowia stipulacea | Lespedeza stipulacea Maxim. | LEST3 |
| Kummerowia striata | Lespedeza striata (Thunb.) Hook. & Arn. | LEST4 |
| Kura clover | Trifolium ambiguum Bieb. | TRAM15 |
| Labillardiere's clover | Trifolium billardierei Spreng. | TRBI7 |
| lablab | Lablab Adans. | LABLA |
| Lablab purpureus | Dolichos lablab L. | DOLA3 |
| Lablab purpureus | Lablab niger Medik. | LANI2 |
| Lablab purpureus | Lablab vulgaris Savi | LAVU3 |
| Lablab purpureus ssp. purpureus | Lablab leucocarpos Savi | LALE7 |
| Lackschewitz's milkvetch | Astragalus lackschewitzii Lavin & H. Marriott | ASLA26 |
| lady lupine | Lupinus villosus Willd. | LUVI |
| Lahontan milkvetch | Astragalus porrectus S. Wats. | ASPO3 |
| Lake Tahoe lupine | Lupinus meionanthus Gray | LUME |
| lanceleaf rattlebox | Crotalaria lanceolata E. Mey. | CRLA7 |
| lanceleaf ticktrefoil | Desmodium ciliare (Muhl. ex Willd.) DC. var. lancifolium Fern. & Schub. | DECIL |
| lancepod | Lonchocarpus Kunth | LONCH |
| lancepod | Lonchocarpus utilis A. C. Smith | LOUT4 |
| Lane Mountain milkvetch | Astragalus jaegerianus Munz | ASJA |
| Langsdorf's copaifera | Copaifera langsdorfii Desf. | COLA14 |
| Lanszwert's pea | Lathyrus lanszwertii Kellogg var. lanszwertii | LALAL2 |
| large Indian breadroot | Pediomelum esculentum (Pursh) Rydb. | PEES |
| large leather-root | Hoita macrostachya (DC.) Rydb. | HOMA4 |
| large yellow vetch | Vicia grandiflora Scop. | VIGR |
| large-flower hop clover | Trifolium grandiflorum Schreb. | TRGR18 |
| largebract Indian breadroot | Pediomelum cuspidatum (Pursh) Rydb. | PECU3 |
| largebract ticktrefoil | Desmodium cuspidatum (Muhl. ex Willd.) DC. ex Loud. | DECU |
| largebract ticktrefoil | Desmodium cuspidatum (Muhl. ex Willd.) DC. ex Loud. var. cuspidatum | DECUC |
| largebract ticktrefoil | Desmodium cuspidatum (Muhl. ex Willd.) DC. ex Loud. var. longifolium (Torr. & Gray) Schub. | DECUL |
| largehead clover | Trifolium macrocephalum (Pursh) Poir. | TRMA3 |
| largeleaf leather-root | Orbexilum macrophyllum (Rowlee) Rydb. | ORMA2 |
| largeleaf lupine | Lupinus burkei S. Wats. | LUBU2 |
| largeleaf lupine | Lupinus burkei S. Wats. ssp. burkei | LUBUB |
| largeleaf lupine | Lupinus burkei S. Wats. ssp. caeruleomontanus D. Dunn & Cox | LUBUC |
| largeleaf wild indigo | Baptisia alba (L.) Vent. var. macrophylla (Larisey) Isely | BAALM |
| largestipule leather-root | Orbexilum stipulatum (Torr. & Gray) Rydb. | ORST |
| lassicus lupine | Lupinus constancei T.W. & J.P. Nelson | LUCO7 |
| Lathyrus bijugatus | Lathyrus bijugatus White var. sandbergii White | LABIS2 |
| Lathyrus brachycalyx ssp. brachycalyx | Lathyrus ornatus Nutt. | LAOR2 |
| Lathyrus brachycalyx ssp. zionis | Lathyrus brachycalyx Rydb. var. zionis (C.L. Hitchc.) Welsh | LABRZ |
| Lathyrus brachycalyx ssp. zionis | Lathyrus zionis C.L. Hitchc. | LAZI3 |
| Lathyrus clymenum | Lathyrus articulatus L. | LAAR7 |
| Lathyrus eucosmus | Lathyrus brachycalyx Rydb. ssp. eucosmus (Butters & St. John) Welsh | LABRE2 |
| Lathyrus eucosmus | Lathyrus brachycalyx Rydb. var. eucosmus (Butters & St. John) Welsh | LABRE |
| Lathyrus filiformis | Lathyrus canescens (L. f.) Gren. & Godr. | LACA14 |
| Lathyrus hygrophilus | Lathyrus kilimandsharicus Taub. | LAKI3 |
| Lathyrus inconspicuus | Lathyrus erectus Lag. | LAER5 |
| Lathyrus japonicus var. japonicus | Lathyrus japonicus Willd. var. aleuticus (Greene) Fern. | LAJAA |
| Lathyrus japonicus var. maritimus | Lathyrus japonicus Willd. ssp. maritimus (L.) P.W. Ball | LAJAM2 |
| Lathyrus japonicus var. maritimus | Lathyrus japonicus Willd. var. glaber (Ser.) Fern. | LAJAG |
| Lathyrus japonicus var. maritimus | Lathyrus maritimus Bigelow | LAMA3 |
| Lathyrus japonicus var. maritimus | Lathyrus maritimus Bigelow var. glaber (Ser.) Eames | LAMAG2 |
| Lathyrus japonicus var. maritimus | Pisum maritimum L. | PIMA10 |
| Lathyrus japonicus var. maritimus | Pisum maritimum L. var. glabrum Ser. | PIMAG |
| Lathyrus japonicus var. pellitus | Lathyrus maritimus Bigelow var. pellitus (Fern.) Gleason | LAMAP2 |
| Lathyrus japonicus var. pubescens | Lathyrus maritimus Bigelow ssp. pubescens (Hartman) Regel | LAMAP3 |
| Lathyrus jepsonii | Lathyrus jepsonii Greene var. jepsonii Greene [superfluous autonym] | LAJEJ2 |
| Lathyrus jepsonii ssp. californicus | Lathyrus jepsonii Greene var. californicus (S. Wats.) Hoover | LAJEC2 |
| Lathyrus jepsonii ssp. californicus | Lathyrus watsonii White | LAWA5 |
| Lathyrus laetivirens | Lathyrus lanszwertii Kellogg var. laetivirens (Greene ex Rydb.) Welsh | LALAL |
| Lathyrus laetivirens | Lathyrus lanszwertii Kellogg var. pallescens Barneby | LALAP |
| Lathyrus laetivirens | Lathyrus leucanthus Rydb. var. laetivirens (Greene ex Rydb.) C.L. Hitchc. | LALEL |
| Lathyrus lanszwertii var. aridus | Lathyrus lanszwertii Kellogg ssp. aridus (Piper) Bradshaw | LALAA6 |
| Lathyrus lanszwertii var. brownii | Lathyrus brownii Eastw. | LABR2 |
| Lathyrus lanszwertii var. brownii | Lathyrus pauciflorus Fern. ssp. brownii (Eastw.) Piper | LAPAB |
| Lathyrus lanszwertii var. brownii | Lathyrus schaffneri Rydb. | LASC7 |
| Lathyrus lanszwertii var. leucanthus | Lathyrus arizonicus Britt. | LAAR6 |
| Lathyrus lanszwertii var. leucanthus | Lathyrus lanszwertii Kellogg var. arizonicus (Britt.) Welsh | LALAA3 |
| Lathyrus lanszwertii var. leucanthus | Lathyrus leucanthus Rydb. | LALE2 |
| Lathyrus lanszwertii var. tracyi | Lathyrus tracyi Bradshaw | LATR |
| Lathyrus latifolius | Lathyrus latifolius L. var. splendens Groenl. & Rumpler | LALAS2 |
| Lathyrus linifolius | Lathyrus montanus Bernh. | LAMO6 |
| Lathyrus nevadensis | Lathyrus nevadensis S. Watson var. nevadensis S. Watson [superfluous autonym] | LANEN3 |
| Lathyrus nevadensis ssp. cusickii | Lathyrus cusickii S. Wats. | LACU2 |
| Lathyrus nevadensis ssp. lanceolatus var. nuttallii | Lathyrus lanceolatus T.J. Howell | LALA14 |
| Lathyrus nevadensis ssp. lanceolatus var. nuttallii | Lathyrus nuttallii S. Wats. | LANU |
| Lathyrus palustris | Lathyrus myrtifolius Muhl. ex Willd. | LAMY |
| Lathyrus palustris | Lathyrus palustris L. ssp. pilosus (Cham.) Hult | LAPAP3 |
| Lathyrus palustris | Lathyrus palustris L. var. linearifolius Ser. | LAPAL |
| Lathyrus palustris | Lathyrus palustris L. var. macranthus (White) Fern. | LAPAM2 |
| Lathyrus palustris | Lathyrus palustris L. var. meridionalis Butters & St. John | LAPAM3 |
| Lathyrus palustris | Lathyrus palustris L. var. myrtifolius (Muhl. ex Willd.) Gray | LAPAM |
| Lathyrus palustris | Lathyrus palustris L. var. pilosus (Cham.) Ledeb. | LAPAP |
| Lathyrus palustris | Lathyrus palustris L. var. retusus Fern. & St. John | LAPAR |
| Lathyrus palustris | Orobus myrtifolius (Muhl. ex Willd.) A. Hall | ORMY |
| Lathyrus pauciflorus var. pauciflorus | Lathyrus pauciflorus Fern. var. tenuior (Piper) St. John | LAPAT |
| Lathyrus pauciflorus var. utahensis | Lathyrus pauciflorus Fern. ssp. utahensis (M.E. Jones) Piper | LAPAU2 |
| Lathyrus polymorphus | Lathyrus stipulaceus (Pursh) Butlers & St. John | LAST11 |
| Lathyrus polymorphus ssp. incanus | Lathyrus incanus (Sm. & Rydb.) Rydb. | LAIN11 |
| Lathyrus polymorphus ssp. incanus | Lathyrus polymorphus Nutt. var. incanus (Sm. & Rydb.) Dorn | LAPOI2 |
| Lathyrus polymorphus ssp. incanus | Lathyrus stipulaceus (Pursh) Butters & H. St. John var. incanus (J. G. Sm. & Rydb.) Butters & H. St. John | LASTI2 |
| Lathyrus polymorphus ssp. polymorphus var. polymorphus | Lathyrus decaphyllus Pursh | LADE4 |
| Lathyrus sulphureus var. sulphureus | Lathyrus nevadensis S. Wats. ssp. stipulaceous (White) Bradshaw | LANES |
| Lathyrus venosus | Lathyrus oreophilus Woot. & Standl. | LAOR |
| Lathyrus venosus | Lathyrus venosus Muhl. ex Willd. ssp. arkansanus (Fassett) C.L. Hitchc. | LAVEA2 |
| Lathyrus venosus | Lathyrus venosus Muhl. ex Willd. var. arkansanus Fassett | LAVEA3 |
| Lathyrus venosus | Lathyrus venosus Muhl. ex Willd. var. intonsus Butters & St. John | LAVEI |
| Lathyrus venosus | Lathyrus venosus Muhl. ex Willd. var. meridionalis Butters & St. John | LAVEM |
| Lathyrus vernus | Lathyrus vernus (L.) Bernh. | LAVER |
| Lathyrus vestitus | Lathyrus vestitus Nutt. var. vestitus Nutt. [superfluous autonym] | LAVEV4 |
| Lathyrus vestitus ssp. alefeldii | Lathyrus alefeldii White | LAAL4 |
| Lathyrus vestitus ssp. alefeldii | Lathyrus laetiflorus Greene ssp. alefeldii (White) C.L. Hitchc. | LALAA2 |
| Lathyrus vestitus ssp. alefeldii | Lathyrus laetiflorus Greene var. alefeldii (White) Jepson | LALAA7 |
| Lathyrus vestitus ssp. alefeldii | Lathyrus strictus Nutt. | LAST7 |
| Lathyrus vestitus ssp. alefeldii | Lathyrus vestitus Nutt. var. alefeldii (White) Isley | LAVEA4 |
| Lathyrus vestitus ssp. bolanderi | Lathyrus bolanderi S. Wats. | LABO4 |
| Lathyrus vestitus ssp. bolanderi | Lathyrus ochropetalus Piper | LAOC4 |
| Lathyrus vestitus ssp. bolanderi | Lathyrus peckii Piper | LAPE4 |
| Lathyrus vestitus ssp. bolanderi | Lathyrus polyphyllus Nutt. var. insecundus Jepson | LAPOI3 |
| Lathyrus vestitus ssp. bolanderi | Lathyrus vestitus Nutt. ssp. ochropetalus (Piper) C.L. Hitchc. | LAVEO |
| Lathyrus vestitus ssp. bolanderi | Lathyrus vestitus Nutt. var. ochropetalus (Piper) Isley | LAVEO2 |
| Lathyrus vestitus ssp. laetiflorus | Lathyrus laetiflorus Greene | LALA2 |
| Lathyrus vestitus ssp. laetiflorus | Lathyrus laetiflorus Greene ssp. barbarae (White) C.L. Hitchc. | LALAB |
| Lathyrus vestitus ssp. laetiflorus | Lathyrus laetiflorus Greene ssp. glaber C.L. Hitchc. | LALAG |
| Lathyrus vestitus ssp. laetiflorus | Lathyrus strictus Nutt. var. barbarae (White) Jepson | LASTB |
| Lathyrus vestitus ssp. laetiflorus | Lathyrus strictus Nutt. var. thacherae Jepson | LASTT |
| Lathyrus vestitus ssp. laetiflorus | Lathyrus venosus Muhl. ex Willd. var. grandiflorus Torr. | LAVEG |
| Lathyrus vestitus ssp. laetiflorus | Lathyrus violaceus Greene var. barbarae White | LAVIB |
| Lathyrus vestitus ssp. vestitus | Lathyrus puberulus White ex Greene | LAPU7 |
| Lathyrus vestitus ssp. vestitus | Lathyrus quercetorum Heller | LAQU2 |
| Lathyrus vestitus ssp. vestitus | Lathyrus vestitus Nutt. ssp. puberulus (White ex Greene) C.L. Hitchc. | LAVEP |
| Lathyrus vestitus ssp. vestitus | Lathyrus vestitus Nutt. var. violaceus (Greene) Abrams | LAVEV2 |
| Lathyrus vestitus ssp. vestitus | Lathyrus violaceus Greene | LAVI3 |
| laurel-leaf pigeonwings | Clitoria laurifolia Poir. | CLLA4 |
| Laurent's milkvetch | Astragalus collinus (Hook.) Dougl. ex G. Don var. laurentii (Rydb.) Barneby | ASCOL |
| lavafield jackbean | Canavalia pubescens Hook. & Arn. | CAPU14 |
| Lavin's milkvetch | Astragalus oophorus S. Wats. var. lavinii Barneby | ASOOL3 |
| Laxmann's milkvetch | Astragalus laxmannii Jacq. | ASLA27 |
| leadplant | Amorpha canescens Pursh | AMCA6 |
| leadtree | Leucaena Benth. | LEUCA |
| Leadville milkvetch | Astragalus molybdenus Barneby | ASMO8 |
| leafy broom | Genista stenopetala Webb & Berth. | GEST9 |
| leafy lespedeza | Lespedeza cyrtobotrya Miq. | LECY80 |
| leafy pea | Lathyrus polyphyllus Nutt. | LAPO3 |
| leafy prairie clover | Dalea foliosa (Gray) Barneby | DAFO2 |
| least snoutbean | Rhynchosia minima (L.) DC. | RHMI4 |
| leather-root | Hoita Rydb. | HOITA |
| leather-root | Orbexilum Raf. | ORBEX |
| Leavenworth's vetch | Vicia ludoviciana Nutt. ssp. leavenworthii (Torr. & Gray) Lassetter & Gunn. | VILUL4 |
| Leiberg's clover | Trifolium leibergii A. Nels. & J.F. Macbr. | TRLE |
| Leiberg's milkvetch | Astragalus leibergii M.E. Jones | ASLE5 |
| Leichardt-bean | Cassia brewsteri (F. Muell.) F. Muell. ex Benth. | CABR41 |
| Lemhi milkvetch | Astragalus aquilonius (Barneby) Barneby | ASAQ2 |
| Lemmon's clover | Trifolium lemmonii S. Wats. | TRLE2 |
| Lemmon's cologania | Cologania obovata Schlecht. | COOB14 |
| Lemmon's lupine | Lupinus lemmonii C.P. Sm. | LULE |
| Lemmon's milkvetch | Astragalus lemmonii Gray | ASLE6 |
| lemon scurfpea | Psoralidium lanceolatum (Pursh) Rydb. | PSLA3 |
| Lens culinaris | Cicer lens Willd. | CILE3 |
| Lens culinaris | Ervum lens L. | ERLE15 |
| Lens culinaris | Lens esculenta Moench | LEES |
| lens pod milkvetch | Astragalus lentiformis Gray ex Brewer & S. Wats. | ASLE7 |
| lentil | Lens culinaris Medik. | LECU2 |
| lentil | Lens P. Mill. | LENS |
| lentil vetch | Vicia tetrasperma (L.) Schreb. | VITE |
| lespedeza | Lespedeza Michx. | LESPE |
| lespedeza | Lespedeza potaninii Vassiliev | LEPO15 |
| Lespedeza ?brittonii | Lespedeza procumbens Michx. var. elliptica Blake | LEPRE |
| Lespedeza ?longifolia | Lespedeza hirta (L.) Hornem. var. dissimulans Fern. | LEHID2 |
| Lespedeza ?longifolia | Lespedeza hirta (L.) Hornem. var. longifolia (DC.) Fern. | LEHIL |
| Lespedeza ?manniana | Lespedeza nuttallii Darl. var. manniana (Mackenzie & Bush) Gleason | LENUM2 |
| Lespedeza ?neglecta | Lespedeza stuevei Nutt. var. angustifolia Britt., non Pursh | LESTA |
| Lespedeza ?oblongifolia | Lespedeza hirta (L.) Hornem. var. appressipilis Blake | LEHIA |
| Lespedeza angustifolia | Lespedeza angustifolia (Pursh) Ell. var. brevifolia Britt. | LEANB |
| Lespedeza angustifolia | Lespedeza hirta (L.) Hornem. var. intercursa Fern. | LEHII |
| Lespedeza capitata | Lespedeza bicknellii House | LEBI5 |
| Lespedeza capitata | Lespedeza capitata Michx. var. stenophylla Bissell & Fern. | LECAS |
| Lespedeza capitata | Lespedeza capitata Michx. var. velutina (Bickn.) Fern. | LECAV2 |
| Lespedeza capitata | Lespedeza capitata Michx. var. vulgaris Torr. & Gray | LECAV4 |
| Lespedeza cuneata | Lespedeza juncea (L. f.) Pers. var. sericea Forbes & Hemsley | LEJUS |
| Lespedeza cuneata | Lespedeza sericea Miq. | LESE12 |
| Lespedeza cuneata var. serpens | Lespedeza latissima (Matsum.) Nakai | LELA31 |
| Lespedeza cuneata var. serpens | Lespedeza serpens Nakai | LESE13 |
| Lespedeza formosa | Desmodium formosum Vogel | DEFO3 |
| Lespedeza frutescens | Lespedeza intermedia (S. Wats.) Britt. | LEIN30 |
| Lespedeza frutescens | Lespedeza violacea auct. non (L.) Pers. [misapplied] | LEVI23 |
| Lespedeza hirta ssp. curtissii | Lespedeza hirta (L.) Hornem. var. curtissii (Clewell) Isely | LEHIC2 |
| Lespedeza hirta ssp. hirta | Lespedeza capitata Michx. var. calycina (Schindl.) Fern. | LECAC3 |
| Lespedeza hirta ssp. hirta | Lespedeza hirta (L.) Hornem. var. sparsiflora Torr. & Gray | LEHIS |
| Lespedeza hirta ssp. hirta | Lespedeza polystachya Michx. | LEPO3 |
| Lespedeza juncea | Lespedeza hedysaroides (Pall.) Kitag. | LEHE10 |
| Lespedeza juncea | Lespedeza inschanica (Maxim.) Schindl. | LEIN24 |
| Lespedeza maximowiczii | Lespedeza maximowiczii C. K. Schneid. var. tomentella (Nakai) Nakai | LEMAT2 |
| Lespedeza maximowiczii | Lespedeza maximowiczii C. K. Schneid. var. tricolor (Nakai) Nakai | LEMAT3 |
| Lespedeza repens | Hedysarum repens L. | HERE7 |
| Lespedeza violacea | Hedysarum violaceum L. | HEVI7 |
| Lespedeza violacea | Lespedeza intermedia sensu Clewell, 1966 | LEIN2 |
| Lespedeza violacea | Lespedeza prairea (Mackenzie & Bush) Britt. | LEPR5 |
| lesser rushy milkvetch | Astragalus convallarius Greene | ASCO12 |
| lesser rushy milkvetch | Astragalus convallarius Greene var. convallarius | ASCOC9 |
| lesser rushy milkvetch | Astragalus convallarius Greene var. finitimus Barneby | ASCOF |
| lesser rushy milkvetch | Astragalus convallarius Greene var. margaretiae Barneby | ASCOM4 |
| lesser rushy milkvetch | Astragalus convallarius Greene var. scopulorum Barneby | ASCOS |
| Lessertia microphylla | Sutherlandia microphylla Burch. ex DC. | SUMI2 |
| Leucaena leucocephala ssp. leucocephala | Leucaena glauca auct. non (L.) Benth. [misapplied] | LEGL5 |
| Leucaena leucocephala ssp. leucocephala | Mimosa leucocephala Lam. | MILE7 |
| licorice | Glycyrrhiza L. | GLYCY |
| licorice milkvetch | Astragalus glycyphyllos L. | ASGL4 |
| light yellow lupine | Lupinus lutescens C.P. Sm. | LULU4 |
| Ligurian clover | Trifolium ligusticum Balb. ex Loisel. | TRLI7 |
| limestone glade milkvetch | Astragalus bibullatus Barneby & Bridges | ASBI6 |
| limestone milkvetch | Astragalus titanophilus Barneby | ASTI2 |
| limestone senna | Senna racemosa (P. Mill.) Irwin & Barneby [excluded] | SERA5 |
| Lindheimer's hoarypea | Tephrosia lindheimeri Gray | TELI |
| Lindheimer's indigo | Indigofera lindheimeriana Scheele | INLI |
| Lindheimer's milkvetch | Astragalus lindheimeri Engelm. ex Gray | ASLI4 |
| Lindheimer's ticktrefoil | Desmodium lindheimeri Vail | DELI |
| little bun milkvetch | Astragalus simplicifolius (Nutt.) Gray | ASSI4 |
| Little Kern milkvetch | Astragalus shevockii Barneby | ASSH5 |
| little white bird's-foot | Ornithopus perpusillus L. | ORPE80 |
| littleleaf false tamarind | Lysiloma watsonii Rose | LYWA |
| littleleaf greentwig | Brongniartia minutifolia S. Wats. | BRMI4 |
| littleleaf leadtree | Leucaena retusa Benth. | LERE5 |
| littleleaf milkpea | Galactia microphylla (Chapman) H.J. Rogers ex Hall & Ward | GAMI3 |
| littleleaf peashrub | Caragana microphylla Lam. | CAMI48 |
| littleleaf sensitive-briar | Mimosa microphylla Dry. | MIMI22 |
| Loa milkvetch | Astragalus welshii Barneby | ASWE4 |
| locoweed | Oxytropis DC. | OXYTR |
| locust | Gleditsia L. | GLEDI |
| locust | Robinia L. | ROBIN |
| lodgepole lupine | Lupinus parviflorus Nutt. ex Hook. & Arn. | LUPA8 |
| lodgepole lupine | Lupinus parviflorus Nutt. ex Hook. & Arn. ssp. floribundus (Greene) Harmon | LUPAF |
| lodgepole lupine | Lupinus parviflorus Nutt. ex Hook. & Arn. ssp. myrianthus (Greene) Harmon | LUPAM2 |
| lodgepole lupine | Lupinus parviflorus Nutt. ex Hook. & Arn. ssp. myrianthus (Greene) Harmon var. fulvomaculatus (Payson) Harmon | LUPAF4 |
| lodgepole lupine | Lupinus parviflorus Nutt. ex Hook. & Arn. ssp. myrianthus (Greene) Harmon var. myrianthus | LUPAM4 |
| lodgepole lupine | Lupinus parviflorus Nutt. ex Hook. & Arn. ssp. parviflorus | LUPAP4 |
| lollipop mimosa | Mimosa pellita Kunth ex Willd. | MIPE2 |
| Loma prieta | Hoita strobilina (Hook. & Arn.) Rydb. | HOST3 |
| lonchocarpus | Lonchocarpus cyanescens (Schumacher & Thonn.) Benth. | LOCY2 |
| Lonchocarpus heptaphyllus | Lonchocarpus latifolius Kunth ex DC. | LOLA5 |
| Lonchocarpus heptaphyllus | Lonchocarpus pentaphyllus (Poir.) Kunth ex DC. | LOPE5 |
| Lonchocarpus punctatus | Lonchocarpus violaceus auct. p.p., non (Jacq.) Kunth ex DC. | LOVI2 |
| Lone Pine milkvetch | Astragalus sepultipes (Barneby) Barneby | ASSE3 |
| long lupine | Lupinus peirsonii Mason | LUPE2 |
| Long Valley milkvetch | Astragalus johannis-howellii Barneby | ASJO |
| long-pod-cassia | Cassia abbreviata Oliver | CAAB13 |
| longbeak rattlebox | Crotalaria longirostrata Hook. & Arn. | CRLO3 |
| longbract wild indigo | Baptisia bracteata Muhl. ex Ell. | BABR2 |
| longbract wild indigo | Baptisia bracteata Muhl. ex Ell. var. bracteata | BABRB |
| longbract wild indigo | Baptisia bracteata Muhl. ex Ell. var. laevicaulis (Gray ex Canby) Isely | BABRL |
| longbract wild indigo | Baptisia bracteata Muhl. ex Ell. var. leucophaea (Nutt.) Kartesz & Gandhi | BABRL2 |
| longleaf bush lupine | Lupinus longifolius (S. Wats.) Abrams | LULO |
| longleaf cologania | Cologania angustifolia Kunth | COAN |
| longleaf cowpea | Vigna longifolia (Benth.) Verdc. | VILO6 |
| longleaf milkpea | Galactia longifolia (Jacq.) Benth. ex Hoehne | GALO |
| longspur lupine | Lupinus arbustus Dougl. ex Lindl. | LUAR6 |
| longspur lupine | Lupinus arbustus Dougl. ex Lindl. ssp. arbustus | LUARA3 |
| longspur lupine | Lupinus arbustus Dougl. ex Lindl. ssp. arbustus var. arbustus | LUARA10 |
| longspur lupine | Lupinus arbustus Dougl. ex Lindl. ssp. arbustus var. montanus (T.J. Howell) D. Dunn | LUARM4 |
| longspur lupine | Lupinus arbustus Dougl. ex Lindl. ssp. calcaratus (Kellogg) D. Dunn | LUARC |
| longspur lupine | Lupinus arbustus Dougl. ex Lindl. ssp. neolaxiflorus D. Dunn | LUARN |
| longspur lupine | Lupinus arbustus Dougl. ex Lindl. ssp. pseudoparviflorus (Rydb.) D. Dunn | LUARP |
| longspur lupine | Lupinus arbustus Dougl. ex Lindl. ssp. silvicola (Heller) D. Dunn | LUARS |
| longstalk clover | Trifolium longipes Nutt. | TRLO |
| longstalk clover | Trifolium longipes Nutt. ssp. atrorubens (Greene) J. Gillett | TRLOA |
| longstalk clover | Trifolium longipes Nutt. ssp. caurinum (Piper) J. Gillett | TRLOC |
| longstalk clover | Trifolium longipes Nutt. ssp. longipes | TRLOL3 |
| longstalk clover | Trifolium longipes Nutt. ssp. multipedunculatum (Kennedy) J. Gillett | TRLOM |
| longstalk clover | Trifolium longipes Nutt. ssp. pedunculatum (Rydb.) J. Gillett | TRLOP |
| longstalk clover | Trifolium longipes Nutt. ssp. shastense (House) J. Gillett | TRLOS2 |
| looseflower milkvetch | Astragalus tenellus Pursh | ASTE5 |
| lotononis | Lotononis (DC.) Ecklon & Zeyh. | LOTON2 |
| lotononis | Lotononis bainesii Baker | LOBA5 |
| Lotononis listii | Listia heterophylla E. Mey. | LIHE5 |
| Lotus aboriginus | Hosackia rosea Eastw. | HORO3 |
| Lotus aboriginus | Lotus crassifolius (Benth.) Greene var. subglaber (Ottley) C.L. Hitchc. | LOCRS |
| Lotus aboriginus | Lotus stipularis (Benth.) Greene var. subglaber Ottley | LOSTS3 |
| Lotus alamosanus | Hosackia alamosana Rose | HOAL2 |
| Lotus alpinus | Lotus corniculatus L. var. alpinus Ser. | LOCOA2 |
| Lotus angustissimus | Lotus corniculatus L. var. ciliatus (Ten.) W. D. J. Koch | LOCOC4 |
| Lotus argophyllus var. adsurgens | Lotus argophyllus (Gray) Greene ssp. adsurgens (Dunkle) Raven | LOARA |
| Lotus argophyllus var. argenteus | Hosackia ornithopa Greene | HOOR4 |
| Lotus argophyllus var. argenteus | Hosackia ornithopa Greene ssp. venusta (Eastw.) Abrams | HOORV |
| Lotus argophyllus var. argenteus | Lotus argophyllus (Gray) Greene ssp. ornithopus (Greene) Raven | LOARO |
| Lotus argophyllus var. argenteus | Lotus argophyllus (Gray) Greene var. ornithopus (Greene) Ottley | LOARO2 |
| Lotus argophyllus var. argophyllus | Hosackia argophylla Gray | HOAR2 |
| Lotus argophyllus var. argophyllus | Hosackia argophylla Gray var. decora I.M. Johnston | HOARD |
| Lotus argophyllus var. argophyllus | Lotus argophyllus (Gray) Greene ssp. decorus (I.M. Johnston) Munz | LOARD |
| Lotus argophyllus var. argophyllus | Lotus argophyllus (Gray) Greene var. decorus (I.M. Johnston) Ottley | LOARD2 |
| Lotus argophyllus var. fremontii | Hosackia fremontii (Gray) Abrams | HOFR2 |
| Lotus argophyllus var. niveus | Hosackia nivea (Greene) S. Wats. | HONI2 |
| Lotus argophyllus var. niveus | Lotus argophyllus (Gray) Greene ssp. niveus (Greene) Munz | LOARN |
| Lotus argophyllus var. niveus | Lotus niveus Greene | LONI2 |
| Lotus argyraeus var. argyraeus | Hosackia argyraea Greene | HOAR3 |
| Lotus argyraeus var. multicaulis | Hosackia wrightii Gray ssp. multicaulis (Ottley) Abrams | HOWRM |
| Lotus argyraeus var. multicaulis | Hosackia wrightii Gray var. multicaulis Ottley | HOWRM2 |
| Lotus argyraeus var. multicaulis | Lotus argyraeus (Greene) Greene ssp. multicaulis (Ottley) Munz | LOARM2 |
| Lotus benthamii | Hosackia cystoides Benth. | HOCY |
| Lotus benthamii | Lotus scoparius (Nutt.) Ottley var. perplexans Hoover p.p. | LOSCP2 |
| Lotus conjugatus ssp. requienii | Tetragonolobus requienii (Mauri ex Sanguin.) Sanguin. | TERE7 |
| Lotus corniculatus | Lotus corniculatus L. var. arvensis (Schkuhr) Ser. ex DC. | LOCOA |
| Lotus corniculatus ssp. frondosus | Lotus frondosus (Freyn) Kuprian. | LOFR3 |
| Lotus corniculatus var. corniculatus | Lotus caucasicus Kuprian. | LOCA15 |
| Lotus corniculatus var. corniculatus | Lotus filicaulis Durieu | LOFI2 |
| Lotus crassifolius var. crassifolius | Hosackia crassifolia Benth. | HOCR2 |
| Lotus creticus | Lotus commutatus Guss. | LOCO12 |
| Lotus dendroideus var. dendroideus | Hosackia dendroidea (Greene) Abrams | HODE6 |
| Lotus dendroideus var. dendroideus | Lotus scoparius (Nutt.) Ottley var. dendroideus (Greene) Ottley | LOSCD |
| Lotus dendroideus var. traskiae | Lotus scoparius (Nutt.) Ottley ssp. traskiae (Eastw. ex Noddin) Raven | LOSCT2 |
| Lotus dendroideus var. veatchii | Lotus scoparius (Nutt.) Ottley var. veatchii (Greene) Ottley | LOSCV |
| Lotus denticulatus | Hosackia denticulata E. Drew | HODE5 |
| Lotus discolor | Lotus brandianus Harms | LOBR8 |
| Lotus formosissimus | Hosackia gracilis Benth. | HOGR |
| Lotus glaber | Lotus corniculatus L. var. tenuifolius L. | LOCOT |
| Lotus glaber | Lotus tenuis Waldst. & Kit. ex Willd. | LOTE4 |
| Lotus grandiflorus var. grandiflorus | Hosackia grandiflora Benth. | HOGR2 |
| Lotus grandiflorus var. grandiflorus | Hosackia leucophaea (Greene) Abrams | HOLE2 |
| Lotus grandiflorus var. grandiflorus | Lotus grandiflorus (Benth.) Greene var. mutabilis Ottley | LOGRM2 |
| Lotus grandiflorus var. macranthus | Lotus macranthus Greene | LOMA81 |
| Lotus halophilus | Lotus pusillus Viv., nom. illeg. [anomalous] | LOPU8 |
| Lotus haydonii | Hosackia haydonii Orcutt | HOHA2 |
| Lotus heermannii var. heermannii | Hosackia tomentosa Hook. & Arn. ssp. glabriuscula (Hook. & Arn.) Abrams | HOTOG |
| Lotus heermannii var. orbicularis | Hosackia tomentosa Hook. & Arn. | HOTO |
| Lotus heermannii var. orbicularis | Lotus eriophorus Greene | LOER4 |
| Lotus heermannii var. orbicularis | Lotus heermannii (Dur. & Hilg.) Greene var. eriophorus (Greene) Ottley | LOHEE |
| Lotus humistratus | Hosackia brachycarpa Benth. | HOBR3 |
| Lotus incanus | Hosackia incana Torr. | HOIN3 |
| Lotus incanus | Lotus neoincanus Munz | LONE5 |
| Lotus junceus var. biolettii | Lotus biolettii Greene | LOBI2 |
| Lotus junceus var. junceus | Hosackia juncea Benth. | HOJU2 |
| Lotus junceus var. junceus | Lotus biolettii Greene var. spiralis Hoover | LOBIS2 |
| Lotus macrotrichus | Lotus divaricatus Boiss., nom. illeg. [anomalous] | LODI5 |
| Lotus maritimus | Lotus siliquosus L., nom. illeg. [anomalous] | LOSI4 |
| Lotus maritimus | Tetragonolobus siliquosus Roth | TESI3 |
| Lotus micranthus | Hosackia parviflora Benth. | HOPA4 |
| lotus milkvetch | Astragalus lotiflorus Hook. | ASLO4 |
| Lotus nevadensis var. davidsonii | Hosackia sulphurea (Greene) Abrams | HOSU2 |
| Lotus nevadensis var. davidsonii | Lotus davidsonii Greene | LODA4 |
| Lotus nevadensis var. douglasii | Hosackia decumbens Benth. | HODE4 |
| Lotus nevadensis var. douglasii | Lotus douglasii Greene | LODO6 |
| Lotus nevadensis var. nevadensis | Hosackia nevadensis (S. Wats.) Parish | HONE2 |
| Lotus nevadensis var. nevadensis | Lotus douglasii Greene var. nevadensis (S. Wats.) Ottley | LODON |
| Lotus nuttallianus | Hosackia prostrata Nutt. | HOPR2 |
| Lotus oblongifolius var. cupreus | Hosackia cuprea (Greene) Smiley | HOCU2 |
| Lotus oblongifolius var. cupreus | Lotus cupreus Greene | LOCU3 |
| Lotus oblongifolius var. oblongifolius | Hosackia lathyroides Dur. & Hilg. | HOLA4 |
| Lotus oblongifolius var. oblongifolius | Hosackia oblongifolia Benth. | HOOB2 |
| Lotus oblongifolius var. oblongifolius | Hosackia torreyi Gray | HOTO3 |
| Lotus oblongifolius var. oblongifolius | Lotus oblongifolius (Benth.) Greene var. nevadensis (Gray) Munz | LOOBN |
| Lotus oblongifolius var. oblongifolius | Lotus oblongifolius (Benth.) Greene var. torreyi (Gray) Ottley | LOOBT |
| Lotus oblongifolius var. oblongifolius | Lotus torreyi (Gray) Greene | LOTO4 |
| Lotus palaestinus | Tetragonolobus palaestinus Boiss. & Blanche | TEPA4 |
| Lotus palustris | Lotus lamprocarpus Boiss. | LOLA6 |
| Lotus parviflorus | Lotus hispidus Desf. ex DC. | LOHI7 |
| Lotus pedunculatus | Lotus decumbens Poir. | LODE5 |
| Lotus pedunculatus | Lotus pedunculatus Cav. var. villosus (Lamotte) O. Bolos & Vigo | LOPEV2 |
| Lotus pedunculatus | Lotus uliginosus Schkuhr | LOUL |
| Lotus peregrinus var. carmeli | Lotus carmeli Boiss. | LOCA14 |
| Lotus pinnatus | Hosackia pinnata (Hook.) Abrams | HOPI |
| Lotus plebeius | Hosackia puberula Benth. var. nana Gray | HOPUN |
| Lotus plebeius | Lotus ?nummularius (M.E. Jones) Tidestrom | LONU5 |
| Lotus plebeius | Lotus longebracteatus Rydb. | LOLO |
| Lotus plebeius | Lotus neomexicanus Greene | LONE3 |
| Lotus plebeius | Lotus oroboides (Kunth) Ottley var. nanus (Gray) Isely | LOORN |
| Lotus plebeius | Lotus oroboides (Kunth) Ottley var. nummularius (M.E. Jones) Isely | LOORN2 |
| Lotus plebeius | Lotus oroboides auct. non (Kunth) Ottley [misapplied] | LOOR2 |
| Lotus procumbens var. jepsonii | Hosackia sericea Benth. ssp. jepsonii (Ottley) Abrams | HOSEJ |
| Lotus procumbens var. procumbens | Hosackia sericea Benth. | HOSE4 |
| Lotus rigidus | Hosackia rigida Benth. | HORI3 |
| Lotus salsuginosus var. brevivexillus | Hosackia humilis (Greene) Abrams | HOHU2 |
| Lotus salsuginosus var. brevivexillus | Lotus salsuginosus Greene ssp. brevivexillus (Ottley) Munz | LOSAB2 |
| Lotus salsuginosus var. salsuginosus | Hosackia maritima Nutt. | HOMA5 |
| Lotus scoparius var. brevialatus | Hosackia glabra (Vogel) Torr. var. brevialata (Ottley) Abrams | HOGLB |
| Lotus scoparius var. brevialatus | Lotus scoparius (Nutt.) Ottley ssp. brevialatus (Ottley) Munz | LOSCB2 |
| Lotus scoparius var. scoparius | Hosackia glabra (Vogel) Torr. | HOGL6 |
| Lotus scoparius var. scoparius | Lotus scoparius (Nutt.) Ottley var. perplexans Hoover p.p. | LOSCP2 |
| Lotus stipularis var. stipularis | Hosackia stipularis Benth. | HOST5 |
| Lotus stipularis var. stipularis | Hosackia stipularis Benth. ssp. balsamifera (Kellogg) Abrams | HOSTB |
| Lotus stipularis var. stipularis | Lotus balsamiferus (Kellogg) Greene | LOBA |
| Lotus strigosus var. hirtellus | Hosackia strigosa Nutt. var. hirtella (Greene) Hall | HOSTH |
| Lotus strigosus var. strigosus | Hosackia rubella Nutt. | HORU3 |
| Lotus strigosus var. strigosus | Hosackia strigosa Nutt. | HOST6 |
| Lotus strigosus var. strigosus | Lotus rubellus (Nutt.) Greene | LORU2 |
| Lotus strigosus var. tomentellus | Hosackia tomentella (Greene) Abrams | HOTO2 |
| Lotus strigosus var. tomentellus | Lotus intricatus Eastw. | LOIN8 |
| Lotus strigosus var. tomentellus | Lotus tomentellus Greene | LOTO7 |
| Lotus unifoliolatus var. helleri | Acmispon helleri (Britt.) Heller | ACHE5 |
| Lotus unifoliolatus var. helleri | Lotus helleri Britt. | LOHE3 |
| Lotus unifoliolatus var. helleri | Lotus purshianus F.E. & E.G. Clem. var. helleri (Britt.) Isely | LOPUH |
| Lotus unifoliolatus var. unifoliolatus | Acmispon americanum (Nutt.) Rydb. | ACAM4 |
| Lotus unifoliolatus var. unifoliolatus | Hosackia americana (Nutt.) Piper | HOAM |
| Lotus unifoliolatus var. unifoliolatus | Lotus americanus (Nutt.) Bisch., non Vell. | LOAM5 |
| Lotus unifoliolatus var. unifoliolatus | Lotus purshianus F.E. & E.G. Clem. | LOPU3 |
| Lotus unifoliolatus var. unifoliolatus | Lotus purshianus F.E. & E.G. Clem. var. glaber (Nutt.) Munz | LOPUG |
| Lotus unifoliolatus var. unifoliolatus | Lotus sericeus Pursh, non Moench | LOSE4 |
| Lotus wrangelianus | Hosackia subpinnata auct. non (Lag.) Torr. & Gray [misapplied] | HOSU3 |
| Lotus wrangelianus | Lotus subpinnatus auct. non Lag. [misapplied] | LOSU3 |
| Lotus wrightii | Hosackia wrightii Gray | HOWR2 |
| Louisiana vetch | Vicia ludoviciana Nutt. | VILU |
| Louisiana vetch | Vicia ludoviciana Nutt. ssp. ludoviciana | VILUL2 |
| low prairie clover | Dalea scandens (P. Mill.) Clausen | DASC3 |
| low prairie clover | Dalea scandens (P. Mill.) Clausen var. paucifolia (Coult.) Barneby | DASCP |
| low rattlebox | Crotalaria pumila Ortega | CRPU4 |
| Lugard's clover | Trifolium lugardii Bullock | TRLU5 |
| Lumholtz's prairie clover | Dalea lumholtzii B.L. Robins. & Fern. | DALU |
| lupine | Lupinus L. | LUPIN |
| lupine clover | Trifolium lupinaster L. | TRLU |
| Lupinus ?alpestris | Lupinus acclivatatis C.P. Sm. | LUAC3 |
| Lupinus ?alpestris | Lupinus adscendens Rydb. | LUAD4 |
| Lupinus ?alpestris | Lupinus alexanderae C.P. Sm. | LUAL20 |
| Lupinus ?alpestris | Lupinus aliesicola C.P. Sm. | LUAL19 |
| Lupinus ?alpestris | Lupinus annieae C.P. Sm. | LUAN6 |
| Lupinus ?alpestris | Lupinus argenteus Pursh var. aristovatus C.P. Sm. | LUARA13 |
| Lupinus ?alpestris | Lupinus argenteus Pursh var. krauchianus C.P. Sm. | LUARK |
| Lupinus ?alpestris | Lupinus argenteus Pursh var. macounii (Rydb.) R.J. Davis | LUARM6 |
| Lupinus ?alpestris | Lupinus argenteus Pursh var. prati-harti C.P. Sm. | LUARP2 |
| Lupinus ?alpestris | Lupinus argenteus Pursh var. submanens C.P. Sm. | LUARS8 |
| Lupinus ?alpestris | Lupinus argenteus Pursh var. wallianus C.P. Sm. | LUARW2 |
| Lupinus ?alpestris | Lupinus calcicola C.P. Sm. | LUCA19 |
| Lupinus ?alpestris | Lupinus capitisamniculi C.P. Sm. | LUCA18 |
| Lupinus ?alpestris | Lupinus clokeyanus C.P. Sm. | LUCL2 |
| Lupinus ?alpestris | Lupinus flavopinum C.P. Sm. | LUFL7 |
| Lupinus ?alpestris | Lupinus junipericola C.P. Sm. | LUJU |
| Lupinus ?alpestris | Lupinus lariversianus C.P. Sm. | LULA8 |
| Lupinus ?alpestris | Lupinus laxus Rydb. | LULA10 |
| Lupinus ?alpestris | Lupinus macounii Rydb. | LUMA5 |
| Lupinus ?alpestris | Lupinus patulipes C.P. Sm. | LUPA9 |
| Lupinus ?alpestris | Lupinus populorum C.P. Sm. | LUPO4 |
| Lupinus ?alpestris | Lupinus pulcherrimus Rydb. | LUPU3 |
| Lupinus ?alpestris | Lupinus siccosilvae C.P. Sm. | LUSI4 |
| Lupinus ?alpestris | Lupinus trainianus C.P. Sm. | LUTR3 |
| Lupinus ?inyoensis | Lupinus inyoensis Heller var. demissus C.P. Sm. | LUIND |
| Lupinus ?inyoensis | Lupinus inyoensis Heller var. eriocalyx C.P. Sm. | LUINE |
| Lupinus abramsii | Lupinus albicaulis Dougl. var. abramsii (C.P. Sm.) Hoover | LUALA4 |
| Lupinus abramsii | Lupinus albifrons Benth. ex Lindl. var. abramsii (C.P. Sm.) Hoover | LUALA5 |
| Lupinus adsurgens var. adsurgens | Lupinus debilis Eastw. | LUDE8 |
| Lupinus adsurgens var. adsurgens | Lupinus pendletonii Heller | LUPE8 |
| Lupinus adsurgens var. lilacinus | Lupinus alcis-montis C.P. Sm. | LUAL18 |
| Lupinus adsurgens var. lilacinus | Lupinus aliceae C.P. Sm. | LUAL21 |
| Lupinus adsurgens var. lilacinus | Lupinus brandegeei Eastw. | LUBR9 |
| Lupinus adsurgens var. lilacinus | Lupinus lilacinus (Heller ex C.P. Sm.) Heller | LULI4 |
| Lupinus adsurgens var. undulatus | Lupinus klamathensis Eastw. | LUKL |
| Lupinus adsurgens var. undulatus | Lupinus nemoralis Greene | LUNE3 |
| Lupinus affinis | Lupinus nanus Dougl. ex Benth. var. carnosulus (Greene) C.P. Sm. | LUNAC |
| Lupinus agardhianus | Lupinus concinnus J.G. Agardh var. agardhianus (Heller) C.P. Sm. | LUCOA2 |
| Lupinus agardhianus | Lupinus gracilis J.G. Agardh, non Nutt. | LUGR4 |
| Lupinus albicaulis var. albicaulis | Lupinus falcifer Nutt. ex Torr. & Gray (pro syn.) | LUFA5 |
| Lupinus albicaulis var. albicaulis | Lupinus quercetorum Heller | LUQU |
| Lupinus albicaulis var. albicaulis | Lupinus wolfianus C.P. Sm. | LUWO |
| Lupinus albicaulis var. shastensis | Lupinus shastensis Heller | LUSH2 |
| Lupinus albifrons var. douglasii | Lupinus douglasii J.G. Agardh var. fallax (Greene) J.T. Howell | LUDOF2 |
| Lupinus albifrons var. eminens | Lupinus albifrons Benth. ex Lindl. ssp. eminens (Greene) D. Dunn | LUALE2 |
| Lupinus albus | Lupinus termis Forssk. | LUTE7 |
| Lupinus ammophilus | Lupinus polyphyllus Lindl. var. ammophilus (Greene) Barneby | LUPOA |
| Lupinus andersonii | Lupinus rinae Eastw. | LURI2 |
| Lupinus angustiflorus | Lupinus andersonii S. Wats. var. christinae (Heller) Munz | LUANC |
| Lupinus angustiflorus | Lupinus christinae Heller | LUCH5 |
| Lupinus angustiflorus | Lupinus reticularis Desv. | LURE5 |
| Lupinus angustifolius | Lupinus linifolius Roth | LULI7 |
| Lupinus angustifolius | Lupinus reticulatus Desv. | LURE6 |
| Lupinus angustifolius | Lupinus varius L. | LUVA4 |
| Lupinus apertus | Lupinus andersonii S. Wats. var. apertus (Heller) C.P. Sm. | LUANA |
| Lupinus arbustus ssp. arbustus var. arbustus | Lupinus laxiflorus Dougl. ex Lindl. var. arbustus (Dougl. ex Lindl.) M.E. Jones | LULAA |
| Lupinus arbustus ssp. arbustus var. montanus | Lupinus laxiflorus Dougl. ex Lindl. var. cognatus C.P. Sm. | LULAC6 |
| Lupinus arbustus ssp. calcaratus | Lupinus arbustus Dougl. ex Lindl. var. calcaratus (Kellogg) Welsh | LUARC5 |
| Lupinus arbustus ssp. calcaratus | Lupinus calcaratus Kellogg | LUCA4 |
| Lupinus arbustus ssp. calcaratus | Lupinus laxiflorus Dougl. ex Lindl. var. calcaratus (Kellogg) C.P. Sm. | LULAC5 |
| Lupinus arbustus ssp. neolaxiflorus | Lupinus amniculi-putori C.P. Sm. | LUAM3 |
| Lupinus arbustus ssp. neolaxiflorus | Lupinus augustii C.P. Sm. | LUAU |
| Lupinus arbustus ssp. neolaxiflorus | Lupinus caudatus Kellogg var. submanens C.P. Sm. | LUCAS |
| Lupinus arbustus ssp. neolaxiflorus | Lupinus laxiflorus Dougl. ex Lindl. var. lyleanus C.P. Sm., non Lupinus lyleanus C.P. Sm. | LULAL4 |
| Lupinus arbustus ssp. neolaxiflorus | Lupinus lyleanus C.P. Sm. | LULY2 |
| Lupinus arbustus ssp. neolaxiflorus | Lupinus mackeyi C.P. Sm. | LUMA7 |
| Lupinus arbustus ssp. neolaxiflorus | Lupinus standingii C.P. Sm. | LUST10 |
| Lupinus arbustus ssp. neolaxiflorus | Lupinus stipaphilus C.P. Sm. | LUST3 |
| Lupinus arbustus ssp. neolaxiflorus | Lupinus stockii C.P. Sm. | LUST8 |
| Lupinus arbustus ssp. neolaxiflorus | Lupinus wenachensis Eastw. | LUWE2 |
| Lupinus arbustus ssp. neolaxiflorus | Lupinus yakimensis C.P. Sm. | LUYA |
| Lupinus arbustus ssp. pseudoparviflorus | Lupinus laxiflorus Dougl. ex Lindl. var. elmerianus C.P. Sm. | LULAE |
| Lupinus arbustus ssp. pseudoparviflorus | Lupinus laxiflorus Dougl. ex Lindl. var. pseudoparviflorus (Rydb.) C.P. Sm. & St. John | LULAP5 |
| Lupinus arbustus ssp. pseudoparviflorus | Lupinus laxispicatus Rydb. | LULA18 |
| Lupinus arbustus ssp. pseudoparviflorus | Lupinus laxispicatus Rydb. var. whithamii C.P. Sm. | LULAW |
| Lupinus arbustus ssp. pseudoparviflorus | Lupinus mucronulatus J.T. Howell var. umatillensis C.P. Sm. | LUMUU |
| Lupinus arbustus ssp. pseudoparviflorus | Lupinus scheuberae Rydb. | LUSC |
| Lupinus arbustus ssp. silvicola | Lupinus lassenensis Eastw. | LULA11 |
| Lupinus arbustus ssp. silvicola | Lupinus laxiflorus Dougl. ex Lindl. var. silvicola (Heller) C.P. Sm. | LULAS |
| Lupinus arcticus ssp. arcticus | Lupinus borealis Heller | LUBO2 |
| Lupinus arcticus ssp. arcticus | Lupinus donnellyensis C.P. Sm. | LUDO |
| Lupinus arcticus ssp. arcticus | Lupinus gakonensis C.P. Sm. | LUGA2 |
| Lupinus arcticus ssp. arcticus | Lupinus multicaulis C.P. Sm. | LUMU7 |
| Lupinus arcticus ssp. arcticus | Lupinus multifolius C.P. Sm. | LUMU3 |
| Lupinus arcticus ssp. arcticus | Lupinus nootkatensis Donn ex Sims var. kiellmannii Ostenf. | LUNOK |
| Lupinus arcticus ssp. arcticus | Lupinus polyphyllus Lindl. ssp. arcticus (S. Wats.) L. Phillips | LUPOA2 |
| Lupinus arcticus ssp. arcticus | Lupinus relictus Hult | LURE3 |
| Lupinus arcticus ssp. arcticus | Lupinus yukonensis Greene | LUYU |
| Lupinus arcticus ssp. subalpinus | Lupinus arcticus S. Wats. var. subalpinus (Piper & B.L. Robins.) C.P. Sm. | LUARS6 |
| Lupinus arcticus ssp. subalpinus | Lupinus glacialis C.P. Sm. | LUGL3 |
| Lupinus arcticus ssp. subalpinus | Lupinus latifolius Lindl. ex J.G. Agardh var. subalpinus (Piper & B.L. Robins.) C.P. Sm. | LULAS2 |
| Lupinus arcticus ssp. subalpinus | Lupinus subalpinus Piper & B.L. Robins. | LUSU16 |
| Lupinus arcticus ssp. subalpinus | Lupinus volcanicus Greene | LUVO3 |
| Lupinus arcticus ssp. subalpinus | Lupinus volcanicus Greene var. rupestricola C.P. Sm. | LUVOR |
| Lupinus argenteus ssp. argenteus var. argenteus | Lupinus argenteus Pursh var. decumbens (Torr.) S. Wats. | LUARD |
| Lupinus argenteus ssp. argenteus var. argenteus | Lupinus corymbosus Heller | LUCO9 |
| Lupinus argenteus ssp. argenteus var. argenteus | Lupinus decumbens Torr. | LUDE10 |
| Lupinus argenteus ssp. argenteus var. argenteus | Lupinus foliosus (Torr. & Gray) Nutt. ex Hook. | LUFO3 |
| Lupinus argenteus ssp. argenteus var. argenteus | Lupinus garrettianus C.P. Sm. | LUGA4 |
| Lupinus argenteus ssp. argenteus var. argenteus | Lupinus laxiflorus Dougl. ex Lindl. var. corymbosus (Heller) Jepson | LULAC4 |
| Lupinus argenteus ssp. argenteus var. argenteus | Lupinus laxiflorus Dougl. ex Lindl. var. foliosus Torr. & Gray | LULAF |
| Lupinus argenteus ssp. argenteus var. argenteus | Lupinus sitgreavesii S. Wats. | LUSI |
| Lupinus argenteus ssp. argenteus var. laxiflorus | Lupinus argenteus Pursh var. stenophyllus (Rydb.) R.J. Davis | LUARS7 |
| Lupinus argenteus ssp. argenteus var. laxiflorus | Lupinus argenteus Pursh var. tenellus (Dougl. ex G. Don) D. Dunn | LUART |
| Lupinus argenteus ssp. argenteus var. laxiflorus | Lupinus cariciformes C.P. Sm. | LUCA7 |
| Lupinus argenteus ssp. argenteus var. laxiflorus | Lupinus charlestonensis C.P. Sm. | LUCH3 |
| Lupinus argenteus ssp. argenteus var. laxiflorus | Lupinus clarkensis C.P. Sm. | LUCL |
| Lupinus argenteus ssp. argenteus var. laxiflorus | Lupinus edward-palmeri C.P. Sm. | LUED |
| Lupinus argenteus ssp. argenteus var. laxiflorus | Lupinus foliosus (Torr. & Gray) Nutt. ex Hook. var. stenophyllus Nutt. ex Torr. & Gray (pro syn.) | LUFOS |
| Lupinus argenteus ssp. argenteus var. laxiflorus | Lupinus fremontensis C.P. Sm. | LUFR |
| Lupinus argenteus ssp. argenteus var. laxiflorus | Lupinus hullianus C.P. Sm. | LUHU3 |
| Lupinus argenteus ssp. argenteus var. laxiflorus | Lupinus lanatocarinatus C.P. Sm. | LULA14 |
| Lupinus argenteus ssp. argenteus var. laxiflorus | Lupinus laxiflorus Dougl. ex Lindl. var. tenellus Dougl. ex Torr. & Gray | LULAT |
| Lupinus argenteus ssp. argenteus var. laxiflorus | Lupinus laxiflorus Dougl. ex Lindl., non Amer. auct. | LULA3 |
| Lupinus argenteus ssp. argenteus var. laxiflorus | Lupinus montis-cookii C.P. Sm. | LUMO8 |
| Lupinus argenteus ssp. argenteus var. laxiflorus | Lupinus stenophyllus Rydb. | LUST7 |
| Lupinus argenteus ssp. argenteus var. laxiflorus | Lupinus tenellus Dougl. ex G. Don | LUTE3 |
| Lupinus argenteus ssp. ingratus | Lupinus ingratus Greene | LUIN4 |
| Lupinus argenteus ssp. moabensis | Lupinus argenteus Pursh var. moabensis (D. Dunn & Harmon) Welsh | LUARM2 |
| Lupinus argenteus ssp. rubricaulis | Lupinus argenteus Pursh var. rubricaulis (Greene) Welsh | LUARR2 |
| Lupinus argenteus ssp. rubricaulis | Lupinus caudatus Kellogg var. rubricaulis (Greene) C.P. Sm. | LUCAR |
| Lupinus argenteus ssp. rubricaulis | Lupinus rubricaulis Greene | LURU5 |
| Lupinus argenteus ssp. spathulatus | Lupinus alsophilus Greene | LUAL9 |
| Lupinus argenteus ssp. spathulatus | Lupinus argenteus Pursh var. argentatus (Rydb.) Barneby | LUARA15 |
| Lupinus argenteus ssp. spathulatus | Lupinus argenteus Pursh var. boreus (C.P. Sm.) Welsh | LUARB3 |
| Lupinus argenteus ssp. spathulatus | Lupinus spathulatus Rydb. | LUSP8 |
| Lupinus argenteus ssp. spathulatus | Lupinus spathulatus Rydb. var. boreus C.P. Sm. | LUSPB |
| Lupinus aridus ssp. aridus | Lupinus lepidus Dougl. ex Lindl. ssp. aridus (Dougl.) Detling | LULEA4 |
| Lupinus aridus ssp. aridus | Lupinus lepidus Dougl. ex Lindl. var. aridus (Dougl.) Jepson | LULEA3 |
| Lupinus aridus ssp. ashlandensis | Lupinus lepidus Dougl. ex Lindl. var. ashlandensis (Cox) Isely | LULEA5 |
| Lupinus aridus ssp. lenorensis | Lupinus lenorensis C.P. Sm. | LULE5 |
| Lupinus arizonicus ssp. arizonicus var. arizonicus | Lupinus concinnus J.G. Agardh var. arizonicus S. Wats. | LUCOA |
| Lupinus arizonicus ssp. arizonicus var. arizonicus | Lupinus sparsiflorus Benth. var. arizonicus (S. Wats.) C.P. Sm. | LUSPA |
| Lupinus arizonicus ssp. arizonicus var. arizonicus | Lupinus subhirsutus A. Davids. | LUSU15 |
| Lupinus arizonicus ssp. arizonicus var. barbatulus | Lupinus sparsiflorus Benth. var. barbatulus Thornb. ex C.P. Sm. | LUSPB3 |
| Lupinus arizonicus ssp. setosissimus | Lupinus sparsiflorus Benth. var. setosissimus C.P. Sm. | LUSPS3 |
| Lupinus bakeri ssp. amplus | Lupinus amplus Greene | LUAM6 |
| Lupinus bakeri ssp. amplus | Lupinus comatus Rydb. | LUCO11 |
| Lupinus bakeri ssp. amplus | Lupinus habrocomus Greene | LUHA4 |
| Lupinus bakeri ssp. bakeri | Lupinus arcenthinus Greene | LUAR10 |
| Lupinus bakeri ssp. bakeri | Lupinus dichrous Greene | LUDI3 |
| Lupinus barbiger | Lupinus sericeus Pursh var. barbiger (S. Wats.) Welsh | LUSEB2 |
| Lupinus benthamii var. benthamii | Lupinus leptophyllus Benth., non Schlecht. & Cham. | LULE7 |
| Lupinus bicolor ssp. bicolor | Lupinus hirsutulus Greene | LUHI5 |
| Lupinus bicolor ssp. bicolor | Lupinus micranthus Dougl. var. bicolor (Lindl.) S. Wats. | LUMIB |
| Lupinus bicolor ssp. bicolor | Lupinus strigulosus Gandog. | LUST5 |
| Lupinus bicolor ssp. microphyllus | Lupinus bicolor Lindl. var. microphyllus (S. Wats.) C.P. Sm. | LUBIM3 |
| Lupinus bicolor ssp. microphyllus | Lupinus micranthus Dougl. var. microphyllus S. Wats. | LUMIM |
| Lupinus bicolor ssp. pipersmithii | Lupinus bicolor Lindl. var. pipersmithii (Heller) C.P. Sm. | LUBIP2 |
| Lupinus bicolor ssp. pipersmithii | Lupinus pipersmithii Heller | LUPI3 |
| Lupinus bicolor ssp. tridentatus var. rostratus | Lupinus rostratus Eastw. | LURO2 |
| Lupinus bicolor ssp. tridentatus var. tridentatus | Lupinus bicolor Lindl. var. tetraspermus C.P. Sm. | LUBIT4 |
| Lupinus bicolor ssp. umbellatus var. trifidus | Lupinus micranthus Dougl. var. trifidus Torr. ex S. Wats. | LUMIT |
| Lupinus bicolor ssp. umbellatus var. trifidus | Lupinus trifidus Torr. ex S. Wats. | LUTR4 |
| Lupinus bicolor ssp. umbellatus var. umbellatus | Lupinus plebeius Greene ex C.F. Baker | LUPL2 |
| Lupinus bicolor ssp. umbellatus var. umbellatus | Lupinus sabulosus Heller | LUSA8 |
| Lupinus bicolor ssp. umbellatus var. umbellatus | Lupinus umbellatus Greene | LUUM |
| Lupinus bingenensis var. bingenensis | Lupinus bingenensis Suksdorf var. albus Suksdorf | LUBIA |
| Lupinus bingenensis var. bingenensis | Lupinus bingenensis Suksdorf var. roseus Suksdorf | LUBIR2 |
| Lupinus bingenensis var. bingenensis | Lupinus leucopsis J.G. Agardh var. bingenensis (Suksdorf) C.P. Sm. | LULEB3 |
| Lupinus bingenensis var. dubius | Lupinus leucopsis J.G. Agardh var. dubius (C.P. Sm.) C.P. Sm. | LULED |
| Lupinus bingenensis var. dubius | Lupinus leucopsis J.G. Agardh var. hendersonianus C.P. Sm. | LULEH |
| Lupinus bingenensis var. dubius | Lupinus leucopsis J.G. Agardh var. shermanensis C.P. Sm. | LULES |
| Lupinus bingenensis var. subsaccatus | Lupinus sulphureus Dougl. ex Hook. ssp. subsaccatus (Suksdorf) L. Phillips | LUSUS3 |
| Lupinus bingenensis var. subsaccatus | Lupinus sulphureus Dougl. ex Hook. var. subsaccatus (Suksdorf) C.L. Hitchc. | LUSUS4 |
| Lupinus brevicaulis | Lupinus dispersus Heller | LUDI5 |
| Lupinus brevicaulis | Lupinus scaposus Rydb. | LUSC2 |
| Lupinus brevior | Lupinus concinnus J.G. Agardh var. brevior (Jepson) D. Dunn | LUCOB |
| Lupinus brevior | Lupinus sparsiflorus Benth. var. brevior Jepson | LUSPB2 |
| Lupinus breweri var. bryoides | Lupinus tegeticulatus Eastw. | LUTE8 |
| Lupinus breweri var. grandiflorus | Lupinus breweri Gray var. clokeyanus C.P. Sm. | LUBRC |
| Lupinus breweri var. grandiflorus | Lupinus campbellae Eastw. | LUCA14 |
| Lupinus breweri var. grandiflorus | Lupinus campbellae Eastw. var. bernardianus Eastw. | LUCAB |
| Lupinus breweri var. grandiflorus | Lupinus tegeticulatus Eastw. var. grandiflorus (C.P. Sm.) Barneby | LUTEG |
| Lupinus burkei ssp. burkei | Lupinus polyphyllus Lindl. var. burkei (S. Wats.) C.L. Hitchc. | LUPOB3 |
| Lupinus caespitosus var. caespitosus | Lupinus lepidus Dougl. ex Lindl. ssp. caespitosus (Nutt.) Detling | LULEC3 |
| Lupinus caespitosus var. caespitosus | Lupinus marleanus C.P. Sm. | LUMA11 |
| Lupinus caespitosus var. utahensis | Lupinus amniculi-cervi C.P. Sm. | LUAM4 |
| Lupinus caespitosus var. utahensis | Lupinus aridus Dougl. var. utahensis S. Wats. | LUARU3 |
| Lupinus caespitosus var. utahensis | Lupinus lepidus Dougl. ex Lindl. var. utahensis (S. Wats.) C.L. Hitchc. | LULEU2 |
| Lupinus caespitosus var. utahensis | Lupinus psoralioides Pollard | LUPS |
| Lupinus caespitosus var. utahensis | Lupinus sinus-meyersi C.P. Sm. | LUSI6 |
| Lupinus caespitosus var. utahensis | Lupinus watsonii Heller | LUWA2 |
| Lupinus caudatus ssp. argophyllus | Lupinus aduncus Greene | LUAD3 |
| Lupinus caudatus ssp. argophyllus | Lupinus argophyllus (Gray) Cockerell | LUAR13 |
| Lupinus caudatus ssp. argophyllus | Lupinus caudatus Kellogg var. argophyllus (Gray) Welsh | LUCAA2 |
| Lupinus caudatus ssp. argophyllus | Lupinus decumbens Nutt. var. argophyllus Gray | LUDEA3 |
| Lupinus caudatus ssp. argophyllus | Lupinus helleri Greene | LUHE |
| Lupinus caudatus ssp. argophyllus | Lupinus laxiflorus Dougl. ex Lindl. var. argophyllus (Gray) M.E. Jones | LULAA2 |
| Lupinus caudatus ssp. caudatus | Lupinus argenteus Pursh var. heteranthus (S. Wats.) Barneby | LUARH4 |
| Lupinus caudatus ssp. caudatus | Lupinus argenteus Pursh var. utahensis (S. Wats.) Barneby | LUARU2 |
| Lupinus caudatus ssp. caudatus | Lupinus argentinus Rydb. | LUAR14 |
| Lupinus caudatus ssp. caudatus | Lupinus caudatus Kellogg var. subtenellus C.P. Sm. | LUCAS3 |
| Lupinus caudatus ssp. caudatus | Lupinus caudatus Kellogg var. utahensis (S. Wats.) Welsh | LUCAU2 |
| Lupinus caudatus ssp. caudatus | Lupinus gayophytophilus C.P. Sm. | LUGA3 |
| Lupinus caudatus ssp. caudatus | Lupinus holosericeus Nutt. var. utahensis S. Wats. | LUHOU |
| Lupinus caudatus ssp. caudatus | Lupinus lupinus Rydb. | LULU5 |
| Lupinus caudatus ssp. caudatus | Lupinus meionanthus Gray var. heteranthus S. Wats. | LUMEH |
| Lupinus caudatus ssp. caudatus | Lupinus montis-lieratatis C.P. Sm. | LUMO9 |
| Lupinus caudatus ssp. caudatus | Lupinus rosei Eastw. | LURO3 |
| Lupinus caudatus ssp. caudatus | Lupinus stinchfieldiae C.P. Sm. | LUST6 |
| Lupinus caudatus ssp. caudatus | Lupinus utahensis Moldenke p.p. | LUUT |
| Lupinus caudatus ssp. cutleri | Lupinus caudatus Kellogg var. cutleri (Eastw.) Welsh | LUCAC5 |
| Lupinus caudatus ssp. cutleri | Lupinus cutleri Eastw. | LUCU5 |
| Lupinus caudatus ssp. montigenus | Lupinus argenteus Pursh var. montigenus (Heller) Barneby | LUARM7 |
| Lupinus caudatus ssp. montigenus | Lupinus montigenus Heller | LUMO6 |
| Lupinus citrinus var. deflexus | Lupinus deflexus Congd. | LUDE7 |
| Lupinus concinnus ssp. optatus | Lupinus concinnus J.G. Agardh var. optatus C.P. Sm. | LUCOO3 |
| Lupinus concinnus ssp. orcuttii | Lupinus concinnus J.G. Agardh var. orcuttii (S. Wats.) C.P. Sm. | LUCOO4 |
| Lupinus concinnus ssp. orcuttii | Lupinus micensis M.E. Jones | LUMI10 |
| Lupinus concinnus ssp. orcuttii | Lupinus orcuttii S. Wats. | LUOR3 |
| Lupinus confertus | Lupinus aridus Dougl. var. confertus (Kellogg) C.P. Sm. | LUARC3 |
| Lupinus confertus | Lupinus confertus Kellogg var. ramosus (Jepson) Eastw. | LUCOR |
| Lupinus confertus | Lupinus lepidus Dougl. ex Lindl. ssp. confertus (Kellogg) Detling | LULEC4 |
| Lupinus confertus | Lupinus lepidus Dougl. ex Lindl. var. confertus (Kellogg) C.P. Sm. | LULEC6 |
| Lupinus confertus | Lupinus lepidus Dougl. ex Lindl. var. ramosus Jepson | LULER |
| Lupinus congdonii | Lupinus micranthus Dougl. var. congdonii C.P. Sm. | LUMIC |
| Lupinus constancei | Lupinus lepidus Dougl. ex Lindl. var. constancei (T.W. & J.P. Nelson) Isely | LULEC10 |
| Lupinus covillei | Lupinus dasyphyllus Greene | LUDA2 |
| Lupinus crassus | Lupinus ammophilus Greene var. crassus (Payson) Isely | LUAMC |
| Lupinus croceus var. pilosellus | Lupinus pilosellus Eastw. | LUPI5 |
| Lupinus culbertsonii ssp. culbertsonii | Lupinus lepidus Dougl. ex Lindl. var. culbertsonii (Greene) C.P. Sm. | LULEC5 |
| Lupinus culbertsonii ssp. hypolasius | Lupinus brunneomaculatus Eastw. | LUBR5 |
| Lupinus culbertsonii ssp. hypolasius | Lupinus crassulus Greene ex C.F. Baker | LUCR3 |
| Lupinus culbertsonii ssp. hypolasius | Lupinus hypolasius Greene | LUHY4 |
| Lupinus cusickii ssp. abortivus | Lupinus abortivus Greene | LUAB2 |
| Lupinus cusickii ssp. abortivus | Lupinus aridus Dougl. var. abortivus (Greene) C.P. Sm. | LUARA14 |
| Lupinus cusickii ssp. brachypodus | Lupinus brachypodus Piper | LUBR7 |
| Lupinus cusickii ssp. cusickii | Lupinus aridus Dougl. var. cusickii (S. Wats.) C.P. Sm. | LUARC4 |
| Lupinus cusickii ssp. cusickii | Lupinus lepidus Dougl. ex Lindl. ssp. cusickii (S. Wats.) Detling | LULEC8 |
| Lupinus cusickii ssp. cusickii | Lupinus lepidus Dougl. ex Lindl. var. cusickii (S. Wats.) C.L. Hitchc. | LULEC7 |
| Lupinus cusickii ssp. cusickii | Lupinus longivallis C.P. Sm. | LULO3 |
| Lupinus dalesiae | Lupinus formosus Greene var. clemensiae C.P. Sm. | LUFOC |
| Lupinus densiflorus var. aureus | Lupinus densiflorus Benth. var. menziesii (J.G. Agardh) C.P. Sm. | LUDEM |
| Lupinus densiflorus var. aureus | Lupinus densiflorus Benth. var. perfistulosus C.P. Sm. | LUDEP2 |
| Lupinus densiflorus var. aureus | Lupinus menziesii J.G. Agardh | LUME2 |
| Lupinus densiflorus var. austrocollium | Lupinus densiflorus Benth. ssp. austrocollium (C.P. Sm.) D. Dunn | LUDEA4 |
| Lupinus densiflorus var. densiflorus | Lupinus densiflorus Benth. var. latilabris C.P. Sm. | LUDEL2 |
| Lupinus densiflorus var. densiflorus | Lupinus densiflorus Benth. var. scopulorum C.P. Sm. | LUDES |
| Lupinus densiflorus var. densiflorus | Lupinus densiflorus Benth. var. stenopetalus C.P. Sm. | LUDES4 |
| Lupinus densiflorus var. densiflorus | Lupinus densiflorus Benth. var. tracyi C.P. Sm. | LUDET |
| Lupinus densiflorus var. densiflorus | Lupinus microcarpus Sims ssp. scopulorum (C.P. Sm.) C.P. Sm. | LUMIS |
| Lupinus densiflorus var. densiflorus | Lupinus microcarpus Sims var. densiflorus (Benth.) Jepson | LUMID3 |
| Lupinus densiflorus var. glareosus | Lupinus glareosus Elmer | LUGL4 |
| Lupinus densiflorus var. lacteus | Lupinus arenicola Heller | LUAR12 |
| Lupinus densiflorus var. lacteus | Lupinus densiflorus Benth. ssp. lacteus (Kellogg) Beauchamp | LUDEL4 |
| Lupinus densiflorus var. lacteus | Lupinus densiflorus Benth. var. altus C.P. Sm. | LUDEA5 |
| Lupinus densiflorus var. lacteus | Lupinus densiflorus Benth. var. dudleyi C.P. Sm. | LUDED2 |
| Lupinus densiflorus var. lacteus | Lupinus densiflorus Benth. var. latidens C.P. Sm. | LUDEL3 |
| Lupinus densiflorus var. lacteus | Lupinus densiflorus Benth. var. mcgregorii C.P. Sm. | LUDEM2 |
| Lupinus densiflorus var. lacteus | Lupinus densiflorus Benth. var. persecundus C.P. Sm. | LUDEP3 |
| Lupinus densiflorus var. lacteus | Lupinus densiflorus Benth. var. sublanatus C.P. Sm. | LUDES2 |
| Lupinus densiflorus var. lacteus | Lupinus densiflorus Benth. var. vastiticola C.P. Sm. | LUDEV |
| Lupinus densiflorus var. lacteus | Lupinus densiflorus Benth. var. versatabilis C.P. Sm. | LUDEV2 |
| Lupinus densiflorus var. palustris | Lupinus densiflorus Benth. var. crinitus Eastw. ex C.P. Sm. | LUDEC |
| Lupinus densiflorus var. palustris | Lupinus densiflorus Benth. var. curvicarinus C.P. Sm. | LUDEC2 |
| Lupinus densiflorus var. palustris | Lupinus densiflorus Benth. var. stanfordianus C.P. Sm. | LUDES3 |
| Lupinus densiflorus var. palustris | Lupinus densiflorus Benth. var. trichocalyx C.P. Sm. | LUDET2 |
| Lupinus depressus | Lupinus argenteus Pursh var. depressus (Rydb.) C.L. Hitchc. | LUARD2 |
| Lupinus diffusus | Lupinus villosus Willd. ssp. diffusus (Nutt.) L. Phillips | LUVID |
| Lupinus diffusus | Lupinus villosus Willd. var. diffusus (Nutt.) Torr. & Gray | LUVID2 |
| Lupinus duranii | Lupinus tegeticulatus Eastw. var. duranii (Eastw.) Barneby | LUTED |
| Lupinus elatus | Lupinus albicaulis Dougl. var. elatus (I.M. Johnston) Jepson | LUALE3 |
| Lupinus elatus | Lupinus formosus Greene var. elatus (I.M. Johnston) C.P. Sm. | LUFOE |
| Lupinus elmeri | Lupinus albicaulis Dougl. var. sylvestris (E. Drew) Greene | LUALS2 |
| Lupinus elmeri | Lupinus sylvestris E. Drew, non Lam. | LUSY |
| Lupinus evermannii | Lupinus sparhawkianus C.P. Sm. | LUSP9 |
| Lupinus excubitus var. austromontanus | Lupinus austromontanus Heller | LUAU2 |
| Lupinus excubitus var. austromontanus | Lupinus excubitus M.E. Jones ssp. austromontanus (Heller) Beauchamp | LUEXA2 |
| Lupinus excubitus var. hallii | Lupinus excubitus M.E. Jones ssp. hallii (Abrams) D. Dunn | LUEXH2 |
| Lupinus excubitus var. hallii | Lupinus hallii Abrams | LUHA5 |
| Lupinus excubitus var. hallii | Lupinus paynei A. Davids. | LUPA11 |
| Lupinus excubitus var. medius | Lupinus albifrons Benth. ex Lindl. var. medius Jepson | LUALM |
| Lupinus excubitus var. medius | Lupinus excubitus M.E. Jones ssp. medius (Jepson) Beauchamp | LUEXM2 |
| Lupinus excubitus var. medius | Lupinus grayi (S. Wats.) S. Wats. var. medius (Jepson) C.P. Sm. | LUGRM |
| Lupinus eximius | Lupinus arboreus Sims var. eximius (Burtt-Davy) C.P. Sm. | LUARE |
| Lupinus fissicalyx | Lupinus albifrons Benth. ex Lindl. var. fissicalyx (Heller) C.P. Sm. | LUALF2 |
| Lupinus flavoculatus | Lupinus rubens Rydb. var. flavoculatus (Heller) C.P. Sm. | LURUF |
| Lupinus formosus var. formosus | Lupinus lutosus Heller | LULU6 |
| Lupinus formosus var. robustus | Lupinus albipilosus Heller | LUAL15 |
| Lupinus formosus var. robustus | Lupinus bridgesii (S. Wats.) Heller | LUBR6 |
| Lupinus formosus var. robustus | Lupinus caeruleus Heller | LUCA8 |
| Lupinus formosus var. robustus | Lupinus formosus Greene var. bridgesii (S. Wats.) Greene | LUFOB |
| Lupinus formosus var. robustus | Lupinus formosus Greene var. sonomensis (Heller) Conrad | LUFOS3 |
| Lupinus formosus var. robustus | Lupinus greenei Heller, non A. Nels. | LUGR5 |
| Lupinus formosus var. robustus | Lupinus navaliformis Heller | LUNA |
| Lupinus formosus var. robustus | Lupinus navicularis Heller | LUNA6 |
| Lupinus garfieldensis | Lupinus sericeus Pursh ssp. asotinensis L. Phillips | LUSEA3 |
| Lupinus garfieldensis | Lupinus sericeus Pursh var. asotinensis (L. Phillips) C.L. Hitchc. | LUSEA4 |
| Lupinus gormanii | Lupinus pumicola Heller | LUPU5 |
| Lupinus grayi | Lupinus andersonii S. Wats. var. grayi S. Wats. | LUANG |
| Lupinus grayi | Lupinus falsoformis C.P. Sm. | LUFA |
| Lupinus grayi | Lupinus falsograyi C.P. Sm. | LUFA4 |
| Lupinus grayi | Lupinus ione-grisetae C.P. Sm. | LUIO |
| Lupinus grayi | Lupinus louise-bucariae C.P. Sm. | LULO6 |
| Lupinus guadalupensis | Lupinus aliclementinus C.P. Sm. | LUAL10 |
| Lupinus guadalupensis | Lupinus moranii Dunkle | LUMO7 |
| Lupinus hillii var. arizonicus | Lupinus ingratus Greene var. arizonicus C.P. Sm. | LUINA2 |
| Lupinus hillii var. hillii | Lupinus argenteus Pursh var. hillii (Greene) Barneby | LUARH |
| Lupinus hillii var. hillii | Lupinus marcusianus C.P. Sm. | LUMA13 |
| Lupinus hillii var. osterhoutianus | Lupinus osterhoutianus C.P. Sm. | LUOS2 |
| Lupinus holosericeus | Lupinus argenteus Pursh var. holosericeus (Nutt.) Barneby | LUARH3 |
| Lupinus holosericeus | Lupinus lacuum-trinitatum C.P. Sm. | LULA9 |
| Lupinus holosericeus | Lupinus minearanus C.P. Sm. | LUMI8 |
| Lupinus holosericeus | Lupinus multicincinnus C.P. Sm. | LUMU5 |
| Lupinus holosericeus | Lupinus summae C.P. Sm. | LUSU12 |
| Lupinus horizontalis var. horizontalis | Lupinus microcarpus Sims var. horizontalis (Heller) Jepson | LUMIH4 |
| Lupinus huachucanus | Lupinus platanophilus M.E. Jones | LUPL3 |
| Lupinus hyacinthinus | Lupinus albicaulis Dougl. var. hyacinthinus (Greene) Jepson | LUALH |
| Lupinus hyacinthinus | Lupinus formosus Greene var. hyacinthinus (Greene) C.P. Sm. | LUFOH |
| Lupinus jonesii | Lupinus sericeus Pursh var. jonesii (Rydb.) Welsh | LUSEJ |
| Lupinus kingii var. kingii | Lupinus capitatus Greene | LUCA13 |
| Lupinus kingii var. kingii | Lupinus sileri S. Wats. | LUSI5 |
| Lupinus kuschei | Lupinus sericeus Pursh var. kuschei (Eastw.) Boivin | LUSEK |
| Lupinus latifolius | Lupinus latifolius J. Agardh var. latifolius J. Agardh [superfluous autonym] | LULAL8 |
| Lupinus latifolius ssp. dudleyi | Lupinus dudleyi (Rydb.) Eastw. | LUDU2 |
| Lupinus latifolius ssp. dudleyi | Lupinus latifolius Lindl. ex J.G. Agardh var. dudleyi (Rydb.) C.P. Sm. & St. John | LULAD2 |
| Lupinus latifolius ssp. latifolius | Lupinus caudiciferus Eastw. | LUCA10 |
| Lupinus latifolius ssp. latifolius | Lupinus columbianus Heller | LUCO10 |
| Lupinus latifolius ssp. latifolius | Lupinus confusus Heller, non Rose | LUCO12 |
| Lupinus latifolius ssp. latifolius | Lupinus cytisoides J.G. Agardh | LUCY3 |
| Lupinus latifolius ssp. latifolius | Lupinus lasiotropis Greene ex Eastw. | LULA16 |
| Lupinus latifolius ssp. latifolius | Lupinus latifolius Lindl. ex J.G. Agardh var. columbianus (Heller) C.P. Sm. | LULAC2 |
| Lupinus latifolius ssp. latifolius | Lupinus latifolius Lindl. ex J.G. Agardh var. ligulatus (Greene) C.P. Sm. | LULAL5 |
| Lupinus latifolius ssp. latifolius | Lupinus ligulatus Greene | LULI6 |
| Lupinus latifolius ssp. latifolius | Lupinus perennis L. ssp. latifolius (Lindl. ex J.G. Agardh) L. Phillips | LUPEL |
| Lupinus latifolius ssp. latifolius | Lupinus rivularis Dougl. ex Lindl. var. latifolius (Lindl. ex J.G. Agardh) Jepson | LURIL |
| Lupinus latifolius ssp. leucanthus | Lupinus latifolius Lindl. ex J.G. Agardh var. parishii auct. non C.P. Sm. [misapplied] | LULAP4 |
| Lupinus latifolius ssp. leucanthus | Lupinus leucanthus Rydb. | LULE9 |
| Lupinus latifolius ssp. longipes | Lupinus columbianus Heller var. simplex C.P. Sm. | LUCOS |
| Lupinus latifolius ssp. longipes | Lupinus edwin-livingstonii C.P. Sm. | LUED2 |
| Lupinus latifolius ssp. longipes | Lupinus latifolius Lindl. ex J.G. Agardh var. simplex (C.P. Sm.) Isely | LULAS3 |
| Lupinus latifolius ssp. longipes | Lupinus longipes Greene | LULO4 |
| Lupinus latifolius ssp. longipes | Lupinus pennellianus Heller ex Eastw. | LUPE11 |
| Lupinus latifolius ssp. longipes | Lupinus wyethii S. Wats. var. hansenii C.P. Sm. | LUWYH |
| Lupinus latifolius ssp. parishii | Lupinus latifolius Lindl. ex J.G. Agardh var. parishii C.P. Sm. | LULAP3 |
| Lupinus latifolius ssp. parishii | Lupinus parishii (C.P. Sm.) Eastw. | LUPA10 |
| Lupinus latifolius ssp. viridifolius var. barbatus | Lupinus barbatus (Henderson) Heller | LUBA6 |
| Lupinus latifolius ssp. viridifolius var. barbatus | Lupinus ligulatus Greene var. barbatus Henderson | LULIB |
| Lupinus latifolius ssp. viridifolius var. barbatus | Lupinus rivularis Dougl. ex Lindl. var. barbatus (Henderson) C.P. Sm. | LURIB |
| Lupinus latifolius ssp. viridifolius var. viridifolius | Lupinus rivularis Dougl. ex Lindl. var. viridifolius (Heller) Jepson | LURIV |
| Lupinus latifolius ssp. viridifolius var. viridifolius | Lupinus viridifolius Heller | LUVI3 |
| Lupinus latifolius ssp. wigginsii | Lupinus latifolius Lindl. ex J.G. Agardh var. wigginsii C.P. Sm. [excluded] | LULAW3 |
| Lupinus lemmonii | Lupinus argenteus Pursh var. lemmonii (C.P. Sm.) Isely | LUARL7 |
| Lupinus leucophyllus ssp. erectus | Lupinus erectus Henderson | LUER2 |
| Lupinus leucophyllus ssp. erectus | Lupinus leucophyllus Dougl. ex Lindl. var. tenuispicus (A. Nels.) C.P. Sm. | LULET |
| Lupinus leucophyllus ssp. erectus | Lupinus tenuispicus A. Nels. | LUTE5 |
| Lupinus leucophyllus ssp. leucophyllus var. canescens | Lupinus canescens T.J. Howell | LUCA9 |
| Lupinus leucophyllus ssp. leucophyllus var. leucophyllus | Lupinus cyaneus Rydb. | LUCY4 |
| Lupinus leucophyllus ssp. leucophyllus var. leucophyllus | Lupinus enodatus C.P. Sm. | LUEN |
| Lupinus leucophyllus ssp. leucophyllus var. leucophyllus | Lupinus forslingii C.P. Sm. | LUFO4 |
| Lupinus leucophyllus ssp. leucophyllus var. leucophyllus | Lupinus holosericeus Nutt. var. amblyophyllus B.L. Robins. | LUHOA |
| Lupinus leucophyllus ssp. leucophyllus var. leucophyllus | Lupinus leucophyllus Dougl. ex Lindl. var. plumosus (Dougl. ex Lindl.) B.L. Robins. | LULEP |
| Lupinus leucophyllus ssp. leucophyllus var. leucophyllus | Lupinus leucophyllus Dougl. ex Lindl. var. retrorsus (Henderson) C.P. Sm. | LULER2 |
| Lupinus leucophyllus ssp. leucophyllus var. leucophyllus | Lupinus macrostachys Rydb., non Rusby | LUMA6 |
| Lupinus leucophyllus ssp. leucophyllus var. leucophyllus | Lupinus plumosus Dougl. ex Lindl. | LUPL4 |
| Lupinus leucophyllus ssp. leucophyllus var. leucophyllus | Lupinus retrorsus Henderson | LURE4 |
| Lupinus longifolius | Lupinus albifrons Benth. ex Lindl. var. longifolius (S. Wats.) Isely | LUALL2 |
| Lupinus longifolius | Lupinus chamissonis Eschsch. var. longifolius S. Wats. | LUCHL |
| Lupinus longifolius | Lupinus mollisifolius A. Davids. | LUMO5 |
| Lupinus luteolus | Lupinus milo-bakeri C.P. Sm. | LUMI11 |
| Lupinus lyallii ssp. alcis-temporis | Lupinus alcis-temporis C.P. Sm. | LUAL13 |
| Lupinus lyallii ssp. lyallii var. danaus | Lupinus danaus Gray | LUDA3 |
| Lupinus lyallii ssp. lyallii var. danaus | Lupinus danaus Gray var. bicolor Eastw. | LUDAB |
| Lupinus lyallii ssp. lyallii var. fruticulosus | Lupinus fruticulosus Greene | LUFR2 |
| Lupinus lyallii ssp. lyallii var. fruticulosus | Lupinus perditorum Greene | LUPE9 |
| Lupinus lyallii ssp. minutifolius | Lupinus minutifolius Eastw. | LUMI6 |
| Lupinus lyallii ssp. washoensis | Lupinus aridus Dougl. var. washoensis (Heller) C.P. Sm. | LUARW |
| Lupinus lyallii ssp. washoensis | Lupinus washoensis Heller | LUWA3 |
| Lupinus magnificus var. glarecola | Lupinus kerrii Eastw. | LUKE |
| Lupinus magnificus var. hesperius | Lupinus hesperius Heller | LUHE2 |
| Lupinus meionanthus | Lupinus argenteus Pursh var. meionanthus (Gray) Barneby | LUARM5 |
| Lupinus minimus | Lupinus ovinus Greene | LUOV |
| Lupinus minimus | Lupinus piperi B.L. Robins. | LUPI6 |
| Lupinus mollis | Lupinus leucopsis J.G. Agardh var. mollis (Heller) C.P. Sm. | LULEM |
| Lupinus nanus ssp. latifolius | Lupinus nanus Dougl. ex Benth. var. latifolius Benth. ex Torr. | LUNAL2 |
| Lupinus nanus ssp. menkerae | Lupinus nanus Dougl. ex Benth. var. menkerae C.P. Sm. | LUNAM2 |
| Lupinus nanus ssp. nanus | Lupinus nanus Dougl. ex Benth. var. maritimus Hoover | LUNAM3 |
| Lupinus neomexicanus | Lupinus blumeri Greene | LUBL4 |
| Lupinus nootkatensis var. fruticosus | Lupinus arboreus Sims var. fruticosus (Sims) S. Wats. | LUARF |
| Lupinus nootkatensis var. fruticosus | Lupinus nootkatensis Donn ex Sims var. glaber Hook. | LUNOG |
| Lupinus nootkatensis var. fruticosus | Lupinus nootkatensis Donn ex Sims var. unalaskensis S. Wats. | LUNOU |
| Lupinus nootkatensis var. nootkatensis | Lupinus albertensis C.P. Sm. | LUAL11 |
| Lupinus nootkatensis var. nootkatensis | Lupinus kiskensis C.P. Sm. | LUKI2 |
| Lupinus nootkatensis var. nootkatensis | Lupinus nootkatensis Donn ex Sims var. ethel-looffii C.P. Sm. | LUNOE |
| Lupinus nootkatensis var. nootkatensis | Lupinus nootkatensis Donn ex Sims var. henry-looffii C.P. Sm. | LUNOH |
| Lupinus nootkatensis var. nootkatensis | Lupinus nootkatensis Donn ex Sims var. perlanatus C.P. Sm. | LUNOP |
| Lupinus nootkatensis var. nootkatensis | Lupinus perennis L. ssp. nootkatensis (Donn ex Sims) L. Phillips | LUPEN |
| Lupinus nootkatensis var. nootkatensis | Lupinus trifurcatus C.P. Sm. | LUTR5 |
| Lupinus obtusilobus | Lupinus ornatus Dougl. ex Lindl. var. obtusilobus (Heller) C.P. Sm. | LUORO2 |
| Lupinus onustus | Lupinus mucronulatus T.J. Howell | LUMU4 |
| Lupinus onustus | Lupinus oreganus Heller var. pusillulus C.P. Sm. | LUORP |
| Lupinus onustus | Lupinus pinetorum M.E. Jones, non Heller | LUPI7 |
| Lupinus onustus | Lupinus sulphureus Dougl. ex Hook. ssp. delnortensis (Eastw.) L. Phillips | LUSUD |
| Lupinus onustus | Lupinus thompsonianus C.P. Sm. | LUTH |
| Lupinus onustus | Lupinus violaceus Heller | LUVI4 |
| Lupinus onustus | Lupinus violaceus Heller var. delnortensis Eastw. | LUVID3 |
| Lupinus onustus | Lupinus violaceus Heller var. shastensis Eastw. | LUVIS |
| Lupinus oreganus var. kincaidii | Lupinus sulphureus Dougl. ex Hook. ssp. kincaidii (C.P. Sm.) L. Phillips | LUSUK |
| Lupinus oreganus var. kincaidii | Lupinus sulphureus Dougl. ex Hook. var. kincaidii (C.P. Sm.) C.L. Hitchc. | LUSUK2 |
| Lupinus oreganus var. oreganus | Lupinus amabilis Heller | LUAM7 |
| Lupinus oreganus var. oreganus | Lupinus biddlei Henderson ex C.P. Sm. | LUBI4 |
| Lupinus ornatus | Lupinus hellerae Heller | LUHE4 |
| Lupinus ornatus | Lupinus minimus Dougl. ex Hook. var. hellerae (Heller) C.P. Sm. | LUMIH |
| Lupinus pachylobus | Lupinus micranthus Dougl. var. pachylobus (Greene) Jepson | LUMIP |
| Lupinus padre-crowleyi | Lupinus dedeckerae Munz & D. Dunn | LUDE5 |
| Lupinus pallidus | Lupinus concinnus J.G. Agardh var. desertorum (Heller) C.P. Sm. | LUCOD |
| Lupinus pallidus | Lupinus concinnus J.G. Agardh var. pallidus (Brandeg.) C.P. Sm. | LUCOP |
| Lupinus pallidus | Lupinus desertorum Heller | LUDE6 |
| Lupinus palmeri | Lupinus argenteus Pursh var. palmeri (S. Wats.) Barneby | LUARP3 |
| Lupinus parviflorus ssp. floribundus | Lupinus floribundus Greene | LUFL3 |
| Lupinus parviflorus ssp. myrianthus var. fulvomaculatus | Lupinus argenteus Pursh var. fulvomaculatus (Payson) Barneby | LUARF2 |
| Lupinus parviflorus ssp. myrianthus var. fulvomaculatus | Lupinus fulvomaculatus Payson | LUFU2 |
| Lupinus parviflorus ssp. myrianthus var. myrianthus | Lupinus argenteus Pursh var. myrianthus (Greene) Isely | LUARM8 |
| Lupinus parviflorus ssp. myrianthus var. myrianthus | Lupinus leptostachys Greene | LULE6 |
| Lupinus parviflorus ssp. myrianthus var. myrianthus | Lupinus myrianthus Greene | LUMY |
| Lupinus parviflorus ssp. parviflorus | Lupinus allimicranthus C.P. Sm. | LUAL16 |
| Lupinus parviflorus ssp. parviflorus | Lupinus argenteus Pursh ssp. parviflorus (Nutt. ex Hook. & Arn.) L. Phillips | LUARP5 |
| Lupinus parviflorus ssp. parviflorus | Lupinus argenteus Pursh var. parviflorus (Nutt. ex Hook. & Arn.) C.L. Hitchc. | LUARP4 |
| Lupinus perennis ssp. gracilis | Lupinus gracilis Nutt., non J.G. Agardh | LUGR6 |
| Lupinus perennis ssp. gracilis | Lupinus nuttallii S. Wats. | LUNU2 |
| Lupinus perennis ssp. gracilis | Lupinus perennis L. var. gracilis (Nutt.) Chapman | LUPEG3 |
| Lupinus plattensis | Lupinus glabratus (S. Wats.) Rydb. | LUGL5 |
| Lupinus plattensis | Lupinus ornatus Dougl. ex Lindl. var. glabratus S. Wats. | LUORG |
| Lupinus polycarpus | Lupinus micranthus Dougl., non Guss. | LUMI7 |
| Lupinus polyphyllus | Lupinus polyphyllus Lindl. var. albiflorus Lindl. | LUPOA3 |
| Lupinus polyphyllus ssp. bernardianus | Lupinus bernardianus Abrams ex Eastw. | LUBE2 |
| Lupinus polyphyllus ssp. bernardianus | Lupinus superbus Heller var. bernardianus Abrams ex C.P. Sm. | LUSUB3 |
| Lupinus polyphyllus ssp. polyphyllus var. grandifolius | Lupinus grandifolius Lindl. ex J.G. Agardh | LUGR7 |
| Lupinus polyphyllus ssp. polyphyllus var. grandifolius | Lupinus macrophyllus Benth. | LUMA10 |
| Lupinus polyphyllus ssp. polyphyllus var. grandifolius | Lupinus magnus Greene | LUMA8 |
| Lupinus polyphyllus ssp. polyphyllus var. pallidipes | Lupinus pallidipes Heller | LUPA12 |
| Lupinus polyphyllus ssp. polyphyllus var. polyphyllus | Lupinus matanuskensis C.P. Sm. | LUMA9 |
| Lupinus polyphyllus ssp. polyphyllus var. polyphyllus | Lupinus pseudopolyphyllus C.P. Sm. | LUPS2 |
| Lupinus polyphyllus ssp. polyphyllus var. polyphyllus | Lupinus stationis C.P. Sm. | LUST4 |
| Lupinus polyphyllus ssp. superbus | Lupinus alilatissimus C.P. Sm. | LUAL12 |
| Lupinus polyphyllus ssp. superbus | Lupinus apodotropis Heller | LUAP2 |
| Lupinus polyphyllus ssp. superbus | Lupinus carolus-bucarii C.P. Sm. | LUCA11 |
| Lupinus polyphyllus ssp. superbus | Lupinus elongatus Greene ex Heller | LUEL3 |
| Lupinus polyphyllus ssp. superbus | Lupinus lacus-huntingtonii C.P. Sm. | LULA12 |
| Lupinus polyphyllus ssp. superbus | Lupinus melicampestris C.P. Sm. | LUME3 |
| Lupinus polyphyllus ssp. superbus | Lupinus perglaber Eastw. | LUPE12 |
| Lupinus polyphyllus ssp. superbus | Lupinus piperitus A. Davids. | LUPI4 |
| Lupinus polyphyllus ssp. superbus | Lupinus piperitus A. Davids. var. sparsipilosus Eastw. | LUPIS2 |
| Lupinus polyphyllus ssp. superbus | Lupinus pratolacunosum C.P. Sm. | LUPR3 |
| Lupinus polyphyllus ssp. superbus | Lupinus procerus Greene ex Heller | LUPR4 |
| Lupinus polyphyllus ssp. superbus | Lupinus sabulii C.P. Sm. | LUSA5 |
| Lupinus polyphyllus ssp. superbus | Lupinus sabulii C.P. Sm. var. subpersistens C.P. Sm. | LUSAS3 |
| Lupinus polyphyllus ssp. superbus | Lupinus superbus Heller | LUSU6 |
| Lupinus polyphyllus ssp. superbus | Lupinus superbus Heller var. elongatus (Greene ex Heller) C.P. Sm. | LUSUE |
| Lupinus polyphyllus ssp. superbus | Lupinus viridicalyx C.P. Sm. | LUVI5 |
| Lupinus pratensis var. pratensis | Lupinus sellulus Kellogg var. elatus Eastw. | LUSEE3 |
| Lupinus prunophilus | Lupinus arcticus S. Wats. var. prunophilus (M.E. Jones) C.P. Sm. | LUARP6 |
| Lupinus prunophilus | Lupinus polyphyllus Lindl. var. prunophilus (M.E. Jones) L. Phillips | LUPOP5 |
| Lupinus prunophilus | Lupinus wyethii S. Wats. var. prunophilus (M.E. Jones) C.P. Sm. | LUWYP |
| Lupinus pusillus ssp. intermontanus | Lupinus intermontanus Heller | LUIN5 |
| Lupinus pusillus ssp. intermontanus | Lupinus pusillus Pursh var. intermontanus (Heller) C.P. Sm. | LUPUI3 |
| Lupinus pusillus ssp. rubens | Lupinus odoratus Heller var. rubens (Rydb.) Jepson | LUODR |
| Lupinus pusillus ssp. rubens | Lupinus pusillus Pursh var. rubens (Rydb.) Welsh | LUPUR2 |
| Lupinus pusillus ssp. rubens | Lupinus rubens Rydb. | LURU4 |
| Lupinus rivularis | Lupinus lignipes Heller | LULI5 |
| Lupinus ruber | Lupinus microcarpus Sims var. ruber (Heller) C.P. Sm. | LUMIR2 |
| Lupinus sabinianus | Lupinus sabinei Dougl. ex Hook. | LUSA4 |
| Lupinus sabinianus | Lupinus sericeus Pursh ssp. sabinei (Dougl. ex Hook.) L. Phillips | LUSES5 |
| Lupinus saxosus var. saxosus | Lupinus polyphyllus Lindl. var. saxosus (T.J. Howell) Barneby | LUPOS2 |
| Lupinus saxosus var. subsericeus | Lupinus subsericeus B.L. Robins. ex Piper | LUSU13 |
| Lupinus sellulus ssp. sellulus var. artulus | Lupinus lepidus Dougl. ex Lindl. var. artulus Jepson | LULEA2 |
| Lupinus sellulus ssp. sellulus var. lobbii | Lupinus aridus Dougl. var. lobbii Gray ex S. Wats. | LUARL6 |
| Lupinus sellulus ssp. sellulus var. lobbii | Lupinus chionophilus Greene ex C.F. Baker | LUCH4 |
| Lupinus sellulus ssp. sellulus var. lobbii | Lupinus lepidus Dougl. ex Lindl. var. lobbii (Gray ex S. Wats.) C.L. Hitchc. | LULEL3 |
| Lupinus sellulus ssp. sellulus var. lobbii | Lupinus lobbii (Gray ex S. Wats.) Gray ex Greene | LULO5 |
| Lupinus sellulus ssp. sellulus var. lobbii | Lupinus lyallii Gray var. lobbii (Gray ex S. Wats.) C.P. Sm. | LULYL3 |
| Lupinus sellulus ssp. sellulus var. medius | Lupinus lepidus Dougl. ex Lindl. ssp. medius Detling | LULEM3 |
| Lupinus sellulus ssp. sellulus var. medius | Lupinus lepidus Dougl. ex Lindl. var. medius (Detling) C.L. Hitchc. | LULEM2 |
| Lupinus sellulus ssp. sellulus var. sellulus | Lupinus aridus Dougl. var. torreyi (Gray ex S. Wats.) C.P. Sm. | LUART2 |
| Lupinus sellulus ssp. sellulus var. sellulus | Lupinus lepidus Dougl. ex Lindl. var. sellulus (Kellogg) Barneby | LULES2 |
| Lupinus sellulus ssp. sellulus var. sellulus | Lupinus lepidus Dougl. ex Lindl. var. torreyi (Gray ex S. Wats.) Jepson | LULET2 |
| Lupinus sellulus ssp. ursinus | Lupinus sellulus Kellogg var. ursinus (Eastw.) Cox | LUSEU2 |
| Lupinus sellulus ssp. ursinus | Lupinus ursinus Eastw. | LUUR2 |
| Lupinus sericeus ssp. huffmanii | Lupinus aegra-ovium C.P. Sm. | LUAE2 |
| Lupinus sericeus ssp. huffmanii | Lupinus huffmanii C.P. Sm. | LUHU4 |
| Lupinus sericeus ssp. huffmanii | Lupinus larsonanus C.P. Sm. | LULA15 |
| Lupinus sericeus ssp. huffmanii | Lupinus puroviridus C.P. Sm. | LUPU4 |
| Lupinus sericeus ssp. huffmanii | Lupinus quercus-jugi C.P. Sm. | LUQU2 |
| Lupinus sericeus ssp. huffmanii | Lupinus rickeri C.P. Sm. | LURI3 |
| Lupinus sericeus ssp. marianus | Lupinus marianus Rydb. | LUMA14 |
| Lupinus sericeus ssp. marianus | Lupinus sericeus Pursh var. marianus (Rydb.) Welsh | LUSEM6 |
| Lupinus sericeus ssp. sericeus var. egglestonianus | Lupinus buckinghamii C.P. Sm. | LUBU4 |
| Lupinus sericeus ssp. sericeus var. egglestonianus | Lupinus flavicaulis Rydb. | LUFL4 |
| Lupinus sericeus ssp. sericeus var. egglestonianus | Lupinus huilcoflorus C.P. Sm. | LUHU5 |
| Lupinus sericeus ssp. sericeus var. egglestonianus | Lupinus ramosus A. Nels. | LURA2 |
| Lupinus sericeus ssp. sericeus var. egglestonianus | Lupinus spiraeaphilus C.P. Sm. | LUSP10 |
| Lupinus sericeus ssp. sericeus var. egglestonianus | Lupinus tuckerianus C.P. Sm. | LUTU3 |
| Lupinus sericeus ssp. sericeus var. flexuosus | Lupinus fikeranus C.P. Sm. | LUFI2 |
| Lupinus sericeus ssp. sericeus var. flexuosus | Lupinus flexuosus Lindl. ex J.G. Agardh | LUFL5 |
| Lupinus sericeus ssp. sericeus var. flexuosus | Lupinus sericeus Pursh var. fikeranus (C.P. Sm.) C.L. Hitchc. | LUSEF3 |
| Lupinus sericeus ssp. sericeus var. flexuosus | Lupinus sericeus Pursh var. subflexuosus St. John & Warren | LUSES6 |
| Lupinus sericeus ssp. sericeus var. flexuosus | Lupinus subulatus Rydb. | LUSU14 |
| Lupinus sericeus ssp. sericeus var. sericeus | Lupinus aliumbellatus C.P. Sm. | LUAL14 |
| Lupinus sericeus ssp. sericeus var. sericeus | Lupinus amniculi-salicis C.P. Sm. | LUAM5 |
| Lupinus sericeus ssp. sericeus var. sericeus | Lupinus blankinshipii Heller | LUBL2 |
| Lupinus sericeus ssp. sericeus var. sericeus | Lupinus falsocomatus C.P. Sm. | LUFA2 |
| Lupinus sericeus ssp. sericeus var. sericeus | Lupinus herman-workii C.P. Sm. | LUHE3 |
| Lupinus sericeus ssp. sericeus var. sericeus | Lupinus jonesii Blank., non Rydb. | LUJO3 |
| Lupinus sericeus ssp. sericeus var. sericeus | Lupinus leucopsis J.G. Agardh | LULE8 |
| Lupinus sericeus ssp. sericeus var. thompsonianus | Lupinus latifolius Lindl. ex J.G. Agardh var. thompsonianus (C.P. Sm.) C.L. Hitchc. | LULAT2 |
| Lupinus sierrae-blancae ssp. aquilinus | Lupinus aquilinus Woot. & Standl. | LUAQ |
| Lupinus sierrae-blancae ssp. sierrae-blancae | Lupinus laetus Woot. & Standl. | LULA13 |
| Lupinus sparsiflorus ssp. inopinatus | Lupinus sparsiflorus Benth. var. inopinatus C.P. Sm. | LUSPI3 |
| Lupinus sparsiflorus ssp. mohavensis | Lupinus sparsiflorus Benth. var. mohavensis (Dziekanowski & D. Dunn) Welsh | LUSPM3 |
| Lupinus sparsiflorus ssp. pondii | Lupinus pondii Greene | LUPO5 |
| Lupinus sparsiflorus ssp. pondii | Lupinus sparsiflorus Benth. var. pondii (Greene) C.P. Sm. | LUSPP2 |
| Lupinus spectabilis | Lupinus nanus Dougl. ex Benth. var. perlasius C.P. Sm. | LUNAP |
| Lupinus subvexus var. subvexus | Lupinus microcarpus Sims | LUMI9 |
| Lupinus subvexus var. subvexus | Lupinus microcarpus Sims var. microcarpus Sims [superfluous autonym] | LUMIM4 |
| Lupinus subvexus var. subvexus | Lupinus subvexus C.P. Sm. var. insularis C.P. Sm. | LUSUI |
| Lupinus subvexus var. subvexus | Lupinus subvexus C.P. Sm. var. nigrescens C.P. Sm. | LUSUN |
| Lupinus subvexus var. transmontanus | Lupinus subvexus C.P. Sm. var. flutivalis C.P. Sm. | LUSUF |
| Lupinus subvexus var. transmontanus | Lupinus subvexus C.P. Sm. var. liebergii C.P. Sm. | LUSUL |
| Lupinus succulentus | Lupinus succulentus Dougl. ex K. Koch var. layneae C.P. Sm. | LUSUL2 |
| Lupinus sulphureus | Lupinus sulphureus Dougl. ex Hook. var. applegateanus C.P. Sm. | LUSUA2 |
| Lupinus sulphureus | Lupinus sulphureus Dougl. ex Hook. var. echleranus C.P. Sm. | LUSUE2 |
| Lupinus tidestromii var. layneae | Lupinus layneae Eastw. | LULA19 |
| Lupinus tidestromii var. layneae | Lupinus littoralis Dougl. var. layneae (Eastw.) Isely | LULIL |
| Lupinus truncatus | Lupinus truncatus Nutt. ex Hook. & Arn. var. burlewii C.P. Sm. | LUTRB |
| Lupinus vallicola ssp. apricus | Lupinus apricus Greene | LUAP3 |
| Lupinus vallicola ssp. apricus | Lupinus nanus Dougl. ex Benth. var. apricus (Greene) C.P. Sm. | LUNAA |
| Lupinus vallicola ssp. apricus | Lupinus vallicola Heller var. apricus (Greene) C.P. Sm. | LUVAA2 |
| Lupinus vallicola ssp. vallicola | Lupinus blaisdellii Eastw. | LUBL3 |
| Lupinus vallicola ssp. vallicola | Lupinus nanus Dougl. ex Benth. var. vallicola (Heller) C.P. Sm. | LUNAV |
| Lupinus vallicola ssp. vallicola | Lupinus persistens Heller, non Rose | LUPE10 |
| Lupinus versicolor | Lupinus franciscanus Greene | LUFR3 |
| Lupinus versicolor | Lupinus littoralis Dougl. var. variicolor (Steud.) Isely | LULIV |
| Lupinus versicolor | Lupinus micheneri Greene | LUMI12 |
| Lupinus versicolor | Lupinus varicolor Steud. [orthographic variant] | LUVA |
| Lupinus versicolor | Lupinus variicolor Steud. | LUVA5 |
| Lupinus westianus var. aridorum | Lupinus aridorum McFarlin ex Beckner | LUAR11 |
| Lupinus wyethii ssp. tetonensis | Lupinus arcticus S. Wats. var. tetonensis (E. Nels.) C.P. Sm. | LUART3 |
| Lupinus wyethii ssp. tetonensis | Lupinus humicola A. Nels. var. tetonensis E. Nels. | LUHUT |
| Lupinus wyethii ssp. wyethii | Lupinus arcticus S. Wats. var. humicola (A. Nels.) C.P. Sm. | LUARH2 |
| Lupinus wyethii ssp. wyethii | Lupinus candicans Rydb. | LUCA12 |
| Lupinus wyethii ssp. wyethii | Lupinus diversalpicola C.P. Sm. | LUDI4 |
| Lupinus wyethii ssp. wyethii | Lupinus flavescens Rydb. | LUFL6 |
| Lupinus wyethii ssp. wyethii | Lupinus humicola A. Nels. | LUHU2 |
| Lupinus wyethii ssp. wyethii | Lupinus polyphyllus Lindl. var. humicola (A. Nels.) Barneby | LUPOH |
| Lupinus wyethii ssp. wyethii | Lupinus rydbergii Blank. | LURY |
| Lyall's milkvetch | Astragalus lyallii Gray | ASLY |
| Lysiloma divaricatum | Lysiloma microphyllum Benth. | LYMI4 |
| Lysiloma latisiliquum | Leucaena latisiliqua (L.) Gillis & Stearn | LELA39 |
| Lysiloma latisiliquum | Lysiloma bahamense Benth. | LYBA5 |
| Lysiloma watsonii | Lysiloma microphyllum Benth. var. thornberi (Britt. & Rose) Isely | LYMIT |
| Lysiloma watsonii | Lysiloma thornberi Britt. & Rose | LYTH3 |
| maackia | Maackia Rupr. | MAACK |
| macata bourse bastard | Acacia vogeliana Steud. | ACVO |
| machaerium | Machaerium Pers. | MACHA4 |
| Machaerium lunatum | Drepanocarpus lunatus (L. f.) G.F.W. Mey. | DRLU3 |
| machete | Erythrina berteriana Urban | ERBE3 |
| Macroptilium atropurpureum | Phaseolus atropurpureus Moc. & Sess? ex DC. | PHAT |
| Macroptilium bracteatum | Phaseolus bracteatus Nees & Mart. | PHBR13 |
| Macroptilium gibbosifolium | Macroptilium heterophyllum (Willd.) Mar?chal & Baudet | MAHE6 |
| Macroptilium gibbosifolium | Macroptilium heterophyllum (Willd.) Mar?chal & Baudet var. rotundifolium (Gray) Mar?chal, Mascherpa & Stanier | MAHER |
| Macroptilium gibbosifolium | Phaseolus heterophyllus Willd. | PHHE3 |
| Macroptilium gibbosifolium | Phaseolus heterophyllus Willd. var. rotundifolius (Gray) Piper | PHHER |
| Macroptilium lathyroides | Phaseolus lathyroides L. | PHLA6 |
| Macroptilium lathyroides | Phaseolus semierectus L. | PHSE18 |
| Macroptilium supinum | Phaseolus supinus Wiggins & Rollins | PHSU11 |
| macrotyloma | Macrotyloma (Wight & Arnott) Verdc. | MACRO5 |
| Macrotyloma axillare var. axillare | Dolichos axillaris E. Mey. | DOAX2 |
| Macrotyloma geocarpum | Kerstingiella geocarpa Harms | KEGE |
| Macrotyloma tenuiflorum | Dolichos baumannii Harms | DOBA2 |
| Macrotyloma uniflorum | Dolichos biflorus auct. | DOBI4 |
| Macrotyloma uniflorum | Dolichos uniflorus Lam. | DOUN2 |
| Madeira Dyer's greenweed | Genista maderensis (Webb & Berth.) Lowe | GEMA10 |
| Maguire's milkvetch | Astragalus cobrensis Gray var. maguirei Kearney | ASCOM |
| mahogany | Afzelia Smith | AFZEL |
| Makaha Valley jackbean | Canavalia napaliensis St. John | CANA4 |
| Malabar kino | Pterocarpus marsupium Roxb. | PTMA3 |
| Malaysian scurfpea | Cullen corylifolia (L.) Medik. | CUCO7 |
| mamani | Sophora chrysophylla (Salisb.) Seem. | SOCH |
| Mancos milkvetch | Astragalus humillimus Gray | ASHU |
| manna wattle | Acacia microcarpa F. Muell. | ACMI6 |
| manycolored lupine | Lupinus versicolor Lindl. | LUVE |
| manystem pea | Lathyrus polymorphus Nutt. | LAPO2 |
| manystem pea | Lathyrus polymorphus Nutt. ssp. polymorphus | LAPOP |
| manystem pea | Lathyrus polymorphus Nutt. ssp. polymorphus var. hapemanii (A. Nels.) C.L. Hitchc. | LAPOH |
| manystem pea | Lathyrus polymorphus Nutt. ssp. polymorphus var. polymorphus | LAPOP2 |
| Maricopa milkvetch | Astragalus lentiginosus Dougl. ex Hook. var. maricopae Barneby | ASLEM2 |
| Marina calycosa | Dalea calycosa Gray | DACA10 |
| Marina diffusa | Dalea diffusa Moric. | DADI4 |
| Marina orcuttii | Marina orcuttii (S. Watson) Barneby var. orcuttii (S. Watson) Barneby [superfluous autonym] | MAORO2 |
| Marina parryi | Dalea parryi Torr. & Gray | DAPA5 |
| marsh milkvetch | Astragalus pycnostachyus Gray | ASPY |
| marsh milkvetch | Astragalus pycnostachyus Gray var. lanosissimus (Rydb.) Munz & McBurney | ASPYL |
| marsh milkvetch | Astragalus pycnostachyus Gray var. pycnostachyus | ASPYP |
| marsh pea | Lathyrus palustris L. | LAPA4 |
| Martin's clover | Trifolium eriocephalum Nutt. ssp. martinii J. Gillett | TRERM |
| Maryland senna | Senna marilandica (L.) Link | SEMA11 |
| Masai clover | Trifolium masaiense J. B. Gillett | TRMA16 |
| mat milkvetch | Astragalus kentrophyta Gray var. tegetarius (S. Wats.) Dorn | ASKET |
| mat vetch | Vicia americana Muhl. ex Willd. ssp. minor (Hook.) C.R. Gunn | VIAMM3 |
| mato | Caesalpinia ciliata (Bergius ex Wikstr.) Urban | CACI19 |
| matted lupine | Lupinus breweri Gray var. bryoides C.P. Sm. | LUBRB |
| matted lupine | Lupinus breweri Gray var. grandiflorus C.P. Sm. | LUBRG |
| matted lupine | Lupinus breweri Gray var. parvulus C.P. Sm. | LUBRP |
| maunaloa | Canavalia cathartica Thouars | CACA29 |
| Maydell's oxytrope | Oxytropis maydelliana Trautv. | OXMA2 |
| meadow bird's-foot trefoil | Lotus pinnatus Hook. | LOPI2 |
| meadow jointvetch | Aeschynomene pratensis Small | AEPR |
| meadow milkvetch | Astragalus diversifolius Gray | ASDI5 |
| meadow pea | Lathyrus pratensis L. | LAPR |
| Mearns's bird's-foot trefoil | Lotus mearnsii (Britt.) Greene | LOME |
| Mearns's bird's-foot trefoil | Lotus mearnsii (Britt.) Greene var. equisolensis J.L. Anderson | LOMEE |
| Mearns's bird's-foot trefoil | Lotus mearnsii (Britt.) Greene var. mearnsii | LOMEM |
| Mearns's neonotonia | Neonotonia wightii (Wight & Arn.) Lackey var. mearnsii (De Wild.) Lackey | NEWIM |
| Medicago arabica | Medicago arabica (L.) Huds. ssp. inermis Ricker | MEARI |
| Medicago arabica | Medicago maculata Sibth. | MEMA13 |
| Medicago brachycarpa | Trigonella brachycarpa (Fisch. ex M. Bieb.) Moris | TRBR15 |
| Medicago doliata var. muricata | Medicago aculeata Willd., nom. illeg. [anomalous] | MEAC4 |
| Medicago doliata var. muricata | Medicago muricata Benth., nom. illeg. [anomalous] | MEMU9 |
| Medicago heldreichii | Trigonella polycarpa Boiss. & Heldr. | TRPO8 |
| Medicago italica | Medicago obscura Retz. | MEOB7 |
| Medicago italica | Medicago tornata (L.) Mill. | METO7 |
| Medicago italica | Medicago tornata (L.) Mill. var. rugulosa (Ser.) Heyn, nom. illeg. [anomalous] | METOR |
| Medicago laciniata | Medicago aschersoniana Urb. | MEAS4 |
| Medicago laciniata | Trigonella laciniata auct. non L. [misapplied] | TRLA26 |
| Medicago littoralis | Medicago littoralis Rhode ex Loisel. var. inermis Moris | MELII |
| Medicago lupulina | Medicago lupulina L. var. cupaniana (Guss.) Boiss. | MELUC |
| Medicago lupulina | Medicago lupulina L. var. glandulosa Neilr. | MELUG |
| Medicago minima | Medicago minima (L.) L. var. compacta Neyraut | MEMIC |
| Medicago minima | Medicago minima (L.) L. var. longiseta DC. | MEMIL |
| Medicago minima | Medicago minima (L.) L. var. pubescens Webb | MEMIP |
| Medicago monantha | Trigonella neoana Boiss. | TRNE8 |
| Medicago monspeliaca | Trigonella monspeliaca L. | TRMO7 |
| Medicago orbicularis | Medicago orbicularis (L.) Bartal. var. marginata (Willd.) Benth. | MEORM2 |
| Medicago polyceratia | Trigonella polyceratia L. | TRPO10 |
| Medicago polymorpha | Medicago apiculata auct. non Willd. [misapplied] | MEAP3 |
| Medicago polymorpha | Medicago denticulata Willd. | MEDE13 |
| Medicago polymorpha | Medicago hispida Gaertn. | MEHI |
| Medicago polymorpha | Medicago hispida Gaertn. var. apiculata (Willd.) Urban | MEHIA |
| Medicago polymorpha | Medicago hispida Gaertn. var. confinis (W.D.J. Koch) Burnat | MEHIC |
| Medicago polymorpha | Medicago polycarpa Willd. | MEPO8 |
| Medicago polymorpha | Medicago polymorpha L. | MEPOA2 |
| Medicago polymorpha | Medicago polymorpha L. var. brevispina (Benth.) Heyn | MEPOB |
| Medicago polymorpha | Medicago polymorpha L. var. ciliaris (Ser.) Shinners | MEPOC |
| Medicago polymorpha | Medicago polymorpha L. var. polygyra (Urban) Shinners | MEPOP7 |
| Medicago polymorpha | Medicago polymorpha L. var. tricycla (Gren. & Godr.) Shinners | MEPOT |
| Medicago polymorpha | Medicago polymorpha L. var. vulgaris (Benth.) Shinners | MEPOV |
| Medicago popovii | Trigonella popovii Korovin | TRPO11 |
| Medicago ruthenica | Trigonella ruthenica L. | TRRU10 |
| Medicago sativa ssp. ?tunetana | Medicago tunetana (Murb.) Vassilcz. | METU6 |
| Medicago sativa ssp. falcata | Medicago falcata L. | MEFA |
| Medicago sativa ssp. falcata | Medicago falcata L. var. romanica (Prodan) O. Schwarz & Klink. | MEFAR2 |
| Medicago sativa ssp. sativa | Medicago ?varia Martyn | MEVA2 |
| Medicago sativa ssp. sativa | Medicago media Pers. | MEME9 |
| Medicago sativa ssp. sativa | Medicago sativa L. ssp. varia (Martyn) Arcang. | MESAV8 |
| Medicago shepardii | Medicago tornata (L.) Mill. var. shepardii (Post ex Boiss.) Heyn | METOS |
| Medicago truncatula | Medicago tribuloides Desr. ex Lam. | METR11 |
| Medicago turbinata | Medicago tuberculata (Retz.) Willd. | METU5 |
| Medicago turbinata | Medicago turbinata (L.) All. var. aculeata (Moris) Heyn | METUA |
| medick | Medicago monantha (C.A. Mey.) Trautv. | MEMO10 |
| Mediterranean broom | Genista linifolia L. | GELI5 |
| Mediterranean clover | Trifolium spumosum L. | TRSP82 |
| Mediterranean crownvetch | Coronilla valentina L. | COVA4 |
| Mediterranean medick | Medicago praecox DC. | MEPR |
| Mediterranean sweetclover | Melilotus sulcatus Desf. | MESU2 |
| Medusa clover | Trifolium meduseum Blanche ex Boiss. | TRME10 |
| Melilotus altissimus | Melilotus altissima Thuill. [orthographic variant] | MEAL13 |
| Melilotus indicus | Melilotus indica (L.) All. [orthographic variant] | MEIN14 |
| Melilotus officinalis | Melilotus alba Medikus [orthographic variant] | MEAL12 |
| Melilotus officinalis | Melilotus albus Medik. | MEAL2 |
| Melilotus officinalis | Melilotus albus Medik. var. annuus Coe | MEALA2 |
| Melilotus officinalis | Melilotus arvensis Wallr. | MEAR15 |
| Melilotus officinalis | Melilotus leucanthus W. D. J. Koch ex DC. | MELE6 |
| Melilotus officinalis | Melilotus lutea Gueldenst. | MELU6 |
| Melilotus officinalis | Melilotus officinalis (L.) Lam. var. micranthus O. E. Schulz | MEOFM2 |
| Melilotus siculus | Melilotus messanensis (L.) All. | MEME11 |
| Melilotus sulcatus | Melilotus gracilis DC. | MEGR10 |
| Melilotus sulcatus | Melilotus neapolitanus Ten. | MENE |
| Melolobium aethiopicum | Melolobium cernuum (L.) Eckl. & Zeyh. | MECE2 |
| Menker's lupine | Lupinus nanus Dougl. ex Benth. ssp. menkerae (C.P. Sm.) D. Dunn | LUNAM |
| Mertens's oxytrope | Oxytropis mertensiana Turcz. | OXME2 |
| mescal bean | Sophora secundiflora (Ortega) Lag. ex DC. | SOSE3 |
| mesquite | Prosopis juliflora (Sw.) DC. | PRJU3 |
| mesquite | Prosopis L. | PROSO |
| Metcalfe's ticktrefoil | Desmodium metcalfei (Rose & Painter) Kearney & Peebles | DEME2 |
| Mexican cologania | Cologania pulchella Kunth | COPU4 |
| Mexican holdback | Caesalpinia mexicana Gray | CAME |
| Mexican mimosa | Mimosa distachya Cav. | MIDI12 |
| Mexican prairie clover | Dalea exserta (Rydb.) Gentry | DAEX3 |
| Mexican redbud | Cercis canadensis L. var. mexicana (Rose) M. Hopkins | CECAM |
| Mexican senna | Senna mexicana (Jacq.) Irwin & Barneby | SEME4 |
| Michaux's snoutbean | Rhynchosia michauxii Vail | RHMI10 |
| miege clover | Trifolium miegeanum Maire | TRMI18 |
| milfoil wattle | Acacia millefolia S. Wats. | ACMI |
| milkpea | Galactia P. Br. | GALAC |
| milkvetch | Astragalus edulis Durieu ex Bunge | ASED2 |
| milkvetch | Astragalus L. | ASTRA |
| milkweed milkvetch | Astragalus asclepiadoides M.E. Jones | ASAS2 |
| Millettia pinnata | Derris indica (Lam.) Bennett | DEIN6 |
| Millettia pinnata | Pongamia glabra Vent. | POGL17 |
| Millettia pinnata | Pongamia pinnata (L.) Pierre | POPI4 |
| Mimosa aculeaticarpa var. biuncifera | Mimosa biuncifera Benth. | MIBI3 |
| Mimosa aculeaticarpa var. biuncifera | Mimosa biuncifera Benth. var. glabrescens Gray | MIBIG |
| Mimosa aculeaticarpa var. biuncifera | Mimosa biuncifera Benth. var. lindheimeri (Gray) B.L. Robins. | MIBIL |
| Mimosa aculeaticarpa var. biuncifera | Mimosa lindheimeri Gray | MILI6 |
| Mimosa aculeaticarpa var. biuncifera | Mimosa warnockii B.L. Turner | MIWA |
| Mimosa aculeaticarpa var. biuncifera | Mimosopsis biuncifera (Benth.) Britt. & Rose | MIBI12 |
| Mimosa arenosa | Acacia arenosa Willd. | ACAR3 |
| Mimosa asperata | Mimosa pigra L. var. berlandieri (Gray) B.L. Turner | MIPIB |
| Mimosa diplotricha | Mimosa invisa Mart., non Mart. ex Colla | MIIN80 |
| Mimosa distachya var. laxiflora | Mimosa laxiflora Benth. | MILA2 |
| Mimosa dysocarpa | Mimosa dysocarpa Benth. var. wrightii (Gray) Kearney & Peebles | MIDYW |
| Mimosa grahamii | Mimosa grahamii Gray var. lemmonii (Gray) Kearney & Peebles | MIGRL |
| Mimosa hystricina | Leptoglottis hystricina Small ex Britt. & Rose | LEHY3 |
| Mimosa hystricina | Mimosa quadrivalvis L. var. hystricina (Small ex Britt. & Rose) Barneby | MIQUH2 |
| Mimosa hystricina | Schrankia hystricina (Small ex Britt. & Rose) Standl. | SCHY2 |
| Mimosa hystricina | Schrankia nuttalii (DC. ex Britt. & Rose) Standl. var. hystricina (Small ex Britt. & Rose) Isley [orthographic error] | SCNUH2 |
| Mimosa hystricina | Schrankia nuttallii (DC. ex Britt. & Rose) Standl. var. hystricina (Small ex Britt. & Rose) Isley | SCNUH3 |
| Mimosa latidens | Mimosa quadrivalvis L. var. latidens (Small) Barneby | MIQUL |
| Mimosa latidens | Morongia latidens Small | MOLA11 |
| Mimosa latidens | Schrankia latidens (Small) K. Schum. | SCLA3 |
| Mimosa microphylla | Leptoglottis angustisiliqua Britt. & Rose | LEAN4 |
| Mimosa microphylla | Leptoglottis chapmanii Small ex Britt. & Rose | LECH4 |
| Mimosa microphylla | Leptoglottis microphylla (Dry.) Britt. & Rose | LEMI8 |
| Mimosa microphylla | Mimosa quadrivalvis L. var. angustata (Torr. & Gray) Barneby | MIQUA |
| Mimosa microphylla | Morongia angustata (Torr. & Gray) Britt. | MOAN2 |
| Mimosa microphylla | Morongia microphylla (Dry.) Britt. | MOMI3 |
| Mimosa microphylla | Morongia uncinata (Willd.) Britt. | MOUN4 |
| Mimosa microphylla | Schrankia angustata Torr. & Gray | SCAN9 |
| Mimosa microphylla | Schrankia microphylla (Dry.) J.F. Macbr. | SCMI |
| Mimosa microphylla | Schrankia uncinata Willd. | SCUN |
| Mimosa nuttallii | Leptoglottis nuttallii DC. | LENU6 |
| Mimosa nuttallii | Mimosa quadrivalvis L. var. nuttallii (DC.) Barneby | MIQUN2 |
| Mimosa nuttallii | Schrankia nuttallii (DC.) Standl. | SCNU |
| Mimosa pellita | Mimosa pigra auct. non L. [misapplied] | MIPI |
| Mimosa quadrivalvis var. ?leptocarpa | Schrankia leptocarpa DC. | SCLE3 |
| Mimosa quadrivalvis var. floridana | Leptoglottis floridana (Chapman) Small ex Britt. & Rose | LEFL7 |
| Mimosa quadrivalvis var. floridana | Schrankia floridana Chapman | SCFL7 |
| Mimosa quadrivalvis var. floridana | Schrankia microphylla (Dry.) J.F. Macbr. var. floridana (Chapman) Isley | SCMIF |
| Mimosa quadrivalvis var. nelsonii | Leptoglottis nelsonii Britt. & Rose | LENE17 |
| Mimosa quadrivalvis var. urbaniana | Morongia portoricensis (Urban) Britt. | MOPO |
| Mimosa quadrivalvis var. urbaniana | Schrankia portoricensis Urban | SCPO3 |
| Mimosa roemeriana | Mimosa quadrivalvis L. var. platycarpa (Gray) Barneby | MIQUP |
| Mimosa roemeriana | Schrankia roemeriana (Scheele) Blank. | SCRO4 |
| Mimosa rupertiana | Leptoglottis occidentalis (Woot. & Standl.) Britt. | LEOC2 |
| Mimosa rupertiana | Mimosa occidentalis (Woot. & Standl.) B. L. Turner | MIOC2 |
| Mimosa rupertiana | Mimosa quadrivalvis L. var. occidentalis (Woot. & Standl.) Barneby | MIQUO |
| Mimosa rupertiana | Morongia occidentalis Woot. & Standl. | MOOC |
| Mimosa rupertiana | Schrankia occidentalis (Woot. & Standl.) Standl. | SCOC |
| Mimosa texana | Mimosa biuncifera Benth. var. lindheimeri auct. non (Gray) B.L. Robins. [misapplied] | MIBIL2 |
| Mimosa texana | Mimosa borealis Gray var. texana Gray | MIBOT |
| Mimosa texana | Mimosa wherryana (Britt.) Standl. | MIWH |
| Mimosa texana | Mimosopsis wherryana Britt. | MIWH4 |
| Mimosa turneri | Mimosa zygophylla auct. non Benth. [misapplied] | MIZY |
| miniature lupine | Lupinus bicolor Lindl. | LUBI |
| miniature lupine | Lupinus bicolor Lindl. ssp. bicolor | LUBIB |
| miniature lupine | Lupinus bicolor Lindl. ssp. marginatus D. Dunn | LUBIM |
| miniature lupine | Lupinus bicolor Lindl. ssp. microphyllus (S. Wats.) D. Dunn | LUBIM2 |
| miniature lupine | Lupinus bicolor Lindl. ssp. pipersmithii (Heller) D. Dunn | LUBIP |
| miniature lupine | Lupinus bicolor Lindl. ssp. tridentatus (Eastw. ex C.P. Sm.) D. Dunn | LUBIT |
| miniature lupine | Lupinus bicolor Lindl. ssp. tridentatus (Eastw. ex C.P. Sm.) D. Dunn var. rostratus (Eastw.) Jepson | LUBIR |
| miniature lupine | Lupinus bicolor Lindl. ssp. tridentatus (Eastw. ex C.P. Sm.) D. Dunn var. tridentatus Eastw. ex C.P. Sm. | LUBIT3 |
| miniature lupine | Lupinus bicolor Lindl. ssp. umbellatus (Greene) D. Dunn | LUBIU |
| miniature lupine | Lupinus bicolor Lindl. ssp. umbellatus (Greene) D. Dunn var. trifidus (Torr. ex S. Wats.) C.P. Sm. | LUBIT6 |
| miniature lupine | Lupinus bicolor Lindl. ssp. umbellatus (Greene) D. Dunn var. umbellatus (Greene) C.P. Sm. | LUBIU2 |
| Minthorn's milkvetch | Astragalus minthorniae (Rydb.) Jepson | ASMI7 |
| Minthorn's milkvetch | Astragalus minthorniae (Rydb.) Jepson var. minthorniae | ASMIM2 |
| Minthorn's milkvetch | Astragalus minthorniae (Rydb.) Jepson var. villosus Barneby | ASMIV |
| Missouri milkvetch | Astragalus missouriensis Nutt. | ASMI10 |
| Missouri milkvetch | Astragalus missouriensis Nutt. var. amphibolus Barneby | ASMIA |
| Missouri milkvetch | Astragalus missouriensis Nutt. var. humistratus Isely | ASMIH2 |
| Missouri milkvetch | Astragalus missouriensis Nutt. var. missouriensis | ASMIM5 |
| Moab milkvetch | Astragalus coltonii M.E. Jones var. moabensis M.E. Jones | ASCOM2 |
| Moenkopi milkvetch | Astragalus moencoppensis M.E. Jones | ASMO4 |
| Mogollon Mountain vetch | Vicia leucophaea Greene | VILE3 |
| Mojave indigobush | Psorothamnus arborescens (Torr. ex Gray) Barneby | PSAR4 |
| Mojave indigobush | Psorothamnus arborescens (Torr. ex Gray) Barneby var. arborescens | PSARA |
| Mojave indigobush | Psorothamnus arborescens (Torr. ex Gray) Barneby var. pubescens (Parish) Barneby | PSARP |
| Mojave lupine | Lupinus sparsiflorus Benth. | LUSP2 |
| Mojave lupine | Lupinus sparsiflorus Benth. ssp. inopinatus (C.P. Sm.) Dziekanowski & D. Dunn | LUSPI |
| Mojave lupine | Lupinus sparsiflorus Benth. ssp. mohavensis Dziekanowski & D. Dunn | LUSPM |
| Mojave lupine | Lupinus sparsiflorus Benth. ssp. sparsiflorus | LUSPS2 |
| Mojave milkvetch | Astragalus mohavensis S. Wats. | ASMO5 |
| Mojave milkvetch | Astragalus mohavensis S. Wats. var. hemigyrus (Clokey) Barneby | ASMOH |
| Mojave milkvetch | Astragalus mohavensis S. Wats. var. mohavensis | ASMOM4 |
| Mojave royal lupine | Lupinus odoratus Heller | LUOD |
| Mojave royal lupine | Lupinus odoratus Heller var. odoratus | LUODO |
| Mojave royal lupine | Lupinus odoratus Heller var. pilosellus C.P. Sm. | LUODP |
| Mokiak milkvetch | Astragalus mokiacensis Gray | ASMO6 |
| Molokai jackbean | Canavalia molokaiensis O.& I. Deg. & Sauer | CAMO15 |
| moneybush | Dalbergia monetaria L. f. | DAMO3 |
| moneywort | Alysicarpus Neck. ex Desv. | ALYSI |
| monkeypod | Pithecellobium dulce (Roxb.) Benth. | PIDU |
| monkeysoap | Enterolobium cyclocarpum (Jacq.) Griseb. | ENCY |
| Mono clover | Trifolium andersonii Gray ssp. monoense (Greene) J. Gillett | TRANM |
| Mono Lake lupine | Lupinus duranii Eastw. | LUDU |
| Mono locoweed | Astragalus lentiginosus Dougl. ex Hook. var. sesquimetralis (Rydb.) Barneby | ASLES4 |
| Mono lupine | Lupinus sublanatus Eastw. | LUSU2 |
| Mono milkvetch | Astragalus monoensis Barneby | ASMO9 |
| Montana chaparral pea | Pickeringia montana Nutt. ex Torr. & Gray | PIMO5 |
| Montana chaparral pea | Pickeringia montana Nutt. ex Torr. & Gray var. montana | PIMOM |
| Montana chaparral pea | Pickeringia montana Nutt. ex Torr. & Gray var. tomentosa (Abrams) I.M. Johnston | PIMOT2 |
| Montana locoweed | Oxytropis besseyi (Rydb.) Blank. var. argophylla (Rydb.) Barneby | OXBEA |
| Monterey clover | Trifolium trichocalyx Heller | TRTR |
| Monti's milkvetch | Astragalus limnocharis Barneby var. montii (Welsh) Isely | ASLIM |
| Monument Valley milkvetch | Astragalus monumentalis Barneby | ASMO10 |
| Monument Valley milkvetch | Astragalus monumentalis Barneby var. monumentalis | ASMOM6 |
| moon trefoil | Medicago arborea L. | MEAR14 |
| Morro milkvetch | Astragalus curtipes Gray | ASCU3 |
| Morton's Canadian milkvetch | Astragalus canadensis L. var. mortonii (Nutt.) S. Wats. | ASCAM3 |
| moth bean | Vigna aconitifolia (Jacq.) Marechal | VIAC4 |
| mountain bush lupine | Lupinus excubitus M.E. Jones var. austromontanus (Heller) C.P. Sm. | LUEXA |
| mountain carpet clover | Trifolium monanthum Gray | TRMO2 |
| mountain carpet clover | Trifolium monanthum Gray ssp. grantianum (Heller) J. Gillett | TRMOG |
| mountain carpet clover | Trifolium monanthum Gray ssp. monanthum | TRMOM |
| mountain carpet clover | Trifolium monanthum Gray ssp. parvum (Kellogg) J. Gillett | TRMOP |
| mountain carpet clover | Trifolium monanthum Gray ssp. tenerum (Eastw.) J. Gillett | TRMOT |
| mountain clover | Trifolium montanum L. | TRMO19 |
| mountain ebony | Bauhinia variegata L. | BAVA |
| mountain false indigo | Amorpha glabra Desf. ex Poir. | AMGL2 |
| mountain goldenbanner | Thermopsis montana Nutt. | THMO6 |
| mountain goldenbanner | Thermopsis montana Nutt. var. hitchcockii (Isely) M. Mendenhall | THMOH |
| mountain goldenbanner | Thermopsis montana Nutt. var. montana | THMOM3 |
| mountain immortelle | Erythrina poeppigiana (Walp.) O.F. Cook | ERPO5 |
| mountain lupine | Lupinus monticola Rydb. | LUMO4 |
| mountain oxytrope | Oxytropis oreophila Gray | OXOR2 |
| mountain oxytrope | Oxytropis oreophila Gray var. juniperina Welsh | OXORJ |
| mountain oxytrope | Oxytropis oreophila Gray var. oreophila | OXORO |
| Mountain Springs bush lupine | Lupinus excubitus M.E. Jones var. medius (Jepson) Munz | LUEXM |
| mourning milkvetch | Astragalus atratus S. Wats. | ASAT |
| mourning milkvetch | Astragalus atratus S. Wats. var. atratus | ASATA |
| mourning milkvetch | Astragalus atratus S. Wats. var. mensanus M.E. Jones | ASATM |
| Mt. Adams lupine | Lupinus alpicola Henderson ex Piper | LUAL6 |
| Mt. Diablo lupine | Lupinus pachylobus Greene | LUPA2 |
| Mt. Diablo milkvetch | Astragalus oxyphysus Gray | ASOX |
| Mt. Eddy lupine | Lupinus croceus Eastw. | LUCR |
| Mt. Eddy lupine | Lupinus croceus Eastw. var. croceus | LUCRC |
| Mt. Eddy lupine | Lupinus croceus Eastw. var. pilosellus (Eastw.) Munz | LUCRP |
| Mt. Etna broom | Genista aetnensis (Raf. ex Biv.) DC. | GEAE |
| mucuna | Mucuna Adans. | MUCUN |
| mucuna | Mucuna rostrata Benth. | MURO2 |
| Mucuna pruriens var. pruriens | Stizolobium pruriens (L.) Medik. | STPR5 |
| Mucuna pruriens var. pruriens | Stizolobium pruritum (Wight) Piper | STPR4 |
| Mucuna pruriens var. utilis | Mucuna aterrima (Piper & Tracy) Holland | MUAT2 |
| Mucuna pruriens var. utilis | Mucuna deeringiana (Bort) Merr. | MUDE2 |
| Mucuna pruriens var. utilis | Stizolobium aterrimum Piper & Tracy | STAT3 |
| Mucuna pruriens var. utilis | Stizolobium deeringianum Bort | STDE |
| Mucuna pruriens var. utilis | Stizolobium velutinum (Hassk.) Piper & Tracy | STVE5 |
| Mulford's milkvetch | Astragalus mulfordiae M.E. Jones | ASMU |
| mulga | Acacia aneura F. Muell. ex Benth. | ACAN10 |
| multibloom hoarypea | Tephrosia onobrychoides Nutt. | TEON |
| mung bean | Vigna radiata (L.) R. Wilczek | VIRA4 |
| mung bean | Vigna radiata (L.) R. Wilczek var. radiata | VIRAR2 |
| mung bean | Vigna radiata (L.) R. Wilczek var. sublobata (Roxb.) Verdc. | VIRAS |
| myall acacia | Acacia pendula A. Cunn. ex G. Don | ACPE8 |
| myrospermum | Myrospermum Jacq. | MYROS |
| myroxylon | Myroxylon L. f. | MYROX2 |
| Myroxylon balsamum var. pereirae | Myroxylon pereirae (Royle) Klotzsch | MYPE5 |
| naked albizia | Albizia carbonaria Britt. | ALCA8 |
| naked milkvetch | Astragalus serenoi (Kuntze) Sheldon | ASSE4 |
| naked milkvetch | Astragalus serenoi (Kuntze) Sheldon var. serenoi | ASSES3 |
| naked milkvetch | Astragalus serenoi (Kuntze) Sheldon var. sordescens Barneby | ASSES |
| nakedflower ticktrefoil | Desmodium nudiflorum (L.) DC. | DENU4 |
| Napa false indigo | Amorpha californica Nutt. var. napensis Jepson | AMCAN |
| Napa milkvetch | Astragalus clarianus Jepson | ASCL6 |
| Napoleon's plume | Bauhinia monandra Kurz | BAMO2 |
| narrow-leaf bird's-foot trefoil | Lotus glaber P. Mill. | LOGL10 |
| narrow-leaf wattle | Acacia mucronata Willd. ex H. L. Wendl. | ACMU6 |
| narrowflower lupine | Lupinus angustiflorus Eastw. | LUAN3 |
| narrowleaf crimson clover | Trifolium angustifolium L. | TRAN6 |
| narrowleaf hoarypea | Tephrosia angustissima Shuttlw. ex Chapman | TEAN |
| narrowleaf hoarypea | Tephrosia angustissima Shuttlw. ex Chapman var. angustissima | TEANA |
| narrowleaf hoarypea | Tephrosia angustissima Shuttlw. ex Chapman var. corallicola (Small) Isely | TEANC |
| narrowleaf Indian breadroot | Pediomelum linearifolium (Torr. & Gray) J. Grimes | PELI10 |
| narrowleaf lespedeza | Lespedeza angustifolia (Pursh) Ell. | LEAN |
| narrowleaf lupine | Lupinus angustifolius L. | LUAN4 |
| narrowleaf milkvetch | Astragalus pectinatus (Dougl. ex Hook.) Dougl. ex G. Don | ASPE5 |
| narrowpod sensitive pea | Chamaecrista lineata (Sw.) Greene | CHLI5 |
| narrowpod sensitive pea | Chamaecrista lineata (Sw.) Greene var. brachyloba (Griseb.) Irwin & Barneby | CHLIB |
| narrowpod sensitive pea | Chamaecrista lineata (Sw.) Greene var. keyensis (Pennell) Irwin & Barneby | CHLIK |
| Natal indigo | Indigofera arrecta Hochst. ex A. Rich. | INAR2 |
| Naturita milkvetch | Astragalus naturitensis Payson | ASNA |
| nealie | Acacia rigens A. Cunn. ex G. Don | ACRI6 |
| Nebraska lupine | Lupinus plattensis S. Wats. | LUPL |
| necklacepod | Sophora L. | SOPHO |
| Needle Mountain milkvetch | Astragalus eurylobus (Barneby) Barneby | ASEU3 |
| Nelson's milkvetch | Astragalus nelsonianus Barneby | ASNE3 |
| Nelson's mimosa | Mimosa quadrivalvis L. var. nelsonii (Britt. & Rose) Barneby | MIQUN |
| neonotonia | Neonotonia Lackey | NEONO |
| Neonotonia wightii | Glycine wightii (Wight & Arn.) Verdc. | GLWI2 |
| Neonotonia wightii var. mearnsii | Glycine wightii (Wight & Arn.) Verdc. var. mearnsii (De Wild.) Verdc. | GLWIM2 |
| neorudolphia | Neorudolphia Britt. | NEORU |
| Neptunia lutea | Neptunia lutea (Leavenworth) Benth. var. multipinnatifida B.L. Turner | NELUM2 |
| Neptunia plena | Mimosa plena L. | MIPL3 |
| Neptunia prostrata | Neptunia oleracea Lour. | NEOL2 |
| Neptunia pubescens var. microcarpa | Neptunia palmeri Britt. & Rose | NEPA5 |
| Neptunia pubescens var. pubescens | Neptunia floridana Small | NEFL2 |
| Neptunia pubescens var. pubescens | Neptunia pubescens Benth. var. floridana (Small) B.L. Turner | NEPUF2 |
| Neptunia pubescens var. pubescens | Neptunia pubescens Benth. var. lindheimeri (B.L. Robins.) B.L. Turner | NEPUL |
| netleaf bundleflower | Desmanthus reticulatus Benth. | DERE3 |
| neto hoja zarzabacoa de dos hojas | Zornia reticulata Sm. | ZORE |
| Nevada bird's-foot trefoil | Lotus nevadensis (S. Wats.) Greene | LONE4 |
| Nevada bird's-foot trefoil | Lotus nevadensis (S. Wats.) Greene var. nevadensis | LONEN2 |
| Nevada dalea | Psorothamnus polydenius (Torr. ex S. Wats.) Rydb. | PSPO |
| Nevada dalea | Psorothamnus polydenius (Torr. ex S. Wats.) Rydb. var. polydenius | PSPOP |
| Nevada lupine | Lupinus nevadensis Heller | LUNE |
| Nevada milkvetch | Astragalus bisulcatus (Hook.) Gray var. nevadensis (M.E. Jones) Barneby | ASBIN |
| Nevada pea | Lathyrus lanszwertii Kellogg | LALA3 |
| Nevada pea | Lathyrus lanszwertii Kellogg var. aridus (Piper) Jepson | LALAA |
| Nevada pea | Lathyrus lanszwertii Kellogg var. leucanthus (Rydb.) Dorn | LALAL3 |
| New Holland rattlepod | Crotalaria novae-hollandiae DC. | CRNO4 |
| New Mexico bird's-foot trefoil | Lotus plebeius (Brandeg.) Barneby | LOPL2 |
| New Mexico locust | Robinia neomexicana Gray | RONE |
| New Mexico locust | Robinia neomexicana Gray var. neomexicana | RONEN |
| New Mexico lupine | Lupinus neomexicanus Greene | LUNE2 |
| New Mexico milkvetch | Astragalus neomexicanus Woot. & Standl. | ASNE4 |
| New Mexico spiny milkvetch | Astragalus kentrophyta Gray var. neomexicanus (Barneby) Barneby | ASKEN |
| New Mexico ticktrefoil | Desmodium neomexicanum Gray | DENE |
| Newberry's milkvetch | Astragalus newberryi Gray | ASNE6 |
| Newberry's milkvetch | Astragalus newberryi Gray var. aquarii Isely | ASNEA |
| Newberry's milkvetch | Astragalus newberryi Gray var. blyae (Rose ex Rydb.) Barneby | ASNEB |
| Newberry's milkvetch | Astragalus newberryi Gray var. castoreus M.E. Jones | ASNEC |
| Newberry's milkvetch | Astragalus newberryi Gray var. newberryi | ASNEN |
| nicker | Caesalpinia L. | CAESA |
| nicker bean | Entada gigas (L.) Fawcett & Rendle | ENGI |
| Niger copal tree | Daniellia thurifera Bennett | DATH6 |
| Nigerian stylo | Stylosanthes erecta Beauv. | STER2 |
| nineanther prairie clover | Dalea enneandra Nutt. | DAEN |
| Nipomo Mesa lupine | Lupinus nipomensis Eastw. | LUNI2 |
| nodding clover | Trifolium cernuum Brot. | TRCE9 |
| nodding locoweed | Oxytropis deflexa (Pallas) DC. | OXDE2 |
| nodding locoweed | Oxytropis deflexa (Pallas) DC. var. foliolosa (Hook.) Barneby | OXDEF |
| nodding locoweed | Oxytropis deflexa (Pallas) DC. var. pulcherrima Welsh & A. Huber | OXDEP2 |
| Nootka lupine | Lupinus nootkatensis Donn ex Sims | LUNO |
| Nootka lupine | Lupinus nootkatensis Donn ex Sims var. fruticosus Sims | LUNOF |
| Nootka lupine | Lupinus nootkatensis Donn ex Sims var. nootkatensis | LUNON |
| northern beantree | Bauhinia carronii F. Muell. | BACA15 |
| northern freckled milkvetch | Astragalus lentiginosus Dougl. ex Hook. var. albifolius M.E. Jones | ASLEA |
| northern sweetvetch | Hedysarum boreale Nutt. ssp. mackenziei (Richards.) Welsh | HEBOM |
| notable wattle | Acacia notabilis F. Muell. | ACNO5 |
| notched cowpea | Vigna marina (Burm. f.) Merr. | VIMA3 |
| notchleaf clover | Trifolium bifidum Gray | TRBI |
| Nuttall's milkvetch | Astragalus nuttallii (Torr. & Gray) J.T. Howell | ASNU5 |
| Nuttall's milkvetch | Astragalus nuttallii (Torr. & Gray) J.T. Howell var. nuttallii | ASNUN2 |
| Nuttall's milkvetch | Astragalus nuttallii (Torr. & Gray) J.T. Howell var. virgatus (Gray ex Brewer & S. Wats.) Barneby | ASNUV |
| Nuttall's oxytrope | Oxytropis multiceps Nutt. | OXMU |
| Nuttall's sensitive-briar | Mimosa nuttallii (DC.) B.L. Turner | MINU6 |
| Nuttall's ticktrefoil | Desmodium nuttallii (Schindl.) Schub. | DENU5 |
| Nuttall's wild indigo | Baptisia nuttalliana Small | BANU2 |
| Nutzotin milkvetch | Astragalus nutzotinensis Rouss. | ASNU6 |
| Nye milkvetch | Astragalus nyensis Barneby | ASNY2 |
| Oahu cowpea | Vigna owahuensis Vogel | VIOW |
| Oahu riverhemp | Sesbania tomentosa Hook. & Arn. | SETO3 |
| Oak Ridge lupine | Lupinus diffusus Nutt. | LUDI2 |
| oakwoods prairie clover | Dalea versicolor Zucc. | DAVE |
| oakwoods prairie clover | Dalea versicolor Zucc. ssp. versicolor | DAVEV |
| oakwoods prairie clover | Dalea versicolor Zucc. ssp. versicolor var. sessilis (Gray) Barneby | DAVES |
| obliqueseeded jackbean | Canavalia plagiosperma Piper | CAPL16 |
| Ocala vetch | Vicia ocalensis Godfrey & Kral | VIOC80 |
| oilbean tree | Pentaclethra macrophylla Benth. | PEMA20 |
| okie bean | Dipogon lignosus (L.) Verdc. | DILI8 |
| olive clover | Trifolium olivaceum Greene | TROL2 |
| olneya | Olneya Gray | OLNEY |
| oneflower clover | Trifolium uniflorum L. | TRUN5 |
| oneflower vetch | Vicia articulata Hornem. | VIAR81 |
| oneleaf senna | Senna uniflora (P. Mill.) Irwin & Barneby | SEUN3 |
| Onobrychis arenaria ssp. arenaria | Onobrychis tanaitica Spreng. | ONTA2 |
| Onobrychis arenaria ssp. sibirica | Onobrychis sibirica (Sirj.) Grossh. | ONSI2 |
| Onobrychis transcaucasica | Onobrychis antasiatica hort. | ONAN2 |
| Onobrychis viciifolia | Hedysarum onobrychis L. | HEON |
| Onobrychis viciifolia | Onobrychis sativa Lam. | ONSA |
| Onobrychis viciifolia | Onobrychis viciaefolia Scop. [orthographic variant] | ONVI3 |
| Ononis pusilla | Ononis columnae All. | ONCO |
| Ononis spinosa | Ononis campestris G. Koch & Ziz | ONCA2 |
| open clover | Trifolium apertum Bobrov | TRAP3 |
| open lupine | Lupinus vallicola Heller | LUVA2 |
| open lupine | Lupinus vallicola Heller ssp. apricus (Greene) D. Dunn | LUVAA |
| open lupine | Lupinus vallicola Heller ssp. vallicola | LUVAV |
| opposite taralea | Taralea oppositifolia Aublet | TAOP2 |
| orange wattle | Acacia saligna (Labill.) Wendl. f. | ACSA |
| orangeflower lupine | Lupinus citrinus Kellogg | LUCI |
| orangeflower lupine | Lupinus citrinus Kellogg var. citrinus | LUCIC |
| orangeflower lupine | Lupinus citrinus Kellogg var. deflexus (Congd.) Jepson | LUCID |
| Orbexilum lupinellum | Psoralea lupinella Michx. | PSLU |
| Orbexilum lupinellum | Rhytidomene lupinellus (Michx.) Rydb. | RHLU3 |
| Orbexilum macrophyllum | Psoralea macrophylla Rowlee | PSMA3 |
| Orbexilum onobrychis | Psoralea onobrychis Nutt. | PSON |
| Orbexilum pedunculatum var. pedunculatum | Hedysarum pedunculatum P. Mill. | HEPE4 |
| Orbexilum pedunculatum var. pedunculatum | Orbexilum pedunculatum (P. Mill.) Rydb. var. eglandulosum (Ell.) Isely | ORPEE |
| Orbexilum pedunculatum var. pedunculatum | Psoralea pedunculata (P. Mill.) Vail | PSPE3 |
| Orbexilum pedunculatum var. pedunculatum | Psoralea psoralioides (Walt.) Cory var. eglandulosa (Ell.) Freeman | PSPSE |
| Orbexilum pedunculatum var. psoralioides | Orbexilum gracile (Torr. & Gray) Rydb. | ORGR3 |
| Orbexilum pedunculatum var. psoralioides | Orbexilum pedunculatum (P. Mill.) Rydb. var. gracile (Torr. & Gray) J. Grimes | ORPEG |
| Orbexilum pedunculatum var. psoralioides | Psoralea psoralioides (Walt.) Cory | PSPS |
| Orbexilum pedunculatum var. psoralioides | Psoralea psoralioides (Walt.) Cory var. gracilis (Torr. & Gray) Freeman | PSPSG |
| Orbexilum simplex | Psoralea simplex Nutt. ex Torr. & Gray | PSSI |
| Orbexilum stipulatum | Psoralea stipulata Torr. & Gray | PSST2 |
| Orbexilum virgatum | Psoralea virgata Nutt. | PSVI2 |
| Orcutt's lupine | Lupinus concinnus J.G. Agardh ssp. orcuttii (S. Wats.) D. Dunn | LUCOO2 |
| Orcutt's senna | Senna orcuttii (Britt. & Rose) Irwin & Barneby | SEOR5 |
| oreganillo falso | Cynometra portoricensis Krug & Urban | CYPO2 |
| Oregon clover | Trifolium longipes Nutt. ssp. oreganum (T.J. Howell) J. Gillett | TRLOO |
| Oregon lupine | Lupinus oreganus Heller | LUOR |
| Oregon lupine | Lupinus oreganus Heller var. oreganus | LUORO |
| Oregon milkvetch | Astragalus oreganus Nutt. | ASOR2 |
| Oriental lespedeza | Lespedeza formosa (Vogel) Koehne | LEFO3 |
| ormosia | Ormosia G. Jackson | ORMOS |
| ornate lupine | Lupinus ornatus Dougl. ex Lindl. | LUOR2 |
| Ornithopus sativus ssp. isthmocarpus | Ornithopus isthmocarpus Coss. | ORIS80 |
| Ornithopus sativus ssp. isthmocarpus | Ornithopus roseus Dufour | ORRO2 |
| Ornithopus sativus ssp. isthmocarpus | Ornithopus sativus Brot. ssp. roseus (Dufour) Alsina | ORSAR |
| Osgood Mountain milkvetch | Astragalus yoder-williamsii Barneby | ASYO |
| Osterhout's lupine | Lupinus hillii Greene var. osterhoutianus (C.P. Sm.) Harmon | LUHIO |
| Otholobium candicans | Psoralea candicans Eckl. & Zeyh. | PSCA12 |
| Otholobium fruticans | Psoralea bracteata P. J. Bergius, nom. illeg. [anomalous] | PSBR9 |
| Otholobium fruticans | Psoralea fruticans (L.) Druce | PSFR6 |
| Otholobium fruticans | Trifolium fruticans L. | TRFR5 |
| Ottley's bird's-foot trefoil | Lotus stipularis (Benth.) Greene var. ottleyi Isely | LOSTO |
| Ouachita false indigo | Amorpha ouachitensis Wilbur | AMOU |
| owl-head clover | Trifolium alpestre L. | TRAL10 |
| Owyhee clover | Trifolium owyheense Gilkey | TROW |
| Owyhee milkvetch | Astragalus atratus S. Wats. var. owyheensis (A. Nels. & J.F. Macbr.) M.E. Jones | ASATO |
| oxeye bean | Mucuna urens (L.) Medik. | MUUR |
| Oxus locoweed | Oxytropis riparia Litv. | OXRI80 |
| oxyrhynchus | Oxyrhynchus Brandeg. | OXYRH |
| Oxytropis arctica var. arctica | Oxytropis coronaminis Fern. | OXCO12 |
| Oxytropis arctica var. barnebyana | Oxytropis campestris (L.) DC. ssp. sordida (Willd.) C. Hartm. | OXCAS2 |
| Oxytropis arctica var. barnebyana | Oxytropis sordida (Willd.) Pers. ssp. barnebyana (Welsh) Yurtsev | OXSOB |
| Oxytropis arctica var. barnebyana | Oxytropis sordida auct. non (Willd.) Pers. p.p. [misapplied] | OXSO |
| Oxytropis arctica var. koyukukensis | Oxytropis koyukukensis Porsild | OXKO3 |
| Oxytropis besseyi var. argophylla | Aragallus argophyllus Rydb. | ARAR19 |
| Oxytropis besseyi var. argophylla | Oxytropis nana Nutt. var. argophylla (Rydb.) Isely | OXNAA |
| Oxytropis besseyi var. besseyi | Aragallus besseyi Rydb. | ARBE5 |
| Oxytropis besseyi var. besseyi | Oxytropis nana Nutt. var. besseyi (Rydb.) Isely | OXNAB |
| Oxytropis besseyi var. fallax | Oxytropis nana Nutt. var. fallax (Barneby) Isely | OXNAF |
| Oxytropis besseyi var. obnapiformis | Oxytropis nana Nutt. var. obnapiformis (C.L. Porter) Isely | OXNAO |
| Oxytropis besseyi var. obnapiformis | Oxytropis obnapiformis C.L. Porter | OXOB2 |
| Oxytropis besseyi var. salmonensis | Oxytropis nana Nutt. var. salmonensis (Barneby) Isely | OXNAS |
| Oxytropis besseyi var. ventosa | Aragallus ventosus Greene | ARVE4 |
| Oxytropis besseyi var. ventosa | Oxytropis nana Nutt. var. ventosa (Greene) Isely | OXNAV |
| Oxytropis borealis var. borealis | Oxytropis glutinosa Porsilid | OXGL6 |
| Oxytropis borealis var. borealis | Oxytropis uralensis C.A. Mey. var. subsucculenta Hook. | OXURS |
| Oxytropis borealis var. borealis | Oxytropis viscida Nutt. var. subsucculenta (Hook.) Barneby | OXVIS |
| Oxytropis borealis var. sulphurea | Oxytropis sheldonensis Porsild | OXSH |
| Oxytropis borealis var. sulphurea | Oxytropis verruculosa Porsild | OXVE |
| Oxytropis borealis var. sulphurea | Oxytropis viscidula Tidestrom ssp. sulphurea Porsild | OXVIS2 |
| Oxytropis borealis var. viscida | Aragallus viscidulus Rydb. | ARVI11 |
| Oxytropis borealis var. viscida | Aragallus viscidulus Rydb. var. depressus Rydb. | ARVID |
| Oxytropis borealis var. viscida | Oxytropis gaspensis Fern. & Kelsey | OXGA |
| Oxytropis borealis var. viscida | Oxytropis ixodes Butters & Abbe | OXIX |
| Oxytropis borealis var. viscida | Oxytropis leucantha (Pallas) Pers. var. depressus (Rydb.) Boivin | OXLED |
| Oxytropis borealis var. viscida | Oxytropis leucantha (Pallas) Pers. var. gaspensis (Fern. & Kelsey) Boivin | OXLEG |
| Oxytropis borealis var. viscida | Oxytropis leucantha (Pallas) Pers. var. ixodes (Butters & Abbe) Boivin | OXLEI |
| Oxytropis borealis var. viscida | Oxytropis leucantha (Pallas) Pers. var. magnifica Boivin | OXLEM |
| Oxytropis borealis var. viscida | Oxytropis leucantha (Pallas) Pers. var. viscida (Nutt.) Boivin | OXLEV |
| Oxytropis borealis var. viscida | Oxytropis viscida Nutt. | OXVI2 |
| Oxytropis campestris var. chartacea | Oxytropis chartacea Fassett | OXCH |
| Oxytropis campestris var. columbiana | Oxytropis columbiana St. John | OXCO13 |
| Oxytropis campestris var. cusickii | Oxytropis alpicola (Rydb.) M.E. Jones | OXAL5 |
| Oxytropis campestris var. cusickii | Oxytropis campestris (L.) DC. var. rydbergii (A. Nels.) R.J. Davis | OXCAR |
| Oxytropis campestris var. cusickii | Oxytropis cusickii Greenm. | OXCU3 |
| Oxytropis campestris var. cusickii | Oxytropis rydbergii A. Nels. | OXRY |
| Oxytropis campestris var. dispar | Oxytropis dispar (A. Nels.) K. Schum. | OXDI4 |
| Oxytropis campestris var. dispar | Oxytropis monticola Gray ssp. dispar (A. Nels.) Elisens & Packer | OXMOD |
| Oxytropis campestris var. johannensis | Oxytropis johannensis (Fern.) Heller | OXJO3 |
| Oxytropis campestris var. jordalii | Oxytropis campestris (L.) DC. ssp. jordalii (Porsild) Hult | OXCAJ2 |
| Oxytropis campestris var. jordalii | Oxytropis jordalii Porsild | OXJO2 |
| Oxytropis campestris var. roaldii | Oxytropis campestris (L.) DC. ssp. roaldii (Ostenf.) Cody | OXCAR2 |
| Oxytropis campestris var. roaldii | Oxytropis roaldii Ostenf. | OXRO3 |
| Oxytropis campestris var. spicata | Oxytropis macounii (Greene) Rydb. | OXMA4 |
| Oxytropis campestris var. spicata | Oxytropis sericea Nutt. ssp. spicata (Hook.) Cody | OXSES3 |
| Oxytropis campestris var. spicata | Oxytropis sericea Nutt. var. spicata (Hook.) Barneby | OXSES8 |
| Oxytropis campestris var. spicata | Oxytropis spicata (Hook.) Standl. | OXSP2 |
| Oxytropis campestris var. varians | Oxytropis campestris (L.) DC. ssp. varians (Rydb.) Cody | OXCAV2 |
| Oxytropis campestris var. varians | Oxytropis hyperborea Porsild | OXHY |
| Oxytropis campestris var. varians | Oxytropis tananensis Yurtzev | OXTA |
| Oxytropis campestris var. varians | Oxytropis varians (Rydb.) K. Schum. | OXVA |
| Oxytropis deflexa var. foliolosa | Oxytropis deflexa (Pallas) DC. ssp. foliolosa (Hook.) Cody | OXDEF2 |
| Oxytropis deflexa var. foliolosa | Oxytropis deflexa (Pallas) DC. var. capitata Boivin | OXDEC2 |
| Oxytropis deflexa var. foliolosa | Oxytropis deflexa auct. non (Pallas) DC. p.p. [misapplied] | OXDE6 |
| Oxytropis deflexa var. foliolosa | Oxytropis foliolosa Hook. | OXFO3 |
| Oxytropis deflexa var. sericea | Oxytropis deflexa (Pallas) DC. ssp. sericea (Torr. & Gray) Cody | OXDES2 |
| Oxytropis deflexa var. sericea | Oxytropis deflexa (Pallas) DC. var. parviflora Boivin | OXDEP |
| Oxytropis lagopus var. atropurpurea | Aragallus atropurpureus Rydb. | ARAT4 |
| Oxytropis lagopus var. lagopus | Spiesia lagopus (Nutt.) Kuntze | SPLA7 |
| Oxytropis lambertii var. articulata | Aragallus articulatus Greene | ARAR18 |
| Oxytropis lambertii var. bigelovii | Oxytropis lambertii Pursh ssp. bigelovii (Gray) W.A. Weber | OXLAB2 |
| Oxytropis lambertii var. bigelovii | Oxytropis patens (Rydb.) A. Nels. | OXPA5 |
| Oxytropis lambertii var. lambertii | Oxytropis involuta (A. Nels.) K. Schum. | OXIN4 |
| Oxytropis maydelliana | Oxytropis campestris (L.) DC. ssp. melanocephala Hook. | OXCAM |
| Oxytropis maydelliana | Oxytropis campestris (L.) DC. var. glabrata Hook. | OXCAG2 |
| Oxytropis maydelliana | Oxytropis glabrata (Hook.) A. Nels. | OXGL5 |
| Oxytropis maydelliana | Oxytropis maydelliana Trautv. ssp. melanocephala (Hook.) Porsild | OXMAM |
| Oxytropis monticola | Oxytropis campestris (L.) DC. ssp. gracilis (A. Nels.) Hult | OXCAG4 |
| Oxytropis monticola | Oxytropis campestris (L.) DC. var. cervinus (Greene) Boivin | OXCAC4 |
| Oxytropis monticola | Oxytropis campestris (L.) DC. var. gracilis (A. Nels.) Barneby | OXCAG |
| Oxytropis monticola | Oxytropis gracilis (A. Nels.) K. Schum. | OXGR3 |
| Oxytropis monticola | Oxytropis luteola (Greene) Piper & Beattie | OXLU3 |
| Oxytropis monticola | Oxytropis villosa (Rydb.) K. Schum. | OXVI3 |
| Oxytropis nana | Oxytropis nana Nutt. var. nana Nutt. [superfluous autonym] | OXNAN2 |
| Oxytropis nigrescens var. nigrescens | Oxytropis bryophila Jurtzev | OXBR2 |
| Oxytropis nigrescens var. nigrescens | Oxytropis glaberrima Hult | OXGL2 |
| Oxytropis nigrescens var. nigrescens | Oxytropis gorodkovii Jurtzev | OXGO |
| Oxytropis nigrescens var. nigrescens | Oxytropis nigrescens (Pallas) Fisch. ex DC. ssp. bryophila (Greene) Hult | OXNIB |
| Oxytropis nigrescens var. nigrescens | Oxytropis nigrescens (Pallas) Fisch. ex DC. ssp. pygmaea (Pallas) Hult | OXNIP |
| Oxytropis nigrescens var. nigrescens | Oxytropis pygmaea (Pallas) Fern. | OXPY |
| Oxytropis oreophila var. jonesii | Oxytropis jonesii Barneby | OXJO |
| Oxytropis oreophila var. oreophila | Aragallus oreophilus (Gray) A. Nels. | AROR3 |
| Oxytropis oreophila var. oreophila | Spiesia oreophila (Gray) Kuntze | SPOR3 |
| Oxytropis podocarpa | Oxytropis podocarpa Gray var. inflata (Hook.) Boivin | OXPOI |
| Oxytropis sericea var. sericea | Oxytropis pinetorum (Heller) K. Schum. | OXPI3 |
| Oxytropis splendens | Aragallus splendens (Dougl. ex Hook.) Greene | ARSP9 |
| Oxytropis splendens | Astragalus splendens (Dougl. ex Hook.) Tidestrom | ASSP15 |
| Oxytropis splendens | Oxytropis richardsonii (Hook.) K. Schum. | OXRI2 |
| Oxytropis splendens | Oxytropis splendens Dougl. ex Hook. var. richardsonii Hook. | OXSPR |
| Oxytropis splendens | Oxytropis splendens Dougl. ex Hook. var. vestita Hook. | OXSPV |
| Ozark milkvetch | Astragalus distortus Torr. & Gray | ASDI4 |
| Ozark milkvetch | Astragalus distortus Torr. & Gray var. distortus | ASDID3 |
| pacara earpod tree | Enterolobium contortisiliquum (Vell.) Morong | ENCO2 |
| pachyrhizus | Pachyrhizus L.C. Rich. ex DC. | PACHY2 |
| Pachyrhizus erosus | Cacara erosa (L.) Kuntze | CAER4 |
| Pachyrhizus erosus | Pachyrhizus angulatus Rich. ex DC. | PAAN16 |
| Pachyrhizus erosus | Pachyrhizus bulbosus (L.) Kurz | PABU4 |
| Pacific lupine | Lupinus lepidus Dougl. ex Lindl. | LULE2 |
| Pacific pea | Lathyrus vestitus Nutt. | LAVE2 |
| Pacific pea | Lathyrus vestitus Nutt. ssp. laetiflorus (Greene) Broich | LAVEL |
| Pacific pea | Lathyrus vestitus Nutt. ssp. laevicarpus Broich | LAVEL2 |
| Pacific pea | Lathyrus vestitus Nutt. ssp. vestitus | LAVEV |
| Packard's milkvetch | Astragalus cusickii Gray var. packardiae Barneby | ASCUP |
| pagumpa milkvetch | Astragalus ensiformis M.E. Jones | ASEN4 |
| pagumpa milkvetch | Astragalus ensiformis M.E. Jones var. ensiformis | ASENE |
| pagumpa milkvetch | Astragalus ensiformis M.E. Jones var. gracilior Barneby | ASENG |
| pahuen | Adesmia microphylla Hook. & Arn. | ADMI2 |
| painted desert milkvetch | Astragalus sophoroides M.E. Jones | ASSO4 |
| painted milkvetch | Astragalus ceramicus Sheldon | ASCE |
| painted milkvetch | Astragalus ceramicus Sheldon var. apus Barneby | ASCEA |
| painted milkvetch | Astragalus ceramicus Sheldon var. ceramicus | ASCEC |
| painted milkvetch | Astragalus ceramicus Sheldon var. filifolius (Gray) F.J. Herm. | ASCEF |
| pale cologania | Cologania pallida Rose | COPA4 |
| pale desert lupine | Lupinus pallidus Brandeg. | LUPA7 |
| pale yellow lupine | Lupinus luteolus Kellogg | LULU2 |
| pale-flower vetch | Vicia pisiformis L. | VIPI5 |
| Palestine clover | Trifolium palaestinum Boiss. | TRPA19 |
| Palestine clover | Trifolium philistaeum Zohary | TRPH4 |
| Palmer's clover | Trifolium gracilentum Torr. & Gray var. palmeri (S. Wats.) McDermott | TRGRP |
| Palmer's milkvetch | Astragalus palmeri Gray | ASPA10 |
| palmleaf Indian breadroot | Pediomelum digitatum (Nutt. ex Torr. & Gray) Isely | PEDI9 |
| palo blanco | Lysiloma candidum Brandegee | LYCA7 |
| palo de hoz | Machaerium lunatum (L. f.) Ducke | MALU2 |
| Palouse milkvetch | Astragalus arrectus Gray | ASAR7 |
| paloverde | Parkinsonia L. | PARKI2 |
| Panamint milkvetch | Astragalus panamintensis Sheldon | ASPA11 |
| Panamint Mountain lupine | Lupinus magnificus M.E. Jones | LUMA |
| Panamint Mountain lupine | Lupinus magnificus M.E. Jones var. glarecola M.E. Jones | LUMAG |
| Panamint Mountain lupine | Lupinus magnificus M.E. Jones var. hesperius (Heller) C.P. Sm. | LUMAH |
| Panamint Mountain lupine | Lupinus magnificus M.E. Jones var. magnificus | LUMAM |
| panicled false indigo | Amorpha paniculata Torr. & Gray | AMPA4 |
| panicledleaf ticktrefoil | Desmodium paniculatum (L.) DC. | DEPA6 |
| panicledleaf ticktrefoil | Desmodium paniculatum (L.) DC. var. epetiolatum Schub. | DEPAE |
| panicledleaf ticktrefoil | Desmodium paniculatum (L.) DC. var. paniculatum | DEPAP2 |
| pannicle jointvetch | Aeschynomene paniculata Willd. ex Vogel | AEPA3 |
| panther milkvetch | Astragalus pardalinus (Rydb.) Barneby | ASPA12 |
| papagayo | Sesbania sericea (Willd.) Link | SESE7 |
| paperbark-thorn | Acacia sieberiana DC. var. woodii (Burtt Davy) Keay & Brenan | ACSIW2 |
| paradox acacia | Acacia paradoxa DC. | ACPA8 |
| Paradox lupine | Lupinus crassus Payson | LUCR2 |
| Paradox milkvetch | Astragalus holmgreniorum Barneby | ASHO5 |
| paraserianthes | Paraserianthes I. Nielsen | PARAS |
| Paraserianthes lophantha | Albizia distachya J.F. Macbr. | ALDI7 |
| Paraserianthes lophantha | Albizia lophantha (Willd.) Benth. | ALLO |
| Paraserianthes lophantha ssp. montana | Albizia montana (Jungh.) Benth. | ALMO14 |
| parasol clover | Trifolium bolanderi Gray | TRBO3 |
| Paria River Indian breadroot | Pediomelum pariense (Welsh & Atwood) J. Grimes | PEPA41 |
| Parish's California tea | Rupertia rigida (Parish) J. Grimes | RURI2 |
| Parish's milkvetch | Astragalus douglasii (Torr. & Gray) Gray var. parishii (Gray) M.E. Jones | ASDOP |
| park milkvetch | Astragalus leptaleus Gray | ASLE9 |
| parkia | Parkia R. Br. | PARKI3 |
| parkia | Parkia speciosa Hassk. | PASP15 |
| Parkia clappertoniana | Parkia africana R. Br. | PAAF2 |
| Parkia timoriana | Parkia roxburghii G. Don | PARO11 |
| Parkinsonia florida | Cercidium floridum Benth. ex Gray | CEFL6 |
| Parkinsonia florida | Cercidium floridum Gray ssp. floridum Gray [superfluous autonym] | CEFLF2 |
| Parkinsonia microphylla | Cercidium microphyllum (Torr.) Rose & I.M. Johnston | CEMI6 |
| Parkinsonia texana var. macra | Cercidium macrum I.M. Johnston | CEMA12 |
| Parkinsonia texana var. texana | Cercidium texanum Gray | CETE8 |
| Parry's clover | Trifolium parryi Gray | TRPA5 |
| Parry's clover | Trifolium parryi Gray ssp. montanense (Rydb.) J. Gillett | TRPAM |
| Parry's clover | Trifolium parryi Gray ssp. parryi | TRPAP |
| Parry's clover | Trifolium parryi Gray ssp. salictorum (Greene ex Rydb.) J. Gillett | TRPAS |
| Parry's false prairie-clover | Marina parryi (Torr. & Gray) Barneby | MAPA7 |
| Parry's holdback | Pomaria melanosticta S. Schauer | POME16 |
| Parry's milkvetch | Astragalus parryi Gray | ASPA13 |
| Parry's oxytrope | Oxytropis parryi Gray | OXPA2 |
| parryella | Parryella Torr. & Gray ex Gray | PARRY2 |
| partridge pea | Chamaecrista fasciculata (Michx.) Greene | CHFA2 |
| partridge pea | Chamaecrista fasciculata (Michx.) Greene var. fasciculata | CHFAF |
| partridge pea | Chamaecrista fasciculata (Michx.) Greene var. macrosperma (Fern.) C.F. Reed | CHFAM2 |
| Patterson's milkvetch | Astragalus pattersonii Gray ex Brandeg. | ASPA14 |
| pauper milkvetch | Astragalus misellus S. Wats. | ASMI8 |
| pauper milkvetch | Astragalus misellus S. Wats. var. misellus | ASMIM3 |
| pauper milkvetch | Astragalus misellus S. Wats. var. pauper Barneby | ASMIP |
| Payson's milkvetch | Astragalus paysonii (Rydb.) Barneby | ASPA16 |
| pea | Lathyrus L. | LATHY |
| pea | Pisum L. | PISUM |
| peacocksplume | Falcataria (Nielsen) Barneby & Grimes | FALCA2 |
| peacocksplume | Falcataria moluccana (Miquel) Barneby & Grimes | FAMO |
| peanut | Arachis hypogaea L. | ARHY |
| peanut | Arachis L. | ARACH |
| peanut | Arachis monticola Krapov. & Rig. | ARMO9 |
| peanut clover | Trifolium polymorphum Poir. | TRPO6 |
| pearl wattle | Acacia podalyriifolia A. Cunningham ex G. Don | ACPO2 |
| peashrub | Caragana Fabr. | CARAG |
| peashrub | Caragana korshinskii Kom. | CAKO6 |
| Peck's milkvetch | Astragalus peckii Piper | ASPE4 |
| Pediomelum argophyllum | Psoralea argophylla Pursh | PSAR2 |
| Pediomelum argophyllum | Psoralea collina Rydb. | PSCO5 |
| Pediomelum argophyllum | Psoralidium argophyllum (Pursh) Rydb. | PSAR5 |
| Pediomelum aromaticum | Pediomelum aromaticum (Payson) W.A. Weber var. barnebyi Welsh | PEARB |
| Pediomelum aromaticum | Pediomelum aromaticum (Payson) W.A. Weber var. tuhyi Welsh | PEART |
| Pediomelum aromaticum | Psoralea aromatica Payson | PSAR3 |
| Pediomelum californicum | Psoralea californica S. Wats. | PSCA2 |
| Pediomelum canescens | Psoralea canescens Michx. | PSCA3 |
| Pediomelum castoreum | Psoralea castorea S. Wats. | PSCA4 |
| Pediomelum cuspidatum | Psoralea cuspidata Pursh | PSCU |
| Pediomelum cyphocalyx | Psoralea cyphocalyx Gray | PSCY |
| Pediomelum digitatum | Pediomelum digitatum (Nutt. ex Torr. & Gray) Isely var. parvifolium (Shinners) Gandhi & L.E. Brown | PEDIP |
| Pediomelum digitatum | Psoralea digitata Nutt. ex Torr. & Gray | PSDI |
| Pediomelum digitatum | Psoralea digitata Nutt. ex Torr. & Gray var. parvifolia Shinners | PSDIP |
| Pediomelum digitatum | Psoralidium digitatum (Nutt.) Rydb. | PSDI4 |
| Pediomelum esculentum | Psoralea esculenta Pursh | PSES |
| Pediomelum humile | Psoralea humilis (Rydb.) J.F. Macbr. | PSHU |
| Pediomelum humile | Psoralea rydbergii Cory | PSRY |
| Pediomelum hypogaeum var. hypogaeum | Psoralea hypogaea Nutt. ex Torr. & Gray | PSHY |
| Pediomelum hypogaeum var. hypogaeum | Psoralea scaposa (Gray) J.F. Macbr. var. breviscapa Shinners | PSSCB |
| Pediomelum hypogaeum var. scaposum | Pediomelum goughiae Tharp & Barkl. | PEGO3 |
| Pediomelum hypogaeum var. scaposum | Pediomelum pentaphyllum (L.) Rydb. var. scaposum (Gray) J. Grimes | PEPES |
| Pediomelum hypogaeum var. scaposum | Psoralea hypogaea Nutt. ex Torr. & Gray ssp. scaposa (Gray) D.J. Ockendon | PSHYS2 |
| Pediomelum hypogaeum var. scaposum | Psoralea hypogaea Nutt. ex Torr. & Gray var. scaposa Gray | PSHYS |
| Pediomelum hypogaeum var. scaposum | Psoralea scaposa (Gray) J.F. Macbr. | PSSC8 |
| Pediomelum hypogaeum var. subulatum | Pediomelum subulatum (Bush) Rydb. | PESU11 |
| Pediomelum hypogaeum var. subulatum | Psoralea subulata Bush | PSSU |
| Pediomelum hypogaeum var. subulatum | Psoralea subulata Bush var. minor Shinners | PSSUM |
| Pediomelum latestipulatum var. appressum | Psoralea latestipulata Shinners var. appressa D.J. Ockendon | PSLAA |
| Pediomelum latestipulatum var. latestipulatum | Psoralea latestipulata Shinners | PSLA2 |
| Pediomelum linearifolium | Psoralea linearifolia Torr. & Gray | PSLI |
| Pediomelum linearifolium | Psoralidium linearifolium (Torr. & Gray) Rydb. | PSLI4 |
| Pediomelum linearifolium | Psoralidium linearifolium (Torr. & Gray) Rydb. var. palodurense Tharp & Barkl. | PSLIP |
| Pediomelum linearifolium | Psoralidium linearifolium (Torr. & Gray) Rydb. var. texense Tharp & Barkl. | PSLIT |
| Pediomelum megalanthum var. epipsilum | Pediomelum epipsilum (Barneby) Welsh | PEEP |
| Pediomelum megalanthum var. epipsilum | Psoralea epipsila Barneby | PSEP |
| Pediomelum megalanthum var. megalanthum | Psoralea megalantha Woot. & Standl. | PSME2 |
| Pediomelum megalanthum var. retrorsum | Psoralea mephitica S. Wats. var. retrorsa (Rydb.) Kearney & Peebles | PSMER2 |
| Pediomelum mephiticum | Psoralea mephitica S. Wats. | PSME3 |
| Pediomelum pariense | Psoralea pariensis Welsh & Atwood | PSPA |
| Pediomelum pentaphyllum | Pediomelum trinervatum Rydb. | PETR8 |
| Pediomelum pentaphyllum | Psoralea pentaphylla L. | PSPE4 |
| Pediomelum pentaphyllum | Psoralea trinervata (Rydb.) Standl. | PSTR |
| Pediomelum reverchonii | Psoralea reverchonii S. Wats. | PSRE |
| Pediomelum rhombifolium | Pediomelum brachypus Rydb. | PEBR16 |
| Pediomelum rhombifolium | Pediomelum coryi Tharp & Barkl. | PECO21 |
| Pediomelum rhombifolium | Psoralea brachypus (Rydb.) Standl. | PSBR6 |
| Pediomelum rhombifolium | Psoralea rhombifolia Torr. & Gray | PSRH |
| Pediomelum subacaule | Psoralea subacaulis Torr. & Gray | PSSU3 |
| Peirson's milkvetch | Astragalus magdalenae Greene var. peirsonii (Munz & McBurney) Barneby | ASMAP |
| peltophorum | Peltophorum (T. Vogel) Benth. | PELTO |
| peltophorum | Peltophorum pterocarpum (DC.) Backer ex K. Heyne | PEPT3 |
| Peltophorum pterocarpum | Peltophorum inerme (Roxb.) Llanos ex Fernandez-Vill. | PEIN13 |
| Peltophorum pterocarpum | Peltophorum inermis (Roxb.) Naves ex Vill. [orthographic variant] | PEIN10 |
| Peltophorum pterocarpum | Peltophorum pterocarpa (DC.) Backer ex K. Heyne [orthographic variant] | PEPT |
| pencilflower | Stylosanthes scabra Vog. | STSC8 |
| pencilflower | Stylosanthes subsericea Blake | STSU6 |
| pencilflower | Stylosanthes Sw. | STYLO4 |
| pentaclethra | Pentaclethra Benth. | PENTA9 |
| perennial horsegram | Macrotyloma axillare (E. Meyer) Verdc. | MAAX2 |
| perennial horsegram | Macrotyloma axillare (E. Meyer) Verdc. var. axillare | MAAXA |
| perennial pea | Lathyrus latifolius L. | LALA4 |
| perennial soybean | Neonotonia wightii (Wight & Arn.) Lackey | NEWI2 |
| peronia | Ormosia krugii Urban | ORKR |
| perplexed ticktrefoil | Desmodium perplexum Schub. | DEPE80 |
| peteria | Peteria Gray | PETER |
| Peteria thompsoniae | Peteria nevadensis Tidestrom | PENE7 |
| petite flamboyant bauhinia | Bauhinia multinervia (Kunth) DC. | BAMU3 |
| Phaseolus angustissimus | Phaseolus angustissimus Gray var. latus M.E. Jones | PHANL |
| Phaseolus coccineus | Phaseolus multiflorus Lam. | PHMU7 |
| Phaseolus filiformis | Phaseolus wrightii Gray | PHWR |
| Phaseolus lunatus | Phaseolus inamoenus L. | PHIN27 |
| Phaseolus lunatus | Phaseolus limensis Macfad. | PHLI6 |
| Phaseolus lunatus | Phaseolus lunatus L. var. lunonanus Bailey | PHLUL |
| Phaseolus lunatus | Phaseolus tunkinensis Lour. | PHTU6 |
| Phaseolus maculatus | Phaseolus metcalfei Woot. & Standl. | PHME |
| Phaseolus pedicellatus var. grayanus | Phaseolus grayanus Woot. & Standl. | PHGR4 |
| Phaseolus polystachios var. polystachios | Phaseolus polystachios (L.) B.S.P. var. aquilonius Fern. | PHPOA |
| Phaseolus polystachios var. polystachios | Phaseolus smilacifolius Pollard | PHSM |
| Phaseolus polystachios var. sinuatus | Phaseolus sinuatus (Nutt. ex Torr. & Gray) Torr. & Gray | PHSI2 |
| Phaseolus vulgaris | Phaseolus vulgaris L. var. humilis Alef. | PHVUH |
| Philippine pigeonwings | Clitoria fairchildiana Howard | CLFA5 |
| physostigma | Physostigma Balf. | PHYSO4 |
| Picabo milkvetch | Astragalus oniciformis Barneby | ASON2 |
| Pickeringia montana var. tomentosa | Pickeringia montana Nutt. ex Torr. & Gray ssp. tomentosa (Abrams) Abrams | PIMOT |
| pictetia | Pictetia DC. | PICTE |
| piedmont leather-root | Orbexilum lupinellum (Michx.) Isely | ORLU3 |
| pigeon bundleflower | Desmanthus pernambucanus (L.) Thellung | DEPE4 |
| pigeonpea | Cajanus cajan (L.) Millsp. | CACA27 |
| pigeonwings | Clitoria L. | CLITO |
| pine barren ticktrefoil | Desmodium strictum (Pursh) DC. | DEST2 |
| Pine Valley milkvetch | Astragalus straturensis M.E. Jones | ASST5 |
| pineforest prairie clover | Dalea urceolata Greene | DAUR |
| pineland butterfly pea | Centrosema arenicola (Small) F.J. Herm. | CEAR5 |
| pineland hoarypea | Tephrosia mohrii (Rydb.) Godfrey | TEMO3 |
| pineland leather-root | Orbexilum virgatum (Nutt.) Rydb. | ORVI |
| pineland milkpea | Galactia pinetorum Small | GAPI3 |
| pineland wattle | Acacia pinetorum F.J. Herm. | ACPI |
| pineland wild indigo | Baptisia lecontei Torr. & Gray | BALE4 |
| pinelands snoutbean | Rhynchosia lewtonii (Vail) K. Schum. | RHLE |
| pink fuzzybean | Strophostyles umbellata (Muhl. ex Willd.) Britt. | STUM2 |
| pink shower | Cassia grandis L. f. | CAGR11 |
| pinkglobe prairie clover | Dalea tenuis (Coult.) Shinners | DATE6 |
| Pinos Altos Mountain bean | Phaseolus parvulus Greene | PHPA7 |
| pinpoint clover | Trifolium gracilentum Torr. & Gray | TRGR2 |
| pinpoint clover | Trifolium gracilentum Torr. & Gray var. gracilentum | TRGRG |
| pinto peanut | Arachis pintoi Krapov. & W. C. Greg. | ARPI8 |
| pinyon lupine | Lupinus volutans Greene | LUVO2 |
| pinyon milkvetch | Astragalus pinonis M.E. Jones | ASPI4 |
| pinyon milkvetch | Astragalus pinonis M.E. Jones var. pinonis | ASPIP4 |
| piscidia | Piscidia L. | PISCI |
| Piscidia piscipula | Ichthyomethia piscipula (L.) A.S. Hitchc. ex Sarg. | ICPI |
| Piscidia piscipula | Piscidia erythrina L. | PIER |
| Pisum sativum | Pisum arvense L. | PIAR6 |
| Pisum sativum | Pisum humile Boiss. & Noe | PIHU2 |
| Pisum sativum | Pisum sativum L. ssp. arvense (L.) Poiret | PISAA2 |
| Pisum sativum | Pisum sativum L. var. arvense (L.) Poir. | PISAA8 |
| Pisum sativum | Pisum sativum L. var. humile Poir. | PISAH |
| Pisum sativum | Pisum sativum L. var. macrocarpon Ser. | PISAM |
| Pithecellobium keyense | Pithecellobium guadalupense (Pers.) Chapman | PIGU2 |
| plains milkvetch | Astragalus gilviflorus Sheldon | ASGI5 |
| plains milkvetch | Astragalus gilviflorus Sheldon var. gilviflorus | ASGIG |
| plains milkvetch | Astragalus gilviflorus Sheldon var. purpureus Dorn | ASGIP |
| plateau milkvetch | Astragalus serpens M.E. Jones | ASSE6 |
| Platte River milkvetch | Astragalus plattensis Nutt. | ASPL2 |
| Plumas lupine | Lupinus onustus S. Wats. | LUON |
| plume albizia | Paraserianthes lophantha (Willd.) I. C. Nielsen ssp. montana (Jungh.) I. C. Nielsen | PALOM |
| plume albizia | Paraserianthes lophantha (Willd.) I. Nielsen | PALO8 |
| plumed clover | Trifolium plumosum Dougl. ex Hook. | TRPL2 |
| plumed clover | Trifolium plumosum Dougl. ex Hook. ssp. plumosum | TRPLP |
| Plummer's clover | Trifolium gymnocarpon Nutt. ssp. plummerae (S. Wats.) J. Gillett | TRGYP2 |
| pod mahogany | Afzelia quanzensis Welw. | AFQU |
| Pohil's milkvetch | Astragalus lentiginosus Dougl. ex Hook. var. pohlii Welsh & Barneby | ASLEP5 |
| Point reyes lupine | Lupinus punto-reyesensis C.P. Sm. | LUPU2 |
| pointedleaf ticktrefoil | Desmodium glutinosum (Muhl. ex Willd.) Wood | DEGL5 |
| poisonbean | Sesbania drummondii (Rydb.) Cory | SEDR |
| Poitea florida | Sabinea florida (Vahl) DC. | SAFL7 |
| Poitea paucifolia | Corynella paucifolia DC. | COPA15 |
| Poitea punicea | Sabinea punicea Urban | SAPU7 |
| polar milkvetch | Astragalus polaris Benth. | ASPO |
| Pomaria brachycarpa | Caesalpinia brachycarpa (Gray) Fisher | CABR20 |
| Pomaria brachycarpa | Hoffmannseggia brachycarpa Gray | HOBR4 |
| Pomaria jamesii | Caesalpinia jamesii (Torr. & Gray) Fisher | CAJA6 |
| Pomaria jamesii | Hoffmannseggia jamesii Torr. & Gray | HOJA3 |
| Pomaria melanosticta | Caesalpinia parryi (Fisher) Eifert | CAPA33 |
| Pomaria melanosticta | Hoffmannseggia parryi (Fisher) B.L. Turner | HOPA7 |
| Pomona milkvetch | Astragalus pomonensis M.E. Jones | ASPO2 |
| Pond's Mojave lupine | Lupinus sparsiflorus Benth. ssp. pondii (Greene) Dziekanowski & D. Dunn | LUSPP |
| pongame oiltree | Millettia pinnata (L.) Panigrahi | MIPI9 |
| poorman's friend | Stylosanthes viscosa (L.) Sw. | STVI5 |
| poponax | Acacia tortuosa (L.) Willd. | ACTO |
| porcupine jointvetch | Aeschynomene histrix Poir. | AEHI2 |
| porcupine jointvetch | Aeschynomene histrix Poir. var. incana (Vogel) Benth. | AEHII |
| porcupine mimosa | Mimosa hystricina (Small ex Britt. & Rose) B.L. Turner | MIHY2 |
| porknut | Acacia macracantha Humb. & Bonpl. ex Willd. | ACMA |
| Port Royal senna | Senna italica P. Mill. | SEIT2 |
| powderpuff | Mimosa strigillosa Torr. & Gray | MIST2 |
| powdery milkvetch | Astragalus cerussatus Sheldon | ASCE2 |
| prairie acacia | Acacia angustissima (P. Mill.) Kuntze | ACAN |
| prairie acacia | Acacia angustissima (P. Mill.) Kuntze var. hirta (Nutt.) B.L. Robins. | ACANH |
| prairie acacia | Acacia angustissima (P. Mill.) Kuntze var. suffrutescens (Rose) Isely | ACANS2 |
| prairie clover | Dalea L. | DALEA |
| prairie lespedeza | Lespedeza leptostachya Engelm. | LELE5 |
| prairie milkvetch | Astragalus laxmannii Jacq. var. robustior (Hook.) Barneby & Welsh | ASLAR |
| prairie snoutbean | Rhynchosia latifolia Nutt. ex Torr. & Gray | RHLA5 |
| prairie thermopsis | Thermopsis rhombifolia (Nutt. ex Pursh) Nutt. ex Richards. | THRH |
| prairie wattle | Acacia angustissima (P. Mill.) Kuntze var. texensis (Torr. & Gray) Isely | ACANT4 |
| precocious milkvetch | Astragalus proimanthus Barneby | ASPR7 |
| pretty afzelia | Afzelia bella Harms | AFBE |
| Preuss's milkvetch | Astragalus preussii Gray | ASPR6 |
| Preuss's milkvetch | Astragalus preussii Gray var. laxiflorus Gray | ASPRL2 |
| Preuss's milkvetch | Astragalus preussii Gray var. preussii | ASPRP3 |
| prickly clover | Trifolium echinatum Bieb. | TREC2 |
| prickly clover | Trifolium echinatum Bieb. var. echinatum | TRECE |
| prickly Moses | Acacia verticillata (L'H?r.) Willd. | ACVE2 |
| prickly scorpion's-tail | Scorpiurus muricatus L. | SCMU3 |
| pride of California | Lathyrus splendens Kellogg | LASP3 |
| pride-of-Barbados | Caesalpinia pulcherrima (L.) Sw. | CAPU13 |
| Pringle's prairie clover | Dalea pringlei Gray | DAPR |
| privet senna | Senna ligustrina (L.) Irwin & Barneby | SELI9 |
| professor-weed | Galega L. | GALEG |
| professor-weed | Galega officinalis L. | GAOF |
| Prosopis farcta | Prosopis stephaniana (Bieb.) Kunth ex Spreng. | PRST5 |
| Prosopis glandulosa var. glandulosa | Prosopis chilensis (Molina) Stuntz var. glandulosa (Torr.) Standl. | PRCHG |
| Prosopis glandulosa var. glandulosa | Prosopis juliflora (Sw.) DC. var. glandulosa (Torr.) Cockerell | PRJUG2 |
| Prosopis glandulosa var. glandulosa | Prosopis juliflora auct. p.p., non (Sw.) DC. | PRJU |
| Prosopis glandulosa var. torreyana | Prosopis juliflora (Sw.) DC. var. torreyana L. Benson | PRJUT |
| Prosopis glandulosa var. torreyana | Prosopis odorata Torr. & Fr?m. | PROD2 |
| Prosopis pallida | Prosopis limensis Benth. | PRLI |
| Prosopis pubescens | Strombocarpa odorata Gray | STOD |
| Prosopis reptans var. cinerascens | Prosopis cinerascens (Gray) Benth. | PRCI2 |
| Prosopis velutina | Neltuma velutina (Woot.) Britt. & Rose | NEVE |
| Prosopis velutina | Prosopis articulata S. Wats. | PRAR4 |
| Prosopis velutina | Prosopis chilensis (Molina) Stuntz var. velutina (Woot.) Standl. | PRCHV |
| Prosopis velutina | Prosopis juliflora (Sw.) DC. var. articulata (S. Wats.) Wiggins | PRJUA |
| Prosopis velutina | Prosopis juliflora (Sw.) DC. var. velutina (Woot.) Sarg. | PRJUV2 |
| Prosopis velutina | Prosopis juliflora auct. p.p., non (Sw.) DC. | PRJU |
| prostrate milkvetch | Astragalus miser Dougl. var. decumbens (Nutt. ex Torr. & Gray) Cronq. | ASMID |
| prostrate ticktrefoil | Desmodium rotundifolium DC. | DERO3 |
| Providence Mountain milkvetch | Astragalus nutans M.E. Jones | ASNU3 |
| psophocarpus | Psophocarpus Necker ex DC. | PSOPH2 |
| psophocarpus | Psophocarpus palustris Desv. | PSPA4 |
| Psophocarpus palustris | Psophocarpus palmettorum Guillemin, Perrottet, & A. Rich. | PSPA5 |
| Psoralidium junceum | Psoralea juncea Eastw. | PSJU |
| Psoralidium lanceolatum | Psoralea lanceolata Pursh | PSLA |
| Psoralidium lanceolatum | Psoralea lanceolata Pursh ssp. scabra (Nutt.) Piper | PSLAS3 |
| Psoralidium lanceolatum | Psoralea lanceolata Pursh var. purshii (Vail) Piper | PSLAP2 |
| Psoralidium lanceolatum | Psoralea lanceolata Pursh var. stenophylla (Rydb.) Toft & Welsh | PSLAS |
| Psoralidium lanceolatum | Psoralea lanceolata Pursh var. stenostachys (Rydb.) Welsh | PSLAS2 |
| Psoralidium lanceolatum | Psoralea micrantha Gray | PSMI5 |
| Psoralidium lanceolatum | Psoralea scabra Nutt. | PSSC7 |
| Psoralidium lanceolatum | Psoralea stenostachys Rydb. | PSST3 |
| Psoralidium lanceolatum | Psoralidium lanceolatum (Pursh) Rydb. var. stenophyllum (Rydb.) Welsh | PSLAS4 |
| Psoralidium lanceolatum | Psoralidium lanceolatum (Pursh) Rydb. var. stenostachys (Rydb.) Welsh | PSLAS5 |
| Psoralidium lanceolatum | Psoralidium stenophyllum (Rydb.) Rydb. | PSST4 |
| Psoralidium tenuiflorum | Psoralea floribunda Nutt. ex Torr. & Gray | PSFL |
| Psoralidium tenuiflorum | Psoralea obtusifolia Torr. & Gray | PSOB80 |
| Psoralidium tenuiflorum | Psoralea tenuiflora Pursh | PSTE3 |
| Psoralidium tenuiflorum | Psoralea tenuiflora Pursh var. bigelovii (Rydb.) J.F. Macbr. | PSTEB2 |
| Psoralidium tenuiflorum | Psoralea tenuiflora Pursh var. floribunda (Nutt. ex Torr. & Gray) Rydb. | PSTEF2 |
| Psoralidium tenuiflorum | Psoralidium batesii Rydb. | PSBA7 |
| Psorothamnus arborescens var. arborescens | Dalea arborescens Torr. ex Gray | DAAR4 |
| Psorothamnus arborescens var. arborescens | Dalea fremontii Torr. ex Gray var. saundersii (Parish) Munz | DAFRS |
| Psorothamnus arborescens var. minutifolius | Dalea fremontii Torr. ex Gray var. minutifolia (Parish) L. Benson | DAFRM2 |
| Psorothamnus arborescens var. pubescens | Dalea amoena S. Wats. | DAAM4 |
| Psorothamnus arborescens var. pubescens | Dalea amoena S. Wats. var. pubescens (Parish) Peebles | DAAMP |
| Psorothamnus arborescens var. pubescens | Dalea fremontii Torr. ex Gray var. pubescens (Parish) L. Benson | DAFRP2 |
| Psorothamnus arborescens var. simplifolius | Dalea californica S. Wats. | DACA |
| Psorothamnus arborescens var. simplifolius | Dalea fremontii Torr. ex Gray var. simplifolia (Parish) L. Benson | DAFRS2 |
| Psorothamnus emoryi | Dalea emoryi Gray | DAEM3 |
| Psorothamnus fremontii var. fremontii | Dalea fremontii Torr. ex Gray | DAFR4 |
| Psorothamnus fremontii var. fremontii | Dalea fremontii Torr. ex Gray var. johnsonii (S. Wats.) Munz | DAFRJ2 |
| Psorothamnus kingii | Dalea kingii S. Wats. | DAKI2 |
| Psorothamnus polydenius var. polydenius | Dalea polydenia Torr. ex S. Wats. | DAPO4 |
| Psorothamnus polydenius var. polydenius | Dalea polydenia Torr. ex S. Wats. var. subnuda S. Wats. | DAPOS |
| Psorothamnus schottii | Dalea schottii Torr. | DASC6 |
| Psorothamnus schottii | Dalea schottii Torr. var. puberula (Parish) Munz | DASCP2 |
| Psorothamnus scoparius | Dalea scoparia Gray | DASC7 |
| Psorothamnus spinosus | Dalea spinosa Gray | DASP3 |
| Psorothamnus thompsoniae var. thompsoniae | Dalea thompsoniae (Vail) L.O. Williams | DATH5 |
| Psorothamnus thompsoniae var. whitingii | Dalea whitingii Kearney & Peebles | DAWH3 |
| pterocarpus | Pterocarpus indicus Willd. | PTIN2 |
| pterocarpus | Pterocarpus Jacq. | PTERO |
| pterocarpus | Pterocarpus osun Craib | PTOS |
| puakauhi | Canavalia hawaiiensis O.& I. Deg. & Sauer | CAHA12 |
| Pueraria montana | Glycine javanica L. | GLJA2 |
| Pueraria montana var. lobata | Dolichos lobatus Willd. | DOLO2 |
| Pueraria montana var. lobata | Pueraria hirsuta (Thunb.) C. Schneider | PUHI3 |
| Pueraria montana var. lobata | Pueraria lobata (Willd.) Ohwi | PULO |
| Pueraria montana var. lobata | Pueraria lobata (Willd.) Ohwi var. thomsonii (Benth.) Maesen | PULOT |
| Pueraria montana var. lobata | Pueraria thunbergiana (Sieb. & Zucc.) Benth. | PUTH |
| Pueraria montana var. montana | Pueraria tonkinensis Gagnep. | PUTO2 |
| Puerto Rico jointvetch | Aeschynomene gracilis Vogel | AEGR |
| Puerto Rico prairie clover | Dalea carthagenensis (Jacq.) J.F. Macbr. var. portoricana Barneby | DACAP |
| Puerto Rico sensitive pea | Chamaecrista portoricensis (Urban) O.F. Cook & Collins | CHPO8 |
| Puerto Rico sensitive-briar | Mimosa asperata L. | MIAS3 |
| puff | Neptunia Lour. | NEPTU |
| purple broad vetch | Vicia narbonensis L. | VINA |
| purple bushbean | Macroptilium atropurpureum (Moc. & Sess? ex DC.) Urban | MAAT80 |
| purple clover | Trifolium purpureum Lois. | TRPU15 |
| purple cowpea | Vigna peduncularis (Kunth) Fawcett & Rendle | VIPE7 |
| purple dalea | Dalea lasiathera Gray | DALA4 |
| purple desert lupine | Lupinus shockleyi S. Wats. | LUSH |
| purple locoweed | Oxytropis lambertii Pursh | OXLA3 |
| purple locoweed | Oxytropis lambertii Pursh var. articulata (Greene) Barneby | OXLAA2 |
| purple locoweed | Oxytropis lambertii Pursh var. bigelovii Gray | OXLAB |
| purple locoweed | Oxytropis lambertii Pursh var. lambertii | OXLAL2 |
| purple milkvetch | Astragalus agrestis Dougl. ex G. Don | ASAG2 |
| purple prairie clover | Dalea purpurea Vent. | DAPU5 |
| purple prairie clover | Dalea purpurea Vent. var. arenicola (Wemple) Barneby | DAPUA |
| purple prairie clover | Dalea purpurea Vent. var. purpurea | DAPUP |
| purple stickpea | Calliandra purpurea (L.) Benth. | CAPU33 |
| purpletassels | Dalea gattingeri (Heller) Barneby | DAGA |
| Pursh's rattlebox | Crotalaria purshii DC. | CRPU5 |
| pussyfoot | Dalea obovata (Torr. & Gray) Shinners | DAOB |
| pygmy clover | Trifolium longipes Nutt. ssp. pygmaeum (Gray) J. Gillett | TRLOP2 |
| pygmyflower vetch | Vicia minutiflora F.G. Dietr. | VIMI |
| quebracho | Lysiloma divaricatum (Jacq.) J. F. Macbr. | LYDI7 |
| quickstick | Gliricidia Kunth | GLIRI |
| quickstick | Gliricidia sepium (Jacq.) Kunth ex Walp. | GLSE2 |
| Quincy lupine | Lupinus dalesiae Eastw. | LUDA |
| quorn wattle | Acacia quornensis J. M. Black | ACQU2 |
| rabbitbells | Crotalaria rotundifolia Walt. ex J.F. Gmel. | CRRO5 |
| rabbitfoot clover | Trifolium arvense L. | TRAR4 |
| rabbitfoot clover | Trifolium arvense L. var. arvense | TRARA |
| railhead milkvetch | Astragalus terminalis S. Wats. | ASTE9 |
| railroadfence | Bauhinia pauletia Pers. | BAPA3 |
| raintree | Samanea Merr. | SAMAN |
| raintree | Samanea saman (Jacq.) Merr. | SASA10 |
| rancheria clover | Trifolium albopurpureum Torr. & Gray | TRAL5 |
| rare loco milkvetch | Astragalus leptocarpus Torr. & Gray | ASLE10 |
| Rattan's milkvetch | Astragalus rattanii Gray | ASRA4 |
| Rattan's milkvetch | Astragalus rattanii Gray var. rattanii | ASRAR3 |
| rattlebox | Crotalaria alata Buch.-Ham. ex D. Don | CRAL12 |
| rattlebox | Crotalaria L. | CROTA |
| rattlebox | Crotalaria mysorensis Roth | CRMY |
| rattlebox | Crotalaria paulina Schrank | CRPA22 |
| rattlebox | Crotalaria vitellina Ker Gawler | CRVI13 |
| rattlebox | Sesbania punicea (Cav.) Benth. | SEPU7 |
| rattleweed | Crotalaria retusa L. | CRRE4 |
| Raven's milkvetch | Astragalus ravenii Barneby | ASRA5 |
| recurved milkvetch | Astragalus recurvus Greene | ASRE2 |
| red beadtree | Adenanthera pavonina L. | ADPA |
| red clover | Trifolium pratense L. | TRPR2 |
| red hoarypea | Tephrosia vicioides Schtdl. | TEVI9 |
| red lupine | Lupinus ruber Heller | LURU3 |
| red moneywort | Alysicarpus rugosus (Willd.) DC. | ALRU4 |
| red pea | Lathyrus cicera L. | LACI |
| red powderpuff | Calliandra haematomma (Bertero ex DC.) Benth. | CAHA10 |
| red sandalwood | Pterocarpus santalinus L. f. | PTSA |
| red wattle | Acacia silvestris Tindale | ACSI5 |
| red-leaf wattle | Acacia rubida A. Cunn. | ACRU11 |
| redbud | Cercis L. | CERCI2 |
| redcardinal | Erythrina herbacea L. | ERHE4 |
| reddish tufted vetch | Vicia benghalensis L. | VIBE |
| redflower bird's-foot trefoil | Lotus rubriflorus H.K. Sharsmith | LORU |
| redwood pea | Lathyrus glandulosus Broich | LAGL8 |
| restharrow | Ononis L. | ONONI |
| retama | Poitea paucifolia (DC.) Lavin | POPA34 |
| Retama monosperma | Genista monosperma (L.) Lam. | GEMO3 |
| retama prieta | Senna polyphylla (Jacq.) Irwin & Barneby | SEPO5 |
| retem | Retama raetam (Forssk.) Webb & Berthel. | RERA2 |
| reversed clover | Trifolium resupinatum L. | TRRE4 |
| rhizoma peanut | Arachis glabrata Benth. [excluded] | ARGL18 |
| rhizoma peanut | Arachis hagenbeckii Harms | ARHA10 |
| Rhodesian copalwood | Guibourtia coleosperma (Benth.) J. L?onard | GUCO2 |
| Rhynchosia americana | Lathyrus americanus Houst. ex P. Mill. | LAAM2 |
| Rhynchosia caribaea | Glycine caribaea Jacq. | GLCA3 |
| Rhynchosia cytisoides | Lespedeza cytisoides Bertol. | LECY3 |
| Rhynchosia cytisoides | Pitcheria galactoides Nutt. | PIGA3 |
| Rhynchosia cytisoides | Rhynchosia galactoides (Nutt.) Endl. ex Walp. | RHGA |
| Rhynchosia densiflora ssp. chrysadenia | Rhynchosia chrysadenia Taub. | RHCH11 |
| Rhynchosia difformis | Arcyphyllum difforme Ell. | ARDI13 |
| Rhynchosia difformis | Dolicholus tomentosus (L.) Vail | DOTO |
| Rhynchosia difformis | Rhynchosia tomentosa (L.) Hook. & Arn. var. volubilis (Michx.) Torr. & Gray | RHTOV |
| Rhynchosia edulis | Rhynchosia pinetorum Standl. | RHPI3 |
| Rhynchosia edulis | Rhynchosia rariflora Standl. | RHRA5 |
| Rhynchosia latifolia | Dolicholus latifolius (Nutt. ex Torr. & Gray) Vail | DOLA4 |
| Rhynchosia latifolia | Rhynchosia torreyi Vail | RHTO5 |
| Rhynchosia malacophylla | Rhynchosia sennaarensis Hochst. ex Schweinf. | RHSE8 |
| Rhynchosia michauxii | Dolicholus michauxii (Vail) Vail | DOMI5 |
| Rhynchosia minima | Dolicholus minimus (L.) Medik. | DOMI3 |
| Rhynchosia minima | Dolichos minimus L. | DOMI2 |
| Rhynchosia minima | Rhynchosia minima (L.) DC. var. diminifolia Walraven | RHMID |
| Rhynchosia parvifolia | Leucopterum parvifolium (DC.) Small | LEPA14 |
| Rhynchosia phaseoloides | Dolicholus pyramidalis auct. non (Lam.) Britt. & P. Wilson [misapplied] | DOPY |
| Rhynchosia phaseoloides | Glycine phaseoloides Sw. | GLPH |
| Rhynchosia reniformis | Dolicholus simplicifolius (Walt.) Vail | DOSI |
| Rhynchosia reniformis | Glycine reniformis Pursh | GLRE |
| Rhynchosia reniformis | Rhynchosia simplicifolius (Walt.) Wood, non (Kunth) DC. | RHSI |
| Rhynchosia reniformis | Rhynchosia tomentosa (L.) Hook. & Arn. var. monophylla (Michx.) Torr. & Gray | RHTOM2 |
| Rhynchosia reticulata | Dolicholus reticulatus (Sw.) Millsp. | DORE3 |
| Rhynchosia reticulata | Glycine reticulata Sw. | GLRE2 |
| Rhynchosia senna var. texana | Rhynchosia senna Gillies ex Hook. var. angustifolia (Gray) Grear | RHSEA |
| Rhynchosia senna var. texana | Rhynchosia texana Torr. & Gray | RHTE |
| Rhynchosia swartzii | Dolicholus swartzii Vail | DOSW |
| Rhynchosia tomentosa var. mollissima | Rhynchosia mollissima (Ell.) Shuttlw. ex S. Wats. | RHMO |
| Rhynchosia tomentosa var. tomentosa | Dolicholus erectus (Walt.) Vail | DOER2 |
| Rhynchosia tomentosa var. tomentosa | Glycine tomentosa L., non Dolicholus tomentosus (L.) Vail | GLTO |
| Rhynchosia tomentosa var. tomentosa | Rhynchosia erecta (Walt.) DC. | RHER |
| Rhynchosia tomentosa var. tomentosa | Rhynchosia intermedia (Torr. & Gray) Small | RHIN8 |
| Rhynchosia tomentosa var. tomentosa | Rhynchosia tomentosa (L.) Hook. & Arn. var. erecta (Walt.) Torr. & Gray | RHTOE2 |
| rice bean | Vigna umbellata (Thunb.) Ohwi & H. Ohashi | VIUM2 |
| rimrock milkvetch | Astragalus desperatus M.E. Jones | ASDE3 |
| rimrock milkvetch | Astragalus desperatus M.E. Jones var. conspectus Barneby | ASDEC |
| rimrock milkvetch | Astragalus desperatus M.E. Jones var. desperatus | ASDED |
| rimrock milkvetch | Astragalus desperatus M.E. Jones var. petrophilus M.E. Jones | ASDEP |
| Rio Grande stickpea | Calliandra conferta Benth. | CACO |
| Rio Loc stickpea | Calliandra locoensis R. Garcia & D. Kolterman | CALO15 |
| Ripley's milkvetch | Astragalus ripleyi Barneby | ASRI2 |
| Ripley's senna | Senna ripleyana (Irwin & Barneby) Irwin & Barneby | SERI7 |
| river koko | Inga vera Willd. | INVE |
| riverbank lupine | Lupinus rivularis Dougl. ex Lindl. | LURI |
| riverbar bird's-foot trefoil | Lotus denticulatus (E. Drew) Greene | LODE |
| riverhemp | Sesbania Scop. | SESBA |
| Roald's locoweed | Oxytropis campestris (L.) DC. var. roaldii (Ostenf.) Welsh | OXCAR3 |
| Robbins's milkvetch | Astragalus robbinsii (Oakes) Gray | ASRO |
| Robbins's milkvetch | Astragalus robbinsii (Oakes) Gray var. alpiniformis (Rydb.) Barneby ex C.L. Hitchc. | ASROA |
| Robbins's milkvetch | Astragalus robbinsii (Oakes) Gray var. minor (Hook.) Barneby | ASROM |
| Robbins's milkvetch | Astragalus robbinsii (Oakes) Gray var. robbinsii | ASROR |
| Robinia ?ambigua | Robinia ?ambigua Poir. (pro sp.) var. bella-rosea (Nichols.) Rehd. | ROAMB |
| Robinia ?ambigua | Robinia ?dubia Foucault | RODU2 |
| Robinia ?holdtii | Robinia ?coloradensis Dode | ROCO7 |
| Robinia ?margarettiae | Robinia ?slavinii Rehd. | ROSL3 |
| Robinia hispida var. fertilis | Robinia fertilis Ashe | ROFE3 |
| Robinia hispida var. fertilis | Robinia grandiflora Ashe | ROGR |
| Robinia hispida var. fertilis | Robinia pedunculata Ashe | ROPE |
| Robinia hispida var. hispida | Robinia grandiflora auct. non Ashe nec L. nec Schneid. [misapplied] | ROGR3 |
| Robinia hispida var. hispida | Robinia pallida Ashe | ROPA5 |
| Robinia hispida var. hispida | Robinia speciosa Ashe | ROSP5 |
| Robinia hispida var. kelseyi | Robinia kelseyi Cowell ex Hutchinson | ROKE |
| Robinia hispida var. nana | Robinia elliottii (Chapman) Ashe ex Small | ROEL2 |
| Robinia hispida var. nana | Robinia nana Ell. | RONA |
| Robinia hispida var. rosea | Robinia albicans Ashe | ROAL2 |
| Robinia hispida var. rosea | Robinia boyntonii Ashe | ROBO2 |
| Robinia hispida var. rosea | Robinia leucantha Rehd. | ROLE |
| Robinia neomexicana var. neomexicana | Robinia luxurians (Dieck) Schneid. ex Tarouca & Schneid. | ROLU |
| Robinia neomexicana var. neomexicana | Robinia neomexicana Gray var. luxurians Dieck | RONEL |
| Robinia neomexicana var. neomexicana | Robinia neomexicana Gray var. subvelutina (Rydb.) Kearney & Peebles | RONES |
| Robinia neomexicana var. rusbyi | Robinia breviloba Rydb. | ROBR2 |
| Robinia neomexicana var. rusbyi | Robinia rusbyi Woot. & Standl. | RORU4 |
| Robinia pseudoacacia | Robinia pseudoacacia L. | ROPSI2 |
| Robinia pseudoacacia | Robinia pseudoacacia L. var. pyramidalis Pepin | ROPSP |
| Robinia pseudoacacia | Robinia pseudoacacia L. var. rectissima (L.) Raber | ROPSR |
| Robinia viscosa var. hartwegii | Robinia hartwegii Koehne | ROHA |
| rock bird's-foot trefoil | Lotus haydonii (Orcutt) Greene | LOHA3 |
| rock Indian breadroot | Pediomelum reverchonii (S. Wats.) Rydb. | PERE10 |
| rock lupine | Lupinus saxosus T.J. Howell | LUSA2 |
| rock lupine | Lupinus saxosus T.J. Howell var. saxosus | LUSAS |
| rock lupine | Lupinus saxosus T.J. Howell var. subsericeus (B.L. Robins. ex Piper) C.P. Sm. | LUSAS2 |
| Rocky Mountain clover | Trifolium attenuatum Greene | TRAT |
| Rocky Mountain milkvetch | Astragalus scopulorum Porter | ASSC7 |
| Roemer's false indigo | Amorpha roemeriana Scheele | AMRO2 |
| Roemer's mimosa | Mimosa roemeriana Scheele | MIRO6 |
| Rogue River lupine | Lupinus lyallii Gray ssp. lyallii var. roguensis Cox | LULYR2 |
| Rogue River milkvetch | Astragalus accidens S. Wats. | ASAC |
| Rogue River milkvetch | Astragalus accidens S. Wats. var. accidens | ASACA2 |
| Rollins's clover | Trifolium rollinsii J. Gillett | TRRO5 |
| Roman-cassie | Acacia caven (Molina) Molina | ACCA35 |
| rooibos | Aspalathus linearis (Burman f.) R. Dahlgren | ASLI14 |
| rosary babybonnets | Coursetia glandulosa Gray | COGL8 |
| rosary snoutbean | Rhynchosia precatoria DC. | RHPR4 |
| rosarypea | Abrus precatorius L. | ABPR3 |
| rose clover | Trifolium hirtum All. | TRHI4 |
| Rose's ticktrefoil | Desmodium rosei Schub. | DERO2 |
| rosy bird's-foot trefoil | Lotus aboriginus Jepson | LOAB |
| rosy lupine | Lupinus roseolus Rydb. | LURO |
| rough clover | Trifolium scabrum L. | TRSC7 |
| roughhairy indigo | Indigofera hirsuta L. | INHI |
| round-head clover | Trifolium globosum L. | TRGL10 |
| roundflower catclaw | Acacia roemeriana Scheele | ACRO |
| roundhead lespedeza | Lespedeza capitata Michx. | LECA8 |
| roundhead prairie clover | Dalea multiflora (Nutt.) Shinners | DAMU |
| roundleaf dunebroom | Errazurizia rotundata (Woot.) Barneby | ERRO7 |
| roundleaf leather-root | Hoita orbicularis (Lindl.) Rydb. | HOOR |
| roundleaf sensitive pea | Chamaecrista rotundifolia (Pers.) Greene | CHRO3 |
| Roxburgh's cassia | Cassia roxburghii DC. | CARO33 |
| royal poinciana | Delonix regia (Bojer ex Hook.) Raf. | DERE |
| royal snoutbean | Rhynchosia cytisoides (Bertol.) Wilbur | RHCY4 |
| Rueppell's clover | Trifolium rueppellianum Fresen. | TRRU7 |
| Rugel's hoarypea | Tephrosia rugelii Shuttlw. ex B.L. Robins. | TERU |
| running buffalo clover | Trifolium stoloniferum Muhl. ex Eat. | TRST4 |
| running glade clover | Trifolium calcaricum Collins & Wieboldt | TRCA26 |
| running-postman | Kennedia prostrata R. Br. | KEPR2 |
| rupertia | Rupertia J. Grimes | RUPER |
| Rupertia hallii | Hoita hallii Rydb. | HOHA3 |
| Rupertia hallii | Psoralea hallii (Rydb.) Jepson | PSHA |
| Rupertia physodes | Psoralea physodes Dougl. ex Hook. | PSPH |
| Rupertia rigida | Psoralea rigida Parish | PSRI |
| Rusby's locust | Robinia neomexicana Gray var. rusbyi (Woot. & Standl.) Martin & Hutchins ex Peabody | RONER |
| Rusby's milkvetch | Astragalus rusbyi Greene | ASRU4 |
| rush broom | Lotus junceus (Benth.) Greene | LOJU2 |
| rush broom | Lotus junceus (Benth.) Greene var. junceus | LOJUJ |
| rush lemonweed | Psoralidium junceum (Eastw.) Rydb. | PSJU2 |
| rush peteria | Peteria scoparia Gray | PESC3 |
| rushpea | Hoffmannseggia Cav. | HOFFM |
| rushy milkvetch | Astragalus lonchocarpus Torr. | ASLO3 |
| Russian milkvetch | Astragalus falcatus Lam. | ASFA3 |
| Russian peashrub | Caragana frutex (L.) K. Koch | CAFR80 |
| rusty indigo | Indigofera colutea (Burm. f.) Merr. | INCO82 |
| rusty lupine | Lupinus pusillus Pursh | LUPU |
| rusty lupine | Lupinus pusillus Pursh ssp. pusillus | LUPUP |
| rusty lupine | Lupinus pusillus Pursh ssp. rubens (Rydb.) D. Dunn | LUPUR |
| Rydberg's Indian breadroot | Pediomelum humile Rydb. | PEHU6 |
| Rydberg's milkvetch | Astragalus perianus Barneby | ASPE6 |
| Sabin's lupine | Lupinus sabinianus Dougl. ex Lindl. | LUSA3 |
| sabinal prairie clover | Dalea sabinalis (S. Wats.) Shinners | DASA |
| sacky sac bean | Inga laurina (Sw.) Willd. | INLA |
| sainfoin | Onobrychis P. Mill. | ONOBR |
| sainfoin | Onobrychis viciifolia Scop. | ONVI |
| Salinas milkvetch | Astragalus macrodon (Hook. & Arn.) Gray | ASMA3 |
| Salmon River locoweed | Oxytropis besseyi (Rydb.) Blank. var. salmonensis Barneby | OXBES |
| Salton milkvetch | Astragalus crotalariae (Benth.) Gray | ASCR5 |
| salty loco milkvetch | Astragalus lentiginosus Dougl. ex Hook. var. salinus (T.J. Howell) Barneby | ASLES |
| Samanea saman | Albizia saman (Jacq.) F. Muell. | ALSA4 |
| Samanea saman | Pithecellobium saman (Jacq.) Benth. | PISA3 |
| Sampson's snakeroot | Orbexilum pedunculatum (P. Mill.) Rydb. | ORPE |
| Sampson's snakeroot | Orbexilum pedunculatum (P. Mill.) Rydb. var. pedunculatum | ORPEP2 |
| Sampson's snakeroot | Orbexilum pedunculatum (P. Mill.) Rydb. var. psoralioides (Walt.) Isely | ORPEP |
| San Bernardino milkvetch | Astragalus bernardinus M.E. Jones | ASBE4 |
| San Clemente Island milkvetch | Astragalus nevinii Gray | ASNE5 |
| San Diego bird's-foot trefoil | Lotus hamatus Greene | LOHA2 |
| San Jacinto lupine | Lupinus hyacinthinus Greene | LUHY3 |
| San Joaquin milkvetch | Astragalus asymmetricus Sheldon | ASAS3 |
| San Juan milkvetch | Astragalus chuskanus Barneby & Spellenberg | ASCH13 |
| San Luis lupine | Lupinus ludovicianus Greene | LULU |
| San Mateo tree lupine | Lupinus eximius Burtt-Davy | LUEX2 |
| San Miguel milkvetch | Astragalus miguelensis Greene | ASMI6 |
| San Obispo milkvetch | Astragalus didymocarpus Hook. & Arn. var. obispoensis (Rydb.) Jepson | ASDIO |
| San Pedro false prairie-clover | Marina calycosa (Gray) Barneby | MACA8 |
| San Pedro ticktrefoil | Desmodium batocaulon Gray | DEBA3 |
| San Rafael milkvetch | Astragalus rafaelensis M.E. Jones | ASRA3 |
| sand lupine | Lupinus ammophilus Greene | LUAM |
| sand pea | Eriosema (DC.) D. Don | ERIOS8 |
| sand ticktrefoil | Desmodium lineatum DC. | DELI2 |
| sandbar milkvetch | Astragalus endopterus (Barneby) Barneby | ASEN3 |
| sandhills milkvetch | Astragalus michauxii (Kuntze) F.J. Herm. | ASMI2 |
| sandstone milkvetch | Astragalus sesquiflorus S. Wats. | ASSE7 |
| Santa Barbara milkvetch | Astragalus trichopodus (Nutt.) Gray | ASTR6 |
| Santa Barbara milkvetch | Astragalus trichopodus (Nutt.) Gray var. lonchus (M.E. Jones) Barneby | ASTRL |
| Santa Barbara milkvetch | Astragalus trichopodus (Nutt.) Gray var. phoxus (M.E. Jones) Barneby | ASTRP |
| Santa Barbara milkvetch | Astragalus trichopodus (Nutt.) Gray var. trichopodus | ASTRT2 |
| Santa Catalina prairie clover | Dalea pulchra H.C. Gentry | DAPU4 |
| Santa Cruz clover | Trifolium buckwestiorum Isley | TRBU3 |
| Santa Cruz Island silverhosackia | Lotus argophyllus (Gray) Greene var. adsurgens Dunkle | LOARA5 |
| Santa Cruz Island silverhosackia | Lotus argophyllus (Gray) Greene var. niveus (Greene) Ottley | LOARN3 |
| Santa Cruz Island ticktrefoil | Desmodium psilocarpum Gray | DEPS |
| Santa Fe milkvetch | Astragalus feensis M.E. Jones | ASFE2 |
| Santa Inez goldenbanner | Thermopsis macrophylla Hook. & Arn. | THMA2 |
| Santa Lucia lupine | Lupinus cervinus Kellogg | LUCE |
| Santa Rita Mountain bean | Phaseolus ritensis M.E. Jones | PHRI |
| Santa Rita Mountain ticktrefoil | Desmodium retinens Schlecht. | DERE4 |
| sappanwood | Caesalpinia sappan L. | CASA28 |
| Sarawak bean | Vigna hosei (Craib) Backer | VIHO80 |
| sasswood | Erythrophleum Afzel. ex R. Br. | ERYTH6 |
| sasswood | Erythrophleum suaveolens (Guillemin & Perrottet) Brenan | ERSU14 |
| satiny milkvetch | Astragalus magdalenae Greene | ASMA4 |
| Scamman's oxytrope | Oxytropis scammaniana Hult | OXSC |
| scareweed | Baptisia simplicifolia Croom | BASI |
| scarlet milkvetch | Astragalus coccineus Brandeg. | ASCO6 |
| scarlet runner | Phaseolus coccineus L. | PHCO6 |
| scented senna | Senna artemisioides (Gaud. ex DC.) Randell ssp. ?coriacea (Benth.) Randell | SEARC |
| Schaffner's wattle | Acacia schaffneri (S. Wats.) F.J. Herm. | ACSC2 |
| Schaffner's wattle | Acacia schaffneri (S. Wats.) F.J. Herm. var. bravoensis Isely | ACSCB |
| Schaffner's wattle | Acacia schaffneri (S. Wats.) F.J. Herm. var. schaffneri (S. Wats.) F.J. Herm. [excluded] | ACSCS2 |
| Schmoll's milkvetch | Astragalus schmolliae C.L. Porter | ASSC5 |
| Schomburgk's mimosa | Mimosa schomburgkii Benth. | MISC5 |
| Schott's dalea | Psorothamnus schottii (Torr.) Barneby | PSSC5 |
| Schott's stickpea | Zapoteca formosa (Kunth) H. Hern?ndez | ZAFO |
| Schott's stickpea | Zapoteca formosa (Kunth) H. Hern?ndez var. schottii (Torr. ex S. Wats.) H. Hern?ndez | ZAFOS |
| Schott's wattle | Acacia schottii Torr. | ACSC |
| Schott's yellowhood | Nissolia schottii (Torr.) Gray | NISC |
| Schwerin's false indigo | Amorpha schwerinii Schneid. | AMSC2 |
| scorpion milkvetch | Astragalus lentiginosus Dougl. ex Hook. var. scorpionis M.E. Jones | ASLES2 |
| scorpion senna | Coronilla emerus L. | COEM3 |
| scorpion ticktrefoil | Desmodium scorpiurus (Sw.) Desv. | DESC5 |
| scorpion's-tail | Scorpiurus L. | SCORP |
| Scorpiurus muricatus | Scorpiurus subvillosus L. | SCSU5 |
| Scorpiurus muricatus | Scorpiurus sulcatus L. | SCSU3 |
| Scotch broom | Cytisus scoparius (L.) Link | CYSC4 |
| Scotch broom | Cytisus scoparius (L.) Link var. andreanus (Puiss.) Dippel | CYSCA |
| Scotch broom | Cytisus scoparius (L.) Link var. scoparius | CYSCS2 |
| Scotch laburnum | Laburnum alpinum (Mill.) J. Presl | LAAL8 |
| screw-pod wattle | Acacia implexa Benth. | ACIM5 |
| screwbean mesquite | Prosopis pubescens Benth. | PRPU |
| scurf hoarypea | Tephrosia chrysophylla Pursh | TECH |
| scurfpea | Cullen Medik. | CULLE |
| scurfpea | Psoralidium Rydb. | PSORA2 |
| sea clover | Trifolium squamosum L. | TRSQ |
| seabean | Mucuna gigantea (Willd.) DC. | MUGI |
| Searls's prairie clover | Dalea searlsiae (Gray) Barneby | DASE3 |
| seashore lupine | Lupinus littoralis Dougl. | LULI2 |
| seaside bird's-foot trefoil | Lotus formosissimus Greene | LOFO2 |
| Securigera cretica | Coronilla cretica L. | COCR10 |
| Securigera globosa | Coronilla globosa Lam. | COGL17 |
| Securigera orientalis | Coronilla orientalis Mill. | COOR10 |
| Securigera parviflora | Coronilla parviflora Willd., nom. illeg. [anomalous] | COPA36 |
| Securigera parviflora | Coronilla rostrata Boiss. & Spruner | CORO11 |
| Securigera securidaca | Bonaveria securidaca (L.) Reichenb. | BOSE |
| Securigera securidaca | Coronilla securidaca L. | COSE10 |
| Securigera varia | Coronilla varia L. | COVA2 |
| senna | Senna P. Mill. | SENNA |
| senna | Senna septemtrionalis (Viv.) H. Irwin & Barneby | SESE13 |
| Senna ?floribunda | Cassia corymbosa Lam. var. plurijuga Benth. | CACOP |
| Senna ?floribunda | Cassia floribunda Cav. | CAFL16 |
| Senna aciphylla | Cassia aciphylla Benth. | CAAC15 |
| Senna alata | Cassia alata L. | CAAL14 |
| Senna alata | Herpetica alata (L.) Raf. | HEAL11 |
| Senna alexandrina | Cassia acutifolia Del. | CAAC13 |
| Senna alexandrina | Cassia angustifolia Vahl | CAAN19 |
| Senna alexandrina | Cassia senna L. | CASE10 |
| Senna alexandrina | Senna angustifolia (Vahl) Batka | SEAN6 |
| Senna angulata | Cassia angulata Vogel | CAAN29 |
| Senna armata | Cassia armata S. Wats. | CAAR10 |
| Senna artemisioides | Cassia artemisioides Gaud. ex DC. | CAAR19 |
| Senna artemisioides ssp. ?coriacea | Cassia eremophila Benth., orth. var. | CAER8 |
| Senna artemisioides ssp. ?coriacea | Cassia eremophila Benth., orth. var. var. coriacea (Benth.) Symon | CAERC2 |
| Senna artemisioides ssp. ?sturtii | Cassia desolata F. Muell. | CADE32 |
| Senna artemisioides ssp. circinnata | Cassia circinnata Benth. | CACI16 |
| Senna artemisioides ssp. helmsii | Cassia helmsii Symon | CAHE25 |
| Senna artemisioides ssp. petiolaris | Cassia eremophila Benth., orth. var. var. platypoda (R. Br.) Benth. | CAERP2 |
| Senna artemisioides ssp. petiolaris | Cassia phyllodinea R. Br. | CAPH11 |
| Senna artemisioides ssp. zygophylla | Cassia eremophila Benth., orth. var. var. zygophylla (Benth.) Benth. | CAERZ2 |
| Senna bacillaris | Cassia bacillaris L. f. | CABA15 |
| Senna bacillaris | Chamaefistula bacillaris (L. f.) G. Don | CHBA7 |
| Senna bauhinioides | Cassia bauhinioides Gray | CABA6 |
| Senna bauhinioides | Cassia bauhinioides Gray var. arizonica B.L. Robins. ex J.F. Macbr. | CABAA |
| Senna bicapsularis | Adipera bicapsularis (L.) Britt. & Rose ex Britt. & P. Wilson | ADBI2 |
| Senna bicapsularis | Cassia bicapsularis L. | CABI7 |
| Senna bicapsularis | Cassia emarginata L. | CAEM3 |
| Senna bicapsularis | Isandrina emarginata (L.) Britt. & Rose ex Britt. & P. Wilson | ISEM |
| Senna coronilloides | Cassia coronilloides Benth. | CACO75 |
| Senna corymbosa | Adipera corymbosa (Lam.) Britt. & Rose | ADCO3 |
| Senna corymbosa | Cassia bonariensis Colla | CABO18 |
| Senna corymbosa | Cassia corymbosa Lam. | CACO30 |
| Senna covesii | Cassia covesii Gray | CACO16 |
| Senna didymobotrya | Cassia didymobotrya Fresen. | CADI83 |
| Senna didymobotrya | Chamaesenna didymobotrya (Fresen.) Small | CHDI4 |
| Senna durangensis var. durangensis | Cassia durangensis Rose [excluded] | CADU13 |
| Senna durangensis var. iselyi | Cassia durangensis Rose var. iselyi Irwin & Barneby | CADUI |
| Senna fructicosa | Cassia fructicosa P. Mill. [excluded] | CAFR24 |
| Senna gaudichaudii | Cassia gaudichaudii Hook. & Arn. | CAGA4 |
| Senna glutinosa ssp. chatelainiana | Cassia chatelainiana Gaudich. | CACH33 |
| Senna hebecarpa | Cassia hebecarpa Fern. | CAHE9 |
| Senna hebecarpa | Cassia hebecarpa Fern. var. longipila E.L. Braun | CAHEL |
| Senna hebecarpa | Senna hebecarpa (Fern.) Irwin & Barneby var. longipila (E.L. Braun) C.F. Reed | SEHEL |
| Senna hirsuta var. glaberrima | Cassia leptocarpa Benth. var. glaberrima M.E. Jones | CALEG |
| Senna hirsuta var. hirsuta | Cassia hirsuta L. | CAHI11 |
| Senna hirsuta var. hirsuta | Cassia tomentosa Wallich ex Arn. | CATO11 |
| Senna hirsuta var. hirsuta | Ditremexa hirsuta (L.) Britt. & Rose ex Britt. & P. Wilson | DIHI5 |
| Senna hirsuta var. leptocarpa | Cassia leptocarpa Benth. | CALE48 |
| Senna italica | Cassia obovata Colladon | CAOB6 |
| Senna italica | Cassia senna L. p.p. | CASE17 |
| Senna italica | Senna obovata (Colladon) Link | SEOB5 |
| Senna ligustrina | Cassia bahamensis P. Mill. | CABA16 |
| Senna ligustrina | Cassia ligustrina L. | CALI10 |
| Senna ligustrina | Ditremexa ligustrina (L.) Britt. & Rose | DILI7 |
| Senna ligustrina | Peiranisia bahamensis (P. Mill.) Britt. & Rose ex Britt. & P. Wilson | PEBA8 |
| Senna lindheimeriana | Cassia lindheimeriana Scheele | CALI3 |
| Senna macranthera var. micans | Cassia speciosa Schrad. | CASP32 |
| Senna marilandica | Cassia marilandica L. | CAMA15 |
| Senna marilandica | Cassia medsgeri Shafer | CAME23 |
| Senna marilandica | Ditremexa marilandica (L.) Britt. & Rose | DIMA14 |
| Senna marilandica | Ditremexa medsgeri (Shafer) Britt. & Rose | DIME4 |
| Senna mexicana var. chapmanii | Cassia chapmanii Isely | CACH11 |
| Senna multiglandulosa | Cassia multiglandulosa Jacq. | CAMU28 |
| Senna multiglandulosa | Cassia tomentosa L. | CATO24 |
| Senna multijuga | Cassia multijuga L.C. Rich. | CAMU80 |
| Senna nemophila | Cassia nemophila A. Cunningham | CANE32 |
| Senna nitida | Cassia antillana (Britt. & Rose) Alain | CAAN13 |
| Senna nitida | Cassia nitida L.C. Rich. | CANI9 |
| Senna nitida | Chamaefistula antillana Britt. & Rose | CHAN8 |
| Senna notabilis | Cassia notabilis F. Muell. | CANO6 |
| Senna obtusifolia | Cassia obtusifolia L. | CAOB5 |
| Senna obtusifolia | Cassia tora auct. non L. [misapplied] | CATO81 |
| Senna obtusifolia | Emelista tora sensu Britt. & Rose | EMTO |
| Senna occidentalis | Cassia occidentalis L. | CAOC3 |
| Senna occidentalis | Ditremexa occidentalis (L.) Britt. & Rose ex Britt. & P. Wilson | DIOC5 |
| Senna odorata | Cassia odorata R. Morris | CAOD5 |
| Senna odorata | Cassia schultesii Colla | CASC37 |
| Senna orcuttii | Cassia orcuttii (Britt. & Rose) B.L. Turner | CAOR3 |
| Senna pendula var. glabrata | Cassia coluteoides Colladon | CACO45 |
| Senna pendula var. pendula | Cassia pendula Humb. & Bonpl. ex Willd. [excluded] | CAPE48 |
| Senna pendula var. stahlii | Adipera stahlii (Urban) Britt. & Rose ex Britt. & P. Wilson | ADST |
| Senna pendula var. stahlii | Cassia stahlii Urban | CAST19 |
| Senna petersiana | Cassia petersiana Bolle | CAPE38 |
| Senna pilosior | Cassia pilosior (B.L. Robins. ex J.F. Macbr.) Irwin & Barneby | CAPI10 |
| Senna pleurocarpa var. pleurocarpa | Cassia pleurocarpa F. Muell. | CAPL17 |
| Senna polyphylla | Cassia polyphylla Jacq. | CAPO7 |
| Senna polyphylla | Peiranisia polyphylla (Jacq.) Britt. & Rose | PEPO5 |
| Senna pumilio | Cassia pumilio Gray | CAPU8 |
| Senna racemosa | Cassia ekmaniana Urban [excluded] | CAEK |
| Senna racemosa | Gaumerocassia ekmaniana (Urban) Britt. ex Britt. & Rose [excluded] | GAEK |
| Senna ripleyana | Cassia ripleyana Irwin & Barneby | CARI4 |
| Senna roemeriana | Cassia roemeriana Scheele | CARO8 |
| Senna septemtrionalis | Adipera laevigata (Willd.) Britt. & Rose | ADLA3 |
| Senna septemtrionalis | Cassia laevigata Willd. | CALA41 |
| Senna septemtrionalis | Senna septentrionalis (Viviani) Irwin & Barneby [orthographic error] | SESE9 |
| Senna siamea | Cassia siamea Lam. | CASI4 |
| Senna siamea | Sciacassia siamea (Lam.) Britt. ex Britt. & Rose | SCSI4 |
| Senna singueana | Cassia singueana Delile | CASI18 |
| Senna sophera | Cassia sophera L. | CASO81 |
| Senna spectabilis | Cassia spectabilis DC. | CASP12 |
| Senna spectabilis var. excelsa | Cassia excelsa Schrad. | CAEX15 |
| Senna spectabilis var. spectabilis | Cassia carnaval Speg. | CACA92 |
| Senna splendida | Cassia splendida Vogel | CASP33 |
| Senna stipulacea | Cassia stipulacea Aiton | CAST52 |
| Senna sulfurea | Cassia glauca Lam. | CAGL21 |
| Senna sulfurea | Cassia sulfurea DC. ex Colladon | CASU25 |
| Senna surattensis | Cassia suffruticosa Koenig ex Roth | CASU27 |
| Senna surattensis | Cassia surattensis Burm. f. | CASU62 |
| Senna surattensis | Cassia surattensis Burm. f. var. suffruticosa (Koenig ex Roth) Chatterjee | CASUS |
| Senna tora | Cassia tora L. | CATO15 |
| Senna uniflora | Cassia sericea Sw., nom. illeg. [anomalous] | CASE29 |
| Senna uniflora | Cassia uniflora P. Mill. | CAUN80 |
| Senna wislizeni | Cassia wislizeni Gray | CAWI4 |
| sensitive jointvetch | Aeschynomene sensitiva Sw. | AESE2 |
| sensitive jointvetch | Aeschynomene sensitiva Sw. var. hispidula (Kunth) Rudd [excluded] | AESEH |
| sensitive jointvetch | Aeschynomene sensitiva Sw. var. sensitiva | AESES |
| sensitive partridge pea | Chamaecrista nictitans (L.) Moench | CHNI2 |
| sensitive partridge pea | Chamaecrista nictitans (L.) Moench ssp. nictitans | CHNIN |
| sensitive partridge pea | Chamaecrista nictitans (L.) Moench ssp. nictitans var. aspera (Muhl. ex Ell.) Irwin & Barneby | CHNIA |
| sensitive partridge pea | Chamaecrista nictitans (L.) Moench ssp. nictitans var. diffusa (DC.) Irwin & Barneby | CHNID |
| sensitive partridge pea | Chamaecrista nictitans (L.) Moench ssp. nictitans var. leptadenia (Greenm.) Gandhi & Hatch | CHNIL |
| sensitive partridge pea | Chamaecrista nictitans (L.) Moench ssp. nictitans var. nictitans | CHNIN2 |
| sensitive partridge pea | Chamaecrista nictitans (L.) Moench ssp. patellaria (DC. ex Colladon) Irwin & Barneby | CHNIP |
| sensitive partridge pea | Chamaecrista nictitans (L.) Moench ssp. patellaria (DC. ex Colladon) Irwin & Barneby var. glabrata (Vogel) Irwin & Barneby | CHNIG |
| sensitive partridge pea | Chamaecrista nictitans (L.) Moench ssp. patellaria (DC. ex Colladon) Irwin & Barneby var. patellaria (DC. ex Colladon) Kartesz & Gandhi | CHNIP2 |
| sensitive pea | Chamaecrista (L.) Moench | CHAMA17 |
| sensitive plant | Mimosa L. | MIMOS |
| sentry milkvetch | Astragalus cremnophylax Barneby | ASCR3 |
| sentry milkvetch | Astragalus cremnophylax Barneby var. cremnophylax | ASCRC4 |
| sentry milkvetch | Astragalus cremnophylax Barneby var. hevronii Barneby | ASCRH |
| sentry milkvetch | Astragalus cremnophylax Barneby var. myriorrhaphis Barneby | ASCRM |
| septicweed | Senna occidentalis (L.) Link | SEOC2 |
| sericea lespedeza | Lespedeza cuneata (Dum.-Cours.) G. Don | LECU |
| sericea lespedeza | Lespedeza cuneata (Dum.-Cours.) G. Don var. serpens (Nakai) Ohwi | LECUS |
| sesbania | Sesbania cannabina Poir. | SECA23 |
| Sesbania bispinosa | Aeschynomene bispinosa Jacq. | AEBI3 |
| Sesbania bispinosa | Sesban bispinosus (Jacq.) Rydb. | SEBI8 |
| Sesbania bispinosa | Sesbania aculeata Poiret | SEAC7 |
| Sesbania drummondii | Daubentonia drummondii Rydb. | DADR2 |
| Sesbania emerus | Aeschynomene emerus Aubl. | AEEM |
| Sesbania emerus | Sesban emerus (Aubl.) Britt. & P. Wilson | SEEM2 |
| Sesbania grandiflora | Agati grandiflora (L.) Desv. | AGGR9 |
| Sesbania herbacea | Darwinia exaltata Raf. | DAEX4 |
| Sesbania herbacea | Sesban exaltatus (Raf.) Rydb. | SEEX3 |
| Sesbania herbacea | Sesbania exaltata (Raf.) Rydb. ex A.W. Hill | SEEX |
| Sesbania herbacea | Sesbania macrocarpa Muhl. ex Raf. | SEMA9 |
| Sesbania javanica | Sesbania roxburghii Merr. | SERO9 |
| Sesbania punicea | Daubentonia punicea (Cav.) DC. | DAPU8 |
| Sesbania punicea | Sesbania tripetii (Poit.) hort. ex Hubb. | SETR10 |
| Sesbania sesban var. sesban | Sesbania aegyptiaca (Poir.) Pers. | SEAE2 |
| Sesbania tomentosa | Sesbania arborea O.& I. Deg. | SEAR10 |
| Sesbania tomentosa | Sesbania hawaiiensis O.& I. Deg. | SEHA8 |
| Sesbania tomentosa | Sesbania hobdyi O.& I. Deg. | SEHO4 |
| Sesbania tomentosa | Sesbania tomentosa Hook. & Arn. var. molokaiensis O. Deg. & Sherff | SETOM |
| Sesbania vesicaria | Glottidium vesicarium (Jacq.) Harper | GLVE |
| Sesbania vesicaria | Sesbania platycarpa Pers. | SEPL6 |
| Sesbania virgata | Aeschynomene virgata Cav. | AEVI4 |
| Sesbania virgata | Sesbania marginata Benth. | SEMA81 |
| sessileflower hoarypea | Tephrosia sessiliflora (Poir.) Hassler | TESE3 |
| sessileleaf ticktrefoil | Desmodium sessilifolium (Torr.) Torr. & Gray | DESE |
| Sevier milkvetch | Astragalus piutensis Barneby & Mabberley | ASPI7 |
| shaggy lupine | Lupinus covillei Greene | LUCO4 |
| shaggy milkvetch | Astragalus malacus Gray | ASMA6 |
| shaggyhair lupine | Lupinus spectabilis Hoover | LUSP3 |
| shakeshake | Crotalaria incana L. | CRIN5 |
| shameplant | Mimosa pudica L. | MIPU8 |
| shameplant | Mimosa pudica L. var. pudica | MIPUP2 |
| shameplant | Mimosa pudica L. var. unijuga (Duchass. & Walp.) Griseb. | MIPUU |
| sharp-tooth clover | Trifolium argutum Banks & Sol. | TRAR11 |
| sharpkeel milkvetch | Astragalus acutirostris S. Wats. | ASAC3 |
| sharppod rushpea | Hoffmannseggia oxycarpa Benth. ex Gray | HOOX |
| Shasta clover | Trifolium productum Greene | TRPR4 |
| Shasta lupine | Lupinus albicaulis Dougl. var. shastensis (Heller) C.P. Sm. | LUALS |
| sheep milkvetch | Astragalus nothoxys Gray | ASNO3 |
| Sheldon's milkvetch | Astragalus sheldonii (Rydb.) Barneby | ASSH2 |
| shield clover | Trifolium clypeatum L. | TRCL2 |
| shield clover | Trifolium scutatum Boiss. | TRSC8 |
| shining false indigo | Amorpha nitens Boynt. | AMNI |
| Shockley's milkvetch | Astragalus serenoi (Kuntze) Sheldon var. shockleyi (M.E. Jones) Barneby | ASSES4 |
| shoofly | Caesalpinia decapetala (Roth) Alston | CADE15 |
| short lupine | Lupinus brevior (Jepson) Christian & D. Dunn | LUBR4 |
| Short's milkvetch | Astragalus shortianus Nutt. | ASSH3 |
| shortflower rattlebox | Crotalaria breviflora DC. | CRBR16 |
| shortstem lupine | Lupinus brevicaulis S. Wats. | LUBR2 |
| shorttooth Canadian milkvetch | Astragalus canadensis L. var. brevidens (Gandog.) Barneby | ASCAB |
| showy goldenbanner | Thermopsis robusta T.J. Howell | THRO4 |
| showy Indian clover | Trifolium amoenum Greene | TRAM3 |
| showy locoweed | Oxytropis splendens Dougl. ex Hook. | OXSP |
| showy pigeonpea | Cajanus scarabaeoides (L.) Thouars | CASC33 |
| showy rattlebox | Crotalaria spectabilis Roth | CRSP2 |
| showy ticktrefoil | Desmodium canadense (L.) DC. | DECA7 |
| Shreve's prairie acacia | Acacia angustissima (P. Mill.) Kuntze var. shrevei (Britt. & Rose) Isely | ACANS |
| shrub lespedeza | Lespedeza bicolor Turcz. | LEBI2 |
| shrubby deervetch | Lotus rigidus (Benth.) Greene | LORI3 |
| shrubby jointvetch | Aeschynomene evenia C. Wright | AEEV |
| shrubby lespedeza | Lespedeza frutescens (L.) Hornem. | LEFR5 |
| shrubby pencilflower | Stylosanthes fruticosa (Retz.) Alston | STFR80 |
| shrubby restharrow | Ononis fruticosa L. | ONFR |
| shrubby sophora | Sophora flavescens Aiton | SOFL5 |
| shyleaf | Aeschynomene americana L. | AEAM |
| Siamese cassia | Senna siamea (Lam.) Irwin & Barneby | SESI3 |
| Siberian pea-tree | Caragana boisii C. K. Schneid. | CABO19 |
| Siberian peashrub | Caragana arborescens Lam. | CAAR18 |
| sickle pigeonwings | Clitoria falcata Lam. | CLFA2 |
| sickle senna | Senna tora (L.) Roxb. | SETO4 |
| sicklefruit fenugreek | Trigonella foenum-graecum L. | TRFO80 |
| sicklekeel lupine | Lupinus albicaulis Dougl. | LUAL3 |
| sicklekeel lupine | Lupinus albicaulis Dougl. var. albicaulis | LUALA |
| sicklepod holdback | Hoffmannseggia drepanocarpa Gray | HODR |
| sidebeak pencilflower | Stylosanthes biflora (L.) B.S.P. | STBI2 |
| Sierra lupine | Lupinus grayi (S. Wats.) S. Wats. | LUGR2 |
| Sierra milkvetch | Astragalus lentiginosus Dougl. ex Hook. var. sierrae M.E. Jones | ASLES5 |
| Sierra pea | Lathyrus nevadensis S. Wats. | LANE3 |
| Sierra pea | Lathyrus nevadensis S. Wats. ssp. cusickii (S. Wats.) C.L. Hitchc. | LANEC |
| Sierra pea | Lathyrus nevadensis S. Wats. ssp. lanceolatus (T.J. Howell) C.L. Hitchc. | LANEL |
| Sierra pea | Lathyrus nevadensis S. Wats. ssp. lanceolatus (T.J. Howell) C.L. Hitchc. var. nuttallii (S. Wats.) C.L. Hitchc. | LANEN2 |
| Sierra pea | Lathyrus nevadensis S. Wats. ssp. lanceolatus (T.J. Howell) C.L. Hitchc. var. parkeri (St. John) C.L. Hitchc. | LANEP4 |
| Sierra pea | Lathyrus nevadensis S. Wats. ssp. lanceolatus (T.J. Howell) C.L. Hitchc. var. pilosellus (M.E. Peck) C.L. Hitchc. | LANEP5 |
| Sierra pea | Lathyrus nevadensis S. Wats. ssp. lanceolatus (T.J. Howell) C.L. Hitchc. var. puniceus C.L. Hitchc. | LANEP6 |
| Sierra pea | Lathyrus nevadensis S. Wats. ssp. nevadensis | LANEN |
| sieva bean | Phaseolus lunatus L. | PHLU2 |
| silktree | Albizia julibrissin Durazz. | ALJU |
| silky beach pea | Lathyrus littoralis (Nutt.) Endl. | LALI2 |
| silky deerweed | Lotus procumbens (Greene) Greene | LOPR3 |
| silky deerweed | Lotus procumbens (Greene) Greene var. procumbens | LOPRP |
| silky jackbean | Canavalia sericea Gray | CASE9 |
| silky lupine | Lupinus sericeus Pursh | LUSE4 |
| silky lupine | Lupinus sericeus Pursh ssp. huffmanii (C.P. Sm.) Fleak & D. Dunn | LUSEH |
| silky lupine | Lupinus sericeus Pursh ssp. marianus (Rydb.) Fleak & D. Dunn | LUSEM3 |
| silky lupine | Lupinus sericeus Pursh ssp. sericeus | LUSES2 |
| silky lupine | Lupinus sericeus Pursh ssp. sericeus var. egglestonianus C.P. Sm. | LUSEE2 |
| silky lupine | Lupinus sericeus Pursh ssp. sericeus var. flexuosus (Lindl. ex J.G. Agardh) C.P. Sm. | LUSEF2 |
| silky lupine | Lupinus sericeus Pursh ssp. sericeus var. maximus C.P. Sm. ex Fleak & D. Dunn | LUSEM5 |
| silky lupine | Lupinus sericeus Pursh ssp. sericeus var. sericeus | LUSES4 |
| silky lupine | Lupinus sericeus Pursh ssp. sericeus var. thompsonianus C.P. Sm. | LUSET |
| silky lupine | Lupinus sericeus Pursh ssp. sericeus var. wallowensis C.P. Sm. | LUSEW |
| silky milkvetch | Astragalus sericoleucus Gray | ASSE5 |
| silky prairie clover | Dalea villosa (Nutt.) Spreng. | DAVI |
| silky prairie clover | Dalea villosa (Nutt.) Spreng. var. grisea (Torr. & Gray) Barneby | DAVIG |
| silky prairie clover | Dalea villosa (Nutt.) Spreng. var. villosa | DAVIV |
| silky sophora | Sophora nuttalliana B.L. Turner | SONU |
| silver bird's-foot trefoil | Lotus argophyllus (Gray) Greene | LOAR3 |
| silver bird's-foot trefoil | Lotus argophyllus (Gray) Greene var. argenteus Dunkle | LOARA2 |
| silver bird's-foot trefoil | Lotus argophyllus (Gray) Greene var. argophyllus | LOARA3 |
| silver lupine | Lupinus albifrons Benth. ex Lindl. | LUAL4 |
| silver lupine | Lupinus albifrons Benth. ex Lindl. var. albifrons | LUALA2 |
| silver lupine | Lupinus albifrons Benth. ex Lindl. var. collinus Greene | LUALC |
| silver lupine | Lupinus albifrons Benth. ex Lindl. var. eminens (Greene) C.P. Sm. | LUALE |
| silver lupine | Lupinus albifrons Benth. ex Lindl. var. flumineus C.P. Sm. | LUALF |
| silver prairie clover | Dalea bicolor Humb. & Bonpl. ex Willd. | DABI |
| silver prairie clover | Dalea bicolor Humb. & Bonpl. ex Willd. var. argyrea (Gray) Barneby | DABIA |
| silver senna | Senna artemisioides (Gaud. ex DC.) Randell | SEAR13 |
| silver wattle | Acacia dealbata Link | ACDE3 |
| Silver's milkvetch | Astragalus subcinereus Gray | ASSU6 |
| silver-stem wattle | Acacia parvipinnula Tindale | ACPA9 |
| silverleaf Indian breadroot | Pediomelum argophyllum (Pursh) J. Grimes | PEAR6 |
| silverleaf milkvetch | Astragalus argophyllus Nutt. | ASAR4 |
| silverleaf milkvetch | Astragalus argophyllus Nutt. var. argophyllus | ASARA |
| silverleaf milkvetch | Astragalus argophyllus Nutt. var. martinii M.E. Jones | ASARM |
| silverleaf milkvetch | Astragalus argophyllus Nutt. var. panguicensis (M.E. Jones) M.E. Jones | ASARP |
| silverleaf milkvetch | Astragalus argophyllus Nutt. var. stocksii Barneby ex Isely | ASARS |
| silvery lupine | Lupinus argenteus Pursh | LUAR3 |
| silvery lupine | Lupinus argenteus Pursh ssp. argenteus | LUARA5 |
| silvery lupine | Lupinus argenteus Pursh ssp. argenteus var. argenteus | LUARA11 |
| silvery lupine | Lupinus argenteus Pursh ssp. argenteus var. laxiflorus (Dougl. ex Lindl.) Dorn | LUARL5 |
| silvery lupine | Lupinus argenteus Pursh ssp. ingratus (Greene) Harmon | LUARI |
| silvery lupine | Lupinus argenteus Pursh ssp. moabensis D. Dunn & Harmon | LUARM3 |
| silvery lupine | Lupinus argenteus Pursh ssp. rubricaulis (Greene) Hess & D. Dunn | LUARR |
| silvery lupine | Lupinus argenteus Pursh ssp. spathulatus (Rydb.) Hess & D. Dunn | LUARS3 |
| simpleleaf ticktrefoil | Desmodium psilophyllum Schlecht. | DEPS2 |
| singlestem leather-root | Orbexilum simplex (Nutt. ex Torr. & Gray) Rydb. | ORSI |
| Siskiyou clover | Trifolium siskiyouense J. Gillett | TRSI4 |
| Siskiyou milkvetch | Astragalus whitneyi Gray var. siskiyouensis (Rydb.) Barneby | ASWHS |
| sixweeks prairie clover | Dalea polygonoides Gray | DAPO3 |
| skiff milkvetch | Astragalus microcymbus Barneby | ASMI3 |
| skunktop | Pediomelum mephiticum (S. Wats.) Rydb. | PEME8 |
| sky lupine | Lupinus nanus Dougl. ex Benth. | LUNA3 |
| sky lupine | Lupinus nanus Dougl. ex Benth. ssp. latifolius (Benth. ex Torr.) D. Dunn | LUNAL |
| sky lupine | Lupinus nanus Dougl. ex Benth. ssp. nanus | LUNAN2 |
| sky-blue lupine | Lupinus cumulicola Small | LUCU2 |
| sleeping Ute milkvetch | Astragalus tortipes J.L. Anderson & J.M. Porter | ASTO9 |
| slender bird's-foot trefoil | Lotus angustissimus L. | LOAN2 |
| slender goldenbanner | Thermopsis gracilis T.J. Howell | THGR6 |
| slender goldenbanner | Thermopsis gracilis T.J. Howell var. gracilis | THGRG |
| slender goldenbanner | Thermopsis gracilis T.J. Howell var. ovata (B.L. Robins. ex Piper) M. Mendenhall | THGRO |
| slender hop clover | Trifolium micranthum Viv. | TRMI17 |
| slender leaf rattlebox | Crotalaria ochroleuca G. Don | CROC80 |
| slender lespedeza | Lespedeza virginica (L.) Britt. | LEVI7 |
| slender milkvetch | Astragalus gracilis Nutt. | ASGR3 |
| slender rushpea | Hoffmannseggia tenella Tharp & Williams | HOTE |
| slender sensitive pea | Chamaecrista serpens (L.) Greene | CHSE9 |
| slender sensitive pea | Chamaecrista serpens (L.) Greene var. serpens | CHSES2 |
| slender vetch | Vicia laxiflora Brot. | VILA16 |
| slenderleaf bundleflower | Desmanthus leptophyllus Kunth | DELE8 |
| slenderlobe bundleflower | Desmanthus leptolobus Torr. & Gray | DELE2 |
| slickseed fuzzybean | Strophostyles leiosperma (Torr. & Gray) Piper | STLE6 |
| slimflower scurfpea | Psoralidium tenuiflorum (Pursh) Rydb. | PSTE5 |
| slimjim bean | Phaseolus filiformis Benth. | PHFI3 |
| slimleaf bean | Phaseolus angustissimus Gray | PHAN3 |
| slimleaf prairie clover | Dalea tenuifolia (Gray) Shinners | DATE5 |
| slimleaf ticktrefoil | Desmodium tenuifolium Torr. & Gray | DETE3 |
| slimspike prairie clover | Dalea phleoides (Torr. & Gray) Shinners | DAPH2 |
| slimspike prairie clover | Dalea phleoides (Torr. & Gray) Shinners var. microphylla (Torr. & Gray) Barneby | DAPHM |
| slimspike prairie clover | Dalea phleoides (Torr. & Gray) Shinners var. phleoides | DAPHP |
| small Indian breadroot | Pediomelum pentaphyllum (L.) Rydb. | PEPE27 |
| small Philippine acacia | Acacia confusa Merr. | ACCO |
| small white clover | Trifolium nigrescens Viviani | TRNI3 |
| small yellow nicker | Caesalpinia divergens Urban | CADI12 |
| Small's milkpea | Galactia smallii H.J. Rogers ex Herndon | GASM |
| small-leaf milkpea | Galactia parvifolia A. Rich. | GAPA7 |
| small-leaf snoutbean | Rhynchosia parvifolia DC. | RHPA2 |
| smallflower beach pea | Lathyrus japonicus Willd. var. parviflorus Fassett | LAJAP |
| smallflower bird's-foot trefoil | Lotus parviflorus Desf. | LOPA81 |
| smallflower indigo | Indigofera ?parviflora K. Heyne ex Wight & Arn. | INPA |
| smallflower lupine | Lupinus polycarpus Greene | LUPO3 |
| smallflowered milkvetch | Astragalus nuttallianus DC. | ASNU4 |
| smallflowered milkvetch | Astragalus nuttallianus DC. var. austrinus (Small) Barneby | ASNUA |
| smallflowered milkvetch | Astragalus nuttallianus DC. var. nuttallianus | ASNUN |
| smallhead clover | Trifolium microcephalum Pursh | TRMI4 |
| smoketree | Psorothamnus spinosus (Gray) Barneby | PSSP3 |
| smooth babybonnets | Coursetia glabella (Gray) Lavin | COGL7 |
| smooth false indigo | Amorpha laevigata Nutt. | AMLA2 |
| smooth loco milkvetch | Astragalus curvicarpus (Heller) J.F. Macbr. var. subglaber (Rydb.) Barneby | ASCUS |
| smooth mesquite | Prosopis laevigata (Humb. & Bonpl. ex Willd.) M.C. Johnston | PRLA6 |
| smooth rattlebox | Crotalaria pallida Ait. | CRPA10 |
| smooth rattlebox | Crotalaria pallida Ait. var. obovata (G. Don) Polhill | CRPAO |
| smooth senna | Senna sulfurea (DC. ex Colladon) Irwin & Barneby | SESU10 |
| smooth small-leaf ticktrefoil | Desmodium marilandicum (L.) DC. | DEMA2 |
| smooth ticktrefoil | Desmodium laevigatum (Nutt.) DC. | DELA2 |
| smooth yellow nicker | Caesalpinia culebrae (Britt. & P. Wilson) Alain | CACU10 |
| smooth yellow vetch | Vicia lutea L. | VILU2 |
| smoothpod hoarypea | Tephrosia leiocarpa Gray | TELE |
| snail medick | Medicago scutellata (L.) P. Mill. | MESC6 |
| snailflower | Vigna caracalla (L.) Verdc. [excluded] | VICA83 |
| Snake canyon milkvetch | Astragalus vallaris M.E. Jones | ASVA3 |
| snake milkvetch | Astragalus iodanthus S. Wats. var. diaphanoides Barneby | ASIOD |
| Snake River milkvetch | Astragalus purshii Dougl. ex Hook. var. ophiogenes (Barneby) Barneby | ASPUO |
| snoutbean | Rhynchosia Lour. | RHYNC2 |
| snoutbean | Rhynchosia totta (Thunb.) DC. | RHTO9 |
| Snowy River wattle | Acacia boomanii Maiden | ACBO4 |
| snub pea | Lathyrus sulphureus Brewer ex Gray | LASU |
| snub pea | Lathyrus sulphureus Brewer ex Gray var. argillaceus Jepson | LASUA |
| snub pea | Lathyrus sulphureus Brewer ex Gray var. sulphureus | LASUS |
| socarrillo | Dorycnium pentaphyllum Scop. | DOPE2 |
| soft butterfly pea | Centrosema molle Mart. ex Benth. | CEMO5 |
| soft lupine | Lupinus mollis Heller | LUMO3 |
| soft milkpea | Galactia mollis Michx. | GAMO2 |
| soft prairie clover | Dalea mollissima (Rydb.) Munz | DAMO2 |
| softhairy indigo | Indigofera pilosa Poir. | INPI |
| softleaf mimosa | Mimosa malacophylla Gray | MIMA |
| sola pith plant | Aeschynomene aspera L. | AEAS |
| solitary milkvetch | Astragalus solitarius M.E. Peck | ASSO3 |
| Sonora lupine | Lupinus arizonicus (S. Wats.) S. Wats. ssp. sonorensis Christian & D. Dunn | LUARS5 |
| Sonoran bean | Phaseolus pedicellatus Benth. | PHPE16 |
| Sonoran bird's-foot trefoil | Lotus alamosanus (Rose) Gentry | LOAL2 |
| Sonoran false prairie-clover | Marina orcuttii (S. Wats.) Barneby | MAOR4 |
| Sonoran indigo | Indigofera sphaerocarpa Gray | INSP |
| Sonoran prairie clover | Dalea filiformis Gray | DAFI |
| Sonoran ticktrefoil | Desmodium scopulorum S. Wats. | DESC3 |
| Sophora arizonica | Sophora arizonica S. Wats. ssp. formosa (Kearney & Peebles) Yakovlev | SOARF |
| Sophora arizonica | Sophora arizonica S. Wats. var. formosa (Kearney & Peebles) Tsoong | SOARF2 |
| Sophora arizonica | Sophora formosa Kearney & Peebles | SOFO |
| Sophora chrysophylla | Sophora chrysophylla (Salisb.) Seem. ssp. circularis Chock | SOCHC |
| Sophora chrysophylla | Sophora chrysophylla (Salisb.) Seem. ssp. glabrata (Gray) Chock | SOCHG |
| Sophora chrysophylla | Sophora chrysophylla (Salisb.) Seem. ssp. unifoliata (Rock) Chock | SOCHU |
| Sophora chrysophylla | Sophora chrysophylla (Salisb.) Seem. var. elliptica Chock | SOCHE2 |
| Sophora chrysophylla | Sophora chrysophylla (Salisb.) Seem. var. glabrata (Gray) Chock | SOCHG3 |
| Sophora chrysophylla | Sophora chrysophylla (Salisb.) Seem. var. grisea (O. Deg. & Sherff) Chock | SOCHG4 |
| Sophora chrysophylla | Sophora chrysophylla (Salisb.) Seem. var. kanaioensis Chock | SOCHK3 |
| Sophora chrysophylla | Sophora chrysophylla (Salisb.) Seem. var. kauensis Chock | SOCHK4 |
| Sophora chrysophylla | Sophora chrysophylla (Salisb.) Seem. var. lanaiensis Chock | SOCHL2 |
| Sophora chrysophylla | Sophora chrysophylla (Salisb.) Seem. var. makuaensis Chock | SOCHM |
| Sophora chrysophylla | Sophora chrysophylla (Salisb.) Seem. var. ovata Chock | SOCHO2 |
| Sophora chrysophylla | Sophora chrysophylla (Salisb.) Seem. var. unifoliata (Rock) Chock | SOCHU2 |
| Sophora leachiana | Vexibia leachiana (M.E. Peck) W.A. Weber | VELE3 |
| Sophora nuttalliana | Sophora sericea Nutt. | SOSE8 |
| Sophora nuttalliana | Vexibia nuttalliana (B.L. Turner) W.A. Weber | VENU3 |
| Sophora stenophylla | Vexibia stenophylla (Gray) W.A. Weber | VEST3 |
| Sophora tomentosa var. littoralis | Sophora littoralis Schrad. | SOLI2 |
| Sophora tomentosa var. littoralis | Sophora tomentosa L. ssp. littoralis (Schrad.) Yakovlev | SOTOL2 |
| Sophora tomentosa var. occidentalis | Sophora tomentosa L. ssp. occidentalis (L.) Brummitt | SOTOO2 |
| Sophora tomentosa var. truncata | Sophora tomentosa L. ssp. bahamensis Yakovlev | SOTOB |
| South African hoarypea | Tephrosia noctiflora Bojer ex Baker | TENO2 |
| South Wales wattle | Acacia parramattensis Tindale | ACPA81 |
| southern medick | Medicago turbinata (L.) All. | METU |
| southern pea | Vigna unguiculata (L.) Walp. ssp. unguiculata | VIUNU |
| Soxman's milkvetch | Astragalus soxmaniorum Lundell | ASSO5 |
| soybean | Glycine max (L.) Merr. | GLMA4 |
| soybean | Glycine Willd. | GLYCI |
| Spalding's milkvetch | Astragalus spaldingii Gray | ASSP4 |
| Spanish broom | Spartium junceum L. | SPJU2 |
| Spanish clover | Trifolium gemellum Pourret ex Willd. | TRGE5 |
| Spanish lupine | Lupinus hispanicus Boiss. & Reut. | LUHI7 |
| Spanish lupine | Lupinus hispanicus Boiss. & Reut. ssp. bicolor (Merino) Gladst. | LUHIB |
| spearwood | Acacia doratoxylon A. Cunn. | ACDO2 |
| sphaerophysa | Sphaerophysa DC. | SPHAE2 |
| Sphaerophysa salsula | Phaca salsula Pallas | PHSA7 |
| Sphaerophysa salsula | Swainsona salsula (Pallas) Taubert | SWSA2 |
| sphenostylis | Sphenostylis E. Meyer | SPHEN7 |
| Sphenostylis stenocarpa | Dolichos stenocarpus Hochst. ex A. Rich. | DOST2 |
| Sphenostylis stenocarpa | Vigna ornata Welw. ex Baker | VIOR4 |
| sphinctospermum | Sphinctospermum Rose | SPHIN |
| Sphinctospermum constrictum | Tephrosia constricta S. Wats. | TECO10 |
| spider lupine | Lupinus benthamii Heller | LUBE |
| spider lupine | Lupinus benthamii Heller var. benthamii | LUBEB |
| spider lupine | Lupinus benthamii Heller var. opimus C.P. Sm. | LUBEO |
| spiked hoarypea | Tephrosia spicata (Walt.) Torr. & Gray | TESP |
| spiked ticktrefoil | Desmodium cinerascens Gray | DECI2 |
| spiked wild indigo | Baptisia albescens Small | BAAL3 |
| spineless wattle | Acacia muricata (L.) Willd. | ACMU |
| spiny holdback | Caesalpinia spinosa (Molina) Kuntze | CASP11 |
| spiny kidneywood | Eysenhardtia spinosa Engelm. | EYSP |
| spiny milkvetch | Astragalus kentrophyta Gray | ASKE |
| spiny milkvetch | Astragalus kentrophyta Gray var. danaus (Barneby) Barneby | ASKED |
| spiny milkvetch | Astragalus kentrophyta Gray var. jessiae (M.E. Peck) Barneby | ASKEJ |
| spiny milkvetch | Astragalus kentrophyta Gray var. kentrophyta | ASKEK |
| spiny milkvetch | Astragalus kentrophyta Gray var. ungulatus M.E. Jones | ASKEU |
| spiny restharrow | Ononis spinosa L. | ONSP |
| spinytooth clover | Trifolium mucronatum Willd. ex Spreng. ssp. lacerum (Greene) J. Gillett | TRMUL |
| spotted bean | Phaseolus maculatus Scheele | PHMA17 |
| spotted lupine | Lupinus maculatus Rydb. | LUMA3 |
| spotted medick | Medicago arabica (L.) Huds. | MEAR |
| sprawling hoarypea | Tephrosia hispidula (Michx.) Pers. | TEHI2 |
| spreadfruit goldenbanner | Thermopsis divaricarpa A. Nels. | THDI4 |
| spreading false prairie-clover | Marina diffusa (Moric.) Barneby | MADI4 |
| Spring Mountain milkvetch | Astragalus remotus (M.E. Jones) Barneby | ASRE4 |
| spring vetch | Vicia lathyroides L. | VILA2 |
| spring-vetch | Lathyrus vernus (L.) Bernh. | LAVE7 |
| spurred butterfly pea | Centrosema virginianum (L.) Benth. | CEVI2 |
| St. John's bread | Ceratonia siliqua L. | CESI3 |
| St. Thomas bean | Entada phaseoloides (L.) Merr. | ENPH |
| St. Thomas tree | Bauhinia tomentosa L. | BATO |
| Stahl's valamuerto | Senna pendula (Humb. & Bonpl. ex Willd.) Irwin & Barneby var. stahlii (Urban) Irwin & Barneby | SEPES |
| stahlia | Stahlia Bello | STAHL |
| stalkpod locoweed | Oxytropis podocarpa Gray | OXPO |
| standing milkvetch | Astragalus laxmannii Jacq. var. tananaicus (Hult?n) Barneby & Welsh | ASLAT3 |
| star clover | Trifolium stellatum L. | TRST13 |
| starveling milkvetch | Astragalus jejunus S. Wats. | ASJE2 |
| starveling milkvetch | Astragalus jejunus S. Wats. var. articulatus Dorn | ASJEA |
| starveling milkvetch | Astragalus jejunus S. Wats. var. jejunus | ASJEJ |
| stemless dwarf lupine | Lupinus caespitosus Nutt. | LUCA3 |
| stemless dwarf lupine | Lupinus caespitosus Nutt. var. caespitosus | LUCAC2 |
| Steudner's clover | Trifolium steudneri Schweinf. | TRST14 |
| stickpea | Calliandra Benth. | CALLI |
| stickpea | Calliandra haematocephala Hassk. | CAHA31 |
| sticky jointvetch | Aeschynomene viscidula Michx. | AEVI |
| sticky wattle | Acacia howittii F. Muell. | ACHO5 |
| stiff pea | Lathyrus rigidus White | LARI |
| stiff ticktrefoil | Desmodium obtusum (Muhl. ex Willd.) DC. | DEOB5 |
| stinging annual lupine | Lupinus hirsutissimus Benth. | LUHI3 |
| stinking milkvetch | Astragalus praelongus Sheldon | ASPR5 |
| stinking milkvetch | Astragalus praelongus Sheldon var. lonchopus Barneby | ASPRL |
| stinking milkvetch | Astragalus praelongus Sheldon var. praelongus | ASPRP2 |
| stinkingtoe | Hymenaea courbaril L. | HYCO |
| stinkwood | Piscidia carthagenensis Jacq. | PICA5 |
| strand tangantangan | Schleinitzia fosbergii L.I.Nevling & Ch.J.Niezgoda | SCFO2 |
| strand tangantangan | Schleinitzia Warb. | SCHLE3 |
| strawberry clover | Trifolium fragiferum L. | TRFR2 |
| streambank bird's-foot trefoil | Lotus oblongifolius (Benth.) Greene | LOOB2 |
| streambank bird's-foot trefoil | Lotus oblongifolius (Benth.) Greene var. cupreus (Greene) Ottley | LOOBC |
| streambank bird's-foot trefoil | Lotus oblongifolius (Benth.) Greene var. oblongifolius | LOOBO2 |
| striated broom | Cytisus striatus (Hill) Rothm. | CYST7 |
| strigose bird's-foot trefoil | Lotus strigosus (Nutt.) Greene | LOST4 |
| strigose bird's-foot trefoil | Lotus strigosus (Nutt.) Greene var. hirtellus (Greene) Ottley | LOSTH |
| strigose bird's-foot trefoil | Lotus strigosus (Nutt.) Greene var. strigosus | LOSTS2 |
| strigose bird's-foot trefoil | Lotus strigosus (Nutt.) Greene var. tomentellus (Greene) Isely | LOSTT |
| strongylodon | Strongylodon Vogel | STRON |
| Strophostyles helvola | Strophostyles helvula (L.) Ell. var. missouriensis (S. Wats.) Britt. | STHEM |
| Strophostyles helvola | Strophostyles helvula (L.) Ell. [orthographic variant] | STHE4 |
| Strophostyles leiosperma | Phaseolus leiospermus Torr. & Gray | PHLE15 |
| Strophostyles leiosperma | Strophostyles pauciflora (Benth.) S. Wats. | STPA15 |
| Strophostyles umbellata | Strophostyles umbellata (Muhl. ex Willd.) Britt. var. paludigena Fern. | STUMP |
| stryphnodendron | Stryphnodendron adstringens (C. Martius) Cov. | STAD |
| stryphnodendron | Stryphnodendron barbadetimam (Vell. Conc.) C. Martius | STBA6 |
| stryphnodendron | Stryphnodendron C. Martius | STRYP |
| Sturt's cassia | Cassia sturtii R. Br. | CAST47 |
| Stylosanthes biflora | Stylosanthes biflora (L.) B.S.P. var. hispidissima (Michx.) Pollard & Ball | STBIH |
| Stylosanthes biflora | Stylosanthes floridana Blake | STFL3 |
| Stylosanthes biflora | Stylosanthes riparia Kearney | STRI3 |
| Stylosanthes biflora | Stylosanthes riparia Kearney var. setifera Fern. | STRIS |
| Stylosanthes erecta | Stylosanthes gracilis Kunth | STGR12 |
| Stylosanthes erecta | Stylosanthes guineensis Schumacher | STGU2 |
| Stylosanthes fruticosa | Stylosanthes mucronata Willd. | STMU3 |
| Stylosanthes guianensis var. guianensis | Stylosanthes guianensis (Aubl.) Sw. var. subviscosa Benth. | STGUS |
| Stylosanthes montevidensis | Stylosanthes juncea Micheli | STJU3 |
| Styphnolobium affine | Sophora affinis Torr. & Gray | SOAF |
| Styphnolobium japonicum | Sophora japonica L. | SOJA6 |
| subalpine lupine | Lupinus arcticus S. Wats. ssp. subalpinus (Piper & B.L. Robins.) D. Dunn | LUARS2 |
| subterranean clover | Trifolium subterraneum L. | TRSU3 |
| subterranean clover | Trifolium subterraneum L. ssp. brachycalycinum Katzn. & Morley | TRSUB2 |
| subterranean clover | Trifolium subterraneum L. var. yanninicum (Katzn. & Morley) Zohary | TRSUY |
| subterranean Indian breadroot | Pediomelum hypogaeum (Nutt. ex Torr. & Gray) Rydb. | PEHY4 |
| subterranean Indian breadroot | Pediomelum hypogaeum (Nutt. ex Torr. & Gray) Rydb. var. hypogaeum | PEHYH |
| subterranean Indian breadroot | Pediomelum hypogaeum (Nutt. ex Torr. & Gray) Rydb. var. scaposum (Gray) Mahler | PEHYS |
| subterranean Indian breadroot | Pediomelum hypogaeum (Nutt. ex Torr. & Gray) Rydb. var. subulatum (Bush) J. Grimes | PEHYS2 |
| subterranean vetch | Vicia sativa L. ssp. amphicarpa (L.) Batt. | VISAA3 |
| suckling clover | Trifolium dubium Sibthorp | TRDU2 |
| Suksdorf's lupine | Lupinus suksdorfii B.L. Robins. | LUSU4 |
| Suksdorf's milkvetch | Astragalus pulsiferae Gray var. suksdorfii (T.J. Howell) Barneby | ASPUS |
| sulla | Hedysarum coronarium L. | HECO24 |
| sulphur clover | Trifolium ochroleucum Huds. | TROC6 |
| sulphur lupine | Lupinus sulphureus Dougl. ex Hook. | LUSU5 |
| summer farewell | Dalea pinnata (J.F. Gmel.) Barneby | DAPI2 |
| summer farewell | Dalea pinnata (J.F. Gmel.) Barneby var. pinnata | DAPIP |
| summer farewell | Dalea pinnata (J.F. Gmel.) Barneby var. trifoliata (Chapman) Barneby | DAPIT |
| summer lupine | Lupinus formosus Greene | LUFO2 |
| summer lupine | Lupinus formosus Greene var. formosus | LUFOF |
| summer lupine | Lupinus formosus Greene var. robustus C.P. Sm. | LUFOR |
| summer milkvetch | Astragalus hyalinus M.E. Jones | ASHY2 |
| summit lupine | Lupinus apertus Heller | LUAP |
| sundial lupine | Lupinus perennis L. | LUPE3 |
| sundial lupine | Lupinus perennis L. ssp. gracilis (Nutt.) D. Dunn | LUPEG |
| sundial lupine | Lupinus perennis L. ssp. perennis | LUPEP |
| sundial lupine | Lupinus perennis L. ssp. perennis var. occidentalis S. Wats. | LUPEO2 |
| sundial lupine | Lupinus perennis L. ssp. perennis var. perennis | LUPEP3 |
| sunn hemp | Crotalaria juncea L. | CRJU |
| sunset lupine | Lupinus horizontalis Heller | LUHO3 |
| sunset lupine | Lupinus horizontalis Heller var. horizontalis | LUHOH |
| sunset lupine | Lupinus horizontalis Heller var. platypetalus C.P. Sm. | LUHOP |
| supine bean | Macroptilium supinum (Wiggins & Rollins) A. Delgado | MASU18 |
| Surinamese stickpea | Calliandra surinamensis Benth. | CASU33 |
| Susanville milkvetch | Astragalus inversus M.E. Jones | ASIN7 |
| sutherlandia | Sutherlandia R. Br. | SUTHE |
| Swartz's jamaican broom | Chamaecrista glandulosa (L.) Greene var. swartzii (Wikstr.) Irwin & Barneby | CHGLS |
| Swartz's snoutbean | Rhynchosia swartzii (Vail) Urban | RHSW |
| sweet acacia | Acacia farnesiana (L.) Willd. | ACFA |
| sweet acacia | Acacia suaveolens (Sm.) Willd. | ACSU9 |
| sweetclover | Melilotus P. Mill. | MELIL |
| sweetclover | Melilotus suaveolens Ledeb. | MESU12 |
| sweetclover vetch | Vicia pulchella Kunth | VIPU2 |
| sweetpea | Lathyrus odoratus L. | LAOD |
| sweetscented pigeonwings | Clitoria fragrans Small | CLFR2 |
| sweetvetch | Hedysarum L. | HEDYS |
| sweetvetch | Hedysarum mongolicum Turcz. | HEMO11 |
| sweetvetch | Hedysarum scoparium Fisch. & Mey. | HESC16 |
| sword jackbean | Canavalia gladiata (Jacq.) DC. | CAGL15 |
| Sydney golden wattle | Acacia longifolia (Andr.) Willd. | ACLO |
| Syrian mesquite | Prosopis farcta (Banks & Soland.) J.F. Macbr. | PRFA2 |
| Syrian pea | Pisum syriacum (A. Berger) Lehman | PISY2 |
| tabardillo | Calliandra californica Benth. | CACA82 |
| tagasaste | Chamaecytisus palmensis (Christ) Bisby & K. Nicholls [excluded] | CHPA44 |
| Tahitian kidneywood | Eysenhardtia orthocarpa (Gray) S. Wats. | EYOR |
| tailcup lupine | Lupinus caudatus Kellogg | LUCA |
| tailcup lupine | Lupinus caudatus Kellogg ssp. caudatus | LUCAC3 |
| tailed nicker | Caesalpinia caudata (Gray) Fisher | CACA26 |
| Taiwan kudzu | Pueraria montana (Lour.) Merr. var. montana | PUMOM |
| talh | Acacia seyal Del. | ACSE7 |
| tall albizia | Albizia procera (Roxb.) Benth. | ALPR |
| tall lespedeza | Lespedeza stuevei Nutt. | LEST5 |
| tall milkvetch | Astragalus altus Woot. & Standl. | ASAL8 |
| tall silky lupine | Lupinus elatus I.M. Johnston | LUEL |
| tall spiny milkvetch | Astragalus kentrophyta Gray var. elatus S. Wats. | ASKEE |
| tall yellow sweetclover | Melilotus altissimus Thuill. | MEAL3 |
| tamarind | Tamarindus indica L. | TAIN2 |
| tamarind | Tamarindus L. | TAMAR |
| tamarugo | Prosopis tamarugo F. Philippi | PRTA2 |
| Tampa prairie clover | Dalea adenopoda (Rydb.) Isely | DAAD |
| Tangier pea | Lathyrus tingitanus L. | LATI |
| taralea | Taralea Aublet | TARAL |
| Taralea oppositifolia | Dipteryx oppositifolia (Aublet) Willd. | DIOP2 |
| tarwi | Lupinus mutabilis Sweet | LUMU8 |
| tawny pea | Pisum fulvum Sibthorp & Sm. | PIFU |
| teasel clover | Trifolium retusum L. | TRRE10 |
| telegraph-plant | Codariocalyx motorius (Houtt.) H. Ohashi | COMO13 |
| Tembien clover | Trifolium tembense Fresen. | TRTE11 |
| Tennessee milkvetch | Astragalus tennesseensis Gray ex Chapman | ASTE7 |
| tepary bean | Phaseolus acutifolius Gray | PHAC |
| tepary bean | Phaseolus acutifolius Gray var. acutifolius | PHACA2 |
| tepary bean | Phaseolus acutifolius Gray var. latifolius Freeman | PHACL |
| tepary bean | Phaseolus acutifolius Gray var. tenuifolius Gray | PHACT |
| Tephrosia ?floridana | Cracca floridana Vail | CRFL15 |
| Tephrosia ?floridana | Cracca intermedia Small | CRIN12 |
| Tephrosia ?floridana | Cracca smallii Vail | CRSM |
| Tephrosia ?floridana | Tephrosia intermedia auct. non Graham [misapplied] | TEIN3 |
| Tephrosia angustissima var. angustissima | Cracca angustissima (Shuttlw. ex Chapman) Kuntze | CRAN13 |
| Tephrosia angustissima var. angustissima | Tephrosia purpurea auct. non (L.) Pers. [misapplied] | TEPU4 |
| Tephrosia angustissima var. corallicola | Cracca corallicola Small | CRCO25 |
| Tephrosia angustissima var. corallicola | Tephrosia corallicola (Small) L?onard | TECO4 |
| Tephrosia angustissima var. curtissii | Cracca curtissii Small ex Rydb. | CRCU3 |
| Tephrosia angustissima var. curtissii | Tephrosia curtissii (Small ex Rydb.) Shinners | TECU2 |
| Tephrosia angustissima var. curtissii | Tephrosia seminole Shinners | TESE |
| Tephrosia candida | Cracca candida (DC.) Kunth | CRCA10 |
| Tephrosia candida | Xiphocarpus candidus (DC.) Endl. | XICA |
| Tephrosia chrysophylla | Cracca carpenteri Rydb. | CRCA12 |
| Tephrosia chrysophylla | Cracca chapmanii (Vail) Small | CRCH4 |
| Tephrosia chrysophylla | Cracca chrysophylla (Pursh) Kuntze | CRCH5 |
| Tephrosia chrysophylla | Tephrosia carpenteri (Rydb.) Killip | TECA13 |
| Tephrosia cinerea | Cracca cinerea (L.) Morong | CRCI5 |
| Tephrosia florida | Cracca ambigua (M.A. Curtis) Kuntze | CRAM8 |
| Tephrosia florida | Cracca gracillima (B.L. Robins.) Heller | CRGR5 |
| Tephrosia florida | Galega florida F.G. Dietr. | GAFL5 |
| Tephrosia florida | Tephrosia ambigua (M.A. Curtis) Chapman | TEAM2 |
| Tephrosia florida | Tephrosia ambigua (M.A. Curtis) Kuntze var. gracillima B.L. Robins. | TEAMG |
| Tephrosia florida | Tephrosia florida (F.G. Dietr.) C.E. Wood var. gracillima (B.L. Robins.) Shinners | TEFLG |
| Tephrosia hispidula | Cracca hispidula (Michx.) Kuntze | CRHI5 |
| Tephrosia hispidula | Tephrosia elegans Nutt. | TEEL3 |
| Tephrosia leiocarpa | Cracca leiocarpa (Gray) Kuntze | CRLE9 |
| Tephrosia leiocarpa | Tephrosia affinis S. Wats. | TEAF |
| Tephrosia leiocarpa | Tephrosia viridis M.E. Jones | TEVI3 |
| Tephrosia mohrii | Cracca mohrii Rydb. | CRMO8 |
| Tephrosia onobrychoides | Cracca angustifolia (Featherman) Pennell | CRAN7 |
| Tephrosia onobrychoides | Cracca onobrychoides (Nutt.) Kuntze | CRON |
| Tephrosia onobrychoides | Cracca texana Rydb. | CRTE7 |
| Tephrosia onobrychoides | Tephrosia angustifolia Featherman | TEAN3 |
| Tephrosia onobrychoides | Tephrosia multiflora Featherman | TEMU4 |
| Tephrosia onobrychoides | Tephrosia texana (Rydb.) Cory | TETE6 |
| Tephrosia potosina | Cracca potosina (Brandeg.) Standl. | CRPO12 |
| Tephrosia purpurea | Cracca purpurea L. | CRPU12 |
| Tephrosia purpurea | Tephrosia piscatoria (Dry.) Pers. | TEPI |
| Tephrosia rugelii | Cracca rugelii (Shuttlw. ex B.L. Robins.) Heller | CRRU6 |
| Tephrosia senna | Cracca cathartica (Sess? & Moc.) Britt. & Millsp. | CRCA18 |
| Tephrosia senna | Tephrosia cathartica (Sesse & Moc.) Urb. | TECA15 |
| Tephrosia sinapou | Tephrosia toxicaria (Sw.) Pers. | TETO2 |
| Tephrosia spicata | Cracca flexuosa (Vail) Heller | CRFL8 |
| Tephrosia spicata | Cracca spicata (Walt.) Kuntze | CRSP7 |
| Tephrosia spicata | Galega spicata Walt. | GASP12 |
| Tephrosia spicata | Tephrosia flexuosa (Vail) Chapman | TEFL3 |
| Tephrosia spicata | Tephrosia spicata (Walt.) Torr. & Gray var. semitonsa Fern. | TESPS |
| Tephrosia thurberi | Cracca thurberi Rydb. | CRTH5 |
| Tephrosia vicioides | Tephrosia tenella Gray | TETE |
| Tephrosia villosa ssp. villosa | Tephrosia incana (Roxb.) Graham ex Wight & Arn. | TEIN4 |
| Tephrosia virginiana | Cracca latidens Small | CRLA6 |
| Tephrosia virginiana | Cracca virginiana L. | CRVI7 |
| Tephrosia virginiana | Tephrosia latidens (Small) Standl. | TELA4 |
| Tephrosia virginiana | Tephrosia virginiana (L.) Pers. var. glabra Nutt. | TEVIG |
| Tephrosia virginiana | Tephrosia virginiana (L.) Pers. var. holosericea (Nutt.) Torr. & Gray | TEVIH |
| teramnus | Teramnus P. Br. | TERAM |
| Teton lupine | Lupinus wyethii S. Wats. ssp. tetonensis (E. Nels.) Cox & D. Dunn | LUWYT |
| tetragonolobus | Tetragonolobus Scop. | TETRA18 |
| Tetragonolobus purpureus | Lotus tetragonolobus L. | LOTE8 |
| Texas babybonnets | Coursetia axillaris Coult. & Rose | COAX |
| Texas bluebonnet | Lupinus subcarnosus Hook. | LUSU |
| Texas ebony | Ebenopsis Britt. & Rose | EBENO |
| Texas ebony | Ebenopsis ebano (Berl.) Barneby & Grimes | EBEB |
| Texas holdback | Pomaria austrotexana B. Simpson | POAU15 |
| Texas kidneywood | Eysenhardtia texana Scheele | EYTE |
| Texas lespedeza | Lespedeza texana Britt. | LETE2 |
| Texas lupine | Lupinus texensis Hook. | LUTE |
| Texas milkpea | Galactia texana (Scheele) Gray | GATE |
| Texas mimosa | Mimosa texana (Gray) Small | MITE6 |
| Texas paloverde | Parkinsonia texana (Gray) S. Wats. | PATE10 |
| Texas paloverde | Parkinsonia texana (Gray) S. Wats. var. macra (I.M. Johnston) Isely | PATEM |
| Texas paloverde | Parkinsonia texana (Gray) S. Wats. var. texana | PATET2 |
| Texas Plains Indian breadroot | Pediomelum latestipulatum (Shinners) Mahler | PELA18 |
| Texas Plains Indian breadroot | Pediomelum latestipulatum (Shinners) Mahler var. appressum (D.J. Ockendon) Gandhi & L.E. Brown | PELAA |
| Texas Plains Indian breadroot | Pediomelum latestipulatum (Shinners) Mahler var. latestipulatum | PELAL2 |
| Texas redbud | Cercis canadensis L. var. texensis (S. Wats.) M. Hopkins | CECAT |
| Texas sensitive pea | Chamaecrista flexuosa (L.) Greene | CHFL4 |
| Texas sensitive pea | Chamaecrista flexuosa (L.) Greene var. texana (Buckl.) Irwin & Barneby | CHFLT |
| Texas snoutbean | Rhynchosia senna Gillies ex Hook. | RHSE4 |
| Texas snoutbean | Rhynchosia senna Gillies ex Hook. var. texana (Torr. & Gray) M.C. Johnston | RHSET |
| Texasplume | Bauhinia lunarioides Gray ex S. Wats. | BALU |
| Thermopsis californica var. argentata | Thermopsis argentata Greene | THAR3 |
| Thermopsis californica var. argentata | Thermopsis gracilis T.J. Howell var. argentata (Greene) Jepson | THGRA |
| Thermopsis californica var. argentata | Thermopsis macrophylla Hook. & Arn. var. argentata (Greene) Jepson | THMAA2 |
| Thermopsis californica var. californica | Thermopsis macrophylla Hook. & Arn. var. velutina (Greene) Larisey | THMAV |
| Thermopsis californica var. semota | Thermopsis macrophylla Hook. & Arn. ssp. semota (Jepson) Beauchamp | THMAS2 |
| Thermopsis californica var. semota | Thermopsis macrophylla Hook. & Arn. var. semota Jepson | THMAS |
| Thermopsis divaricarpa | Thermopsis montana Nutt. var. divaricarpa (A. Nels.) Dorn | THMOD |
| Thermopsis divaricarpa | Thermopsis pinetorum Greene | THPI5 |
| Thermopsis divaricarpa | Thermopsis rhombifolia (Nutt. ex Pursh) Nutt. ex Richards. var. divaricarpa (A. Nels.) Isely | THRHD |
| Thermopsis fraxinifolia | Thermopsis mollis (Michx.) M.A. Curtis ex Gray var. fraxinifolia (Nutt. ex M.A. Curtis) Isely | THMOF2 |
| Thermopsis gracilis var. gracilis | Thermopsis gracilis T.J. Howell var. venosa (Eastw.) Jepson | THGRV |
| Thermopsis gracilis var. gracilis | Thermopsis macrophylla Hook. & Arn. var. venosa (Eastw.) Isely | THMAV2 |
| Thermopsis gracilis var. gracilis | Thermopsis montana Nutt. var. venosa (Eastw.) Jepson | THMOV2 |
| Thermopsis gracilis var. gracilis | Thermopsis subglaber Henderson | THSU3 |
| Thermopsis gracilis var. ovata | Thermopsis montana Nutt. var. ovata (B.L. Robins. ex Piper) St. John | THMOO2 |
| Thermopsis gracilis var. ovata | Thermopsis ovata B.L. Robins. ex Piper | THOV2 |
| Thermopsis gracilis var. ovata | Thermopsis rhombifolia (Nutt. ex Pursh) Nutt. ex Richards. var. ovata (B.L. Robins. ex Piper) Isely | THRHO |
| Thermopsis macrophylla | Thermopsis macrophylla Hook. & Arn. var. agnina J.T. Howell | THMAA |
| Thermopsis macrophylla | Thermopsis macrophylla Hook. & Arn. var. macrophylla Hook. & Arn. [superfluous autonym] | THMAM3 |
| Thermopsis mollis | Thermopsis hugeri (Small) Small | THHU3 |
| Thermopsis montana var. hitchcockii | Thermopsis macrophylla Hook. & Arn. var. hitchcockii Isely | THMAH |
| Thermopsis montana var. montana | Thermopsis rhombifolia (Nutt. ex Pursh) Nutt. ex Richards. var. montana (Nutt.) Isely | THRHM |
| Thermopsis rhombifolia | Thermopsis arenosa A. Nels. | THAR7 |
| Thermopsis rhombifolia | Thermopsis rhombifolia (Nutt. ex Pursh) Nutt. ex Richards. var. annulocarpa (A. Nels.) L.O. Williams | THRHA |
| Thermopsis rhombifolia | Thermopsis rhombifolia (Nutt. ex Pursh) Nutt. ex Richards. var. arenosa (A. Nels.) Larisey | THRHA2 |
| Thermopsis villosa | Thermopsis caroliniana M.A. Curtis | THCA5 |
| thicket bean | Phaseolus polystachios (L.) B.S.P. | PHPO2 |
| thicket bean | Phaseolus polystachios (L.) B.S.P. var. polystachios | PHPOP |
| thicket bean | Phaseolus polystachios (L.) B.S.P. var. sinuatus (Nutt. ex Torr. & Gray) R. Marechal, J.M. Mascherpa & F. Stainier | PHPOS |
| thicket rattlebox | Crotalaria virgulata Klotzsch | CRVI14 |
| thickpod milkvetch | Astragalus pachypus Greene | ASPA9 |
| thickpod milkvetch | Astragalus pachypus Greene var. pachypus | ASPAP5 |
| thimble clover | Trifolium microdon Hook. & Arn. | TRMI5 |
| thinleaf pea | Lathyrus holochlorus (Piper) C.L. Hitchc. | LAHO2 |
| Thompson's clover | Trifolium thompsonii Morton | TRTH2 |
| Thompson's dalea | Psorothamnus thompsoniae (Vail) Welsh & Atwood | PSTH |
| Thompson's dalea | Psorothamnus thompsoniae (Vail) Welsh & Atwood var. thompsoniae | PSTHT |
| Thompson's peteria | Peteria thompsoniae S. Wats. | PETH5 |
| thorn wattle | Acacia continua Benth. | ACCO18 |
| threadstalk milkvetch | Astragalus speirocarpus Gray | ASSP7 |
| threeflower ticktrefoil | Desmodium triflorum (L.) DC. | DETR4 |
| threeleaf derris | Derris trifoliata Lour. | DETR5 |
| threeleaf indigo | Indigofera trifoliata L. | INTR2 |
| Thunberg's lespedeza | Lespedeza thunbergii (DC.) Nakai | LETH4 |
| Thurber's diphysa | Diphysa thurberi (Gray) Rydb. | DITH |
| Thurber's hoarypea | Tephrosia thurberi (Rydb.) C.E. Wood | TETH |
| Thurber's milkvetch | Astragalus thurberi Gray | ASTH |
| Tibet milkvetch | Astragalus tibetanus Benth. ex Bunge | ASTI5 |
| tick trefoil | Codariocalyx Hassk. | CODAR |
| ticktrefoil | Desmodium Desv. | DESMO |
| ticktrefoil | Desmodium sericophyllum Schldl. | DESE2 |
| Tidestrom's lupine | Lupinus tidestromii Greene | LUTI |
| Tidestrom's lupine | Lupinus tidestromii Greene var. layneae (Eastw.) Munz | LUTIL |
| Tidestrom's lupine | Lupinus tidestromii Greene var. tidestromii | LUTIT |
| Tidestrom's milkvetch | Astragalus tidestromii (Rydb.) Clokey | ASTI |
| Tiehm's milkvetch | Astragalus tiehmii Barneby | ASTI3 |
| Tifton burclover | Medicago rigidula (L.) All. | MERI3 |
| tiger's claw | Erythrina variegata L. | ERVA7 |
| tiger's claw | Erythrina variegata L. var. orientalis L. | ERVAO |
| timber milkvetch | Astragalus miser Dougl. | ASMI9 |
| timber milkvetch | Astragalus miser Dougl. var. crispatus (M.E. Jones) Cronq. | ASMIC |
| timber milkvetch | Astragalus miser Dougl. var. miser | ASMIM4 |
| timber milkvetch | Astragalus miser Dougl. var. oblongifolius (Rydb.) Cronq. | ASMIO |
| timber milkvetch | Astragalus miser Dougl. var. serotinus (Gray ex Cooper) Barneby | ASMIS |
| timber milkvetch | Astragalus miser Dougl. var. tenuifolius (Nutt.) Barneby | ASMIT |
| tiny pea | Lathyrus pusillus Ell. | LAPU3 |
| tiny vetch | Vicia hirsuta (L.) S.F. Gray | VIHI |
| tipa | Tipuana tipu (Benth.) Kuntze | TITI2 |
| Toano milkvetch | Astragalus toanus M.E. Jones | ASTO2 |
| Toano milkvetch | Astragalus toanus M.E. Jones var. scidulus Welsh & Atwood | ASTOS |
| Toano milkvetch | Astragalus toanus M.E. Jones var. toanus | ASTOT |
| tomcat clover | Trifolium willdenowii Spreng. | TRWI |
| tomentose gopherweed | Baptisia lanceolata (Walt.) Ell. var. tomentosa (Larisey) Isely | BALAT |
| tonka bean | Dipteryx odorata (Aublet) Willd. | DIOD2 |
| Tonopah milkvetch | Astragalus pseudiodanthus Barneby | ASPS |
| Toquima milkvetch | Astragalus toquimanus Barneby | ASTO3 |
| tornillo | Prosopis reptans Benth. | PRRE2 |
| tornillo | Prosopis reptans Benth. var. cinerascens (Gray) Burkart | PRREC |
| Torrey's milkvetch | Astragalus calycosus Torr. ex S. Wats. | ASCA9 |
| Torrey's milkvetch | Astragalus calycosus Torr. ex S. Wats. var. calycosus | ASCAC5 |
| Torrey's milkvetch | Astragalus calycosus Torr. ex S. Wats. var. monophyllidius (Rydb.) Barneby | ASCAM2 |
| Torrey's milkvetch | Astragalus calycosus Torr. ex S. Wats. var. scaposus (Gray) M.E. Jones | ASCAS |
| Torrey's pea | Lathyrus torreyi Gray | LATO |
| Townsville stylo | Stylosanthes humilis Kunth | STHU4 |
| Tracy's lupine | Lupinus tracyi Eastw. | LUTR |
| Tracy's pea | Lathyrus lanszwertii Kellogg var. tracyi (Bradshaw) Isley | LALAT |
| trailing fenugreek | Trigonella procumbens (Bess.) Reichenb. | TRPR8 |
| trailing indigo | Indigofera hendecaphylla Jacq. | INHE3 |
| trailing lespedeza | Lespedeza procumbens Michx. | LEPR |
| transparent milkvetch | Astragalus diaphanus Dougl. ex Hook. | ASDI2 |
| TransPecos senna | Senna pilosior (B.L. Robins. ex J.F. Macbr.) Irwin & Barneby | SEPI3 |
| Trask's island broom | Lotus dendroideus (Greene) Greene var. traskiae (Eastw. ex Noddin) Isely | LODET |
| Trask's milkvetch | Astragalus traskiae Eastw. | ASTR4 |
| traveler's delight | Apios priceana B.L. Robins. | APPR |
| trefoil | Lotus L. | LOTUS |
| Trelease's milkvetch | Astragalus racemosus Pursh var. treleasei C.L. Porter | ASRAT |
| Trifolium albopurpureum | Trifolium albopurpureum Torr. & Gray var. albopurpureum Torr. & Gray [superfluous autonym] | TRALA2 |
| Trifolium albopurpureum | Trifolium albopurpureum Torr. & Gray var. neolagopus (Loja.) McDermott | TRALN |
| Trifolium albopurpureum | Trifolium columbianum Greene | TRCO10 |
| Trifolium albopurpureum | Trifolium columbianum Greene var. argillorum Jepson | TRCOA |
| Trifolium albopurpureum | Trifolium helleri Kennedy | TRHE2 |
| Trifolium albopurpureum | Trifolium macraei Hook. & Arn. var. albopurpureum (Torr. & Gray) Greene | TRMAA2 |
| Trifolium albopurpureum | Trifolium neolagopus Loja. | TRNE4 |
| Trifolium albopurpureum | Trifolium olivaceum Greene var. columbianum (Greene) Jepson | TROLC |
| Trifolium albopurpureum | Trifolium olivaceum Greene var. griseum Jepson | TROLG |
| Trifolium albopurpureum | Trifolium petrophilum Greene ex Heller | TRPE14 |
| Trifolium andersonii | Trifolium andersonii Gray var. andersonii Gray [superfluous autonym] | TRANA4 |
| Trifolium andersonii ssp. beatleyae | Trifolium andersonii Gray var. beatleyae (J. Gillett) Isely | TRANB2 |
| Trifolium andersonii ssp. monoense | Trifolium andersonii Gray var. monoense (Greene) Isely | TRANM2 |
| Trifolium andersonii ssp. monoense | Trifolium monoense Greene | TRMO9 |
| Trifolium arvense var. arvense | Trifolium arvense L. var. perpusillum DC. | TRARP |
| Trifolium attenuatum | Trifolium bracteolatum Rydb. | TRBR9 |
| Trifolium attenuatum | Trifolium dasyphyllum Torr. & Gray var. stenolobum (Rydb.) McDermott | TRDAS |
| Trifolium attenuatum | Trifolium lilacinum Rydb., non Greene | TRLI3 |
| Trifolium attenuatum | Trifolium petraeum Greene | TRPE13 |
| Trifolium attenuatum | Trifolium stenolobum Rydb. | TRST8 |
| Trifolium aureum | Trifolium agrarium L. p.p. | TRAG |
| Trifolium barbigerum var. andrewsii | Trifolium grayi Loja. | TRGR11 |
| Trifolium barnebyi | Trifolium haydenii Porter var. barnebyi Isely | TRHAB |
| Trifolium bifidum | Trifolium bifidum Gray var. bifidum Gray [superfluous autonym] | TRBIB2 |
| Trifolium bifidum | Trifolium bifidum Gray var. decipiens Greene | TRBID |
| Trifolium brandegeei | Trifolium kingii S. Wats. var. brandegeei (S. Wats.) McDermott | TRKIB |
| Trifolium campestre | Trifolium procumbens L. 1755, non 1753 | TRPR7 |
| Trifolium carolinianum | Trifolium saxicola Small | TRSA3 |
| Trifolium dasyphyllum ssp. anemophilum | Trifolium anemophilum Greene | TRAN9 |
| Trifolium dasyphyllum ssp. anemophilum | Trifolium dasyphyllum Torr. & Gray var. anemophilum (Greene) J.S. Martin ex Isely | TRDAA3 |
| Trifolium dasyphyllum ssp. anemophilum | Trifolium scariosum A. Nels. | TRSC5 |
| Trifolium dasyphyllum ssp. dasyphyllum | Trifolium lividum Rydb. | TRLI6 |
| Trifolium dasyphyllum ssp. uintense | Trifolium dasyphyllum Torr. & Gray var. uintense (Rydb.) Welsh | TRDAU2 |
| Trifolium dasyphyllum ssp. uintense | Trifolium uintense Rydb. | TRUI |
| Trifolium dedeckerae | Trifolium kingii S. Wats. ssp. dedeckerae (J. Gillett) D. Heller | TRKID |
| Trifolium dedeckerae | Trifolium macilentum Greene var. dedeckerae (J. Gillett) Barneby | TRMAD3 |
| Trifolium depauperatum var. amplectens | Trifolium amplectens Torr. & Gray | TRAM14 |
| Trifolium depauperatum var. depauperatum | Trifolium depauperatum Desv. var. laciniatum (Greene) Jepson | TRDEL |
| Trifolium depauperatum var. diversifolium | Trifolium amplectens Torr. & Gray var. hydrophilum (Greene) Jepson | TRAMH |
| Trifolium depauperatum var. diversifolium | Trifolium depauperatum Desv. var. hydrophilum (Greene) J.S. Martin ex Isely | TRDEH |
| Trifolium depauperatum var. stenophyllum | Trifolium amplectens Torr. & Gray var. truncatum (Greene) Jepson | TRAMT |
| Trifolium depauperatum var. stenophyllum | Trifolium depauperatum Desv. var. truncatum (Greene) McDermott ex Isely | TRDET |
| Trifolium depauperatum var. stenophyllum | Trifolium stenophyllum Nutt. | TRST9 |
| Trifolium depauperatum var. stenophyllum | Trifolium truncatum (Greene) Greene | TRTR6 |
| Trifolium dichotomum | Trifolium albopurpureum Torr. & Gray var. dichotomum (Hook. & Arn.) Isely | TRALD |
| Trifolium dichotomum | Trifolium dichotomum Hook. & Arn. var. turbinatum Jepson | TRDIT |
| Trifolium dichotomum | Trifolium macraei Hook. & Arn. var. dichotomum (Hook. & Arn.) Brewer ex S. Wats. | TRMAD2 |
| Trifolium echinatum var. echinatum | Trifolium supinum Savi | TRSU10 |
| Trifolium eriocephalum | Trifolium eriocephalum Nutt. var. eriocephalum Nutt. [superfluous autonym] | TRERE3 |
| Trifolium eriocephalum ssp. arcuatum | Trifolium arcuatum Piper | TRAR5 |
| Trifolium eriocephalum ssp. arcuatum | Trifolium eriocephalum Nutt. var. piperi J.S. Martin | TRERP2 |
| Trifolium eriocephalum ssp. cusickii | Trifolium eriocephalum Nutt. var. cusickii (Piper) J.S. Martin | TRERC4 |
| Trifolium eriocephalum ssp. cusickii | Trifolium eriocephalum Nutt. var. harneyense (T.J. Howell) McDermott | TRERH |
| Trifolium eriocephalum ssp. eriocephalum | Trifolium eriocephalum Nutt. var. butleri Jepson | TRERB |
| Trifolium eriocephalum ssp. villiferum | Trifolium eriocephalum Nutt. var. villiferum (House) J.S. Martin | TRERV4 |
| Trifolium eriocephalum ssp. villiferum | Trifolium villiferum House | TRVI6 |
| Trifolium fragiferum | Trifolium fragiferum L. ssp. bonannii (K. Presl) Soj | TRFRB |
| Trifolium friscanum | Trifolium andersonii Gray var. friscanum Welsh | TRANF2 |
| Trifolium fucatum | Trifolium flavulum Greene | TRFL8 |
| Trifolium fucatum | Trifolium fucatum Lindl. var. gambelii (Nutt.) Jepson | TRFUG |
| Trifolium fucatum | Trifolium fucatum Lindl. var. virescens (Greene) Jepson | TRFUV |
| Trifolium fucatum | Trifolium gambelii Nutt. | TRGA2 |
| Trifolium gracilentum var. gracilentum | Trifolium gracilentum Torr. & Gray var. inconspicuum Fern. | TRGRI |
| Trifolium gracilentum var. palmeri | Trifolium palmeri S. Wats. | TRPA4 |
| Trifolium grandiflorum | Trifolium speciosum Willd. | TRSP11 |
| Trifolium gymnocarpon ssp. gymnocarpon | Trifolium gymnocarpon Nutt. var. subcaulescens (Gray) A. Nels. | TRGYS2 |
| Trifolium gymnocarpon ssp. gymnocarpon | Trifolium nemorale Greene | TRNE6 |
| Trifolium gymnocarpon ssp. gymnocarpon | Trifolium subcaulescens Gray | TRSU8 |
| Trifolium gymnocarpon ssp. plummerae | Trifolium gymnocarpon Nutt. var. plummerae (S. Wats.) J.S. Martin | TRGYP3 |
| Trifolium gymnocarpon ssp. plummerae | Trifolium plummerae S. Wats. | TRPL4 |
| Trifolium haydenii | Trifolium haydenii Porter var. haydenii Porter [superfluous autonym] | TRHAH |
| Trifolium hybridum | Trifolium elegans Savi | TREL12 |
| Trifolium hybridum | Trifolium hybridum L. ssp. elegans (Savi) Aschers. & Graebn. | TRHYE8 |
| Trifolium hybridum | Trifolium hybridum L. var. elegans (Savi) Boiss. | TRHYE |
| Trifolium hybridum | Trifolium hybridum L. var. pratense Rabenh. | TRHYP8 |
| Trifolium incarnatum | Trifolium incarnatum L. var. elatius Gibelli & Belli | TRINE |
| Trifolium kingii ssp. macilentum | Trifolium kingii S. Wats. var. macilentum (Greene) Isely | TRKIM2 |
| Trifolium kingii ssp. macilentum | Trifolium macilentum Greene | TRMA |
| Trifolium latifolium | Trifolium aitonii Rydb. | TRAI |
| Trifolium latifolium | Trifolium howellii S. Wats. var. latifolium (Hook.) McDermott | TRHOL |
| Trifolium latifolium | Trifolium longipes Nutt. var. latifolium Hook. | TRLOL4 |
| Trifolium latifolium | Trifolium orbiculatum Kennedy & McDermott | TROR6 |
| Trifolium lemmonii | Trifolium gymnocarpon Nutt. var. lemmonii (S. Wats.) McDermott | TRGYL |
| Trifolium longipes ssp. atrorubens | Trifolium atrorubens (Greene) House | TRAT2 |
| Trifolium longipes ssp. atrorubens | Trifolium longipes Nutt. var. atrorubens (Greene) Jepson | TRLOA2 |
| Trifolium longipes ssp. atrorubens | Trifolium rusbyi Greene var. atrorubens Greene | TRRUA |
| Trifolium longipes ssp. caurinum | Trifolium caurinum Piper | TRCA15 |
| Trifolium longipes ssp. caurinum | Trifolium covillei House | TRCO11 |
| Trifolium longipes ssp. caurinum | Trifolium longipes Nutt. var. multiovulatum (Henderson) C.L. Hitchc. | TRLOM2 |
| Trifolium longipes ssp. caurinum | Trifolium oreganum T.J. Howell var. multiovulatum Henderson | TRORM |
| Trifolium longipes ssp. caurinum | Trifolium rusbyi Greene ssp. caurinum (Piper) Heller & Zoh. | TRRUC |
| Trifolium longipes ssp. elmeri | Trifolium elmeri Greene | TREL4 |
| Trifolium longipes ssp. elmeri | Trifolium longipes Nutt. var. elmeri (Greene) McDermott | TRLOE2 |
| Trifolium longipes ssp. hansenii | Trifolium hansenii Greene | TRHA2 |
| Trifolium longipes ssp. hansenii | Trifolium longipes Nutt. var. hansenii (Greene) Jepson | TRLOH2 |
| Trifolium longipes ssp. hansenii | Trifolium longipes Nutt. var. nevadense Jepson | TRLON2 |
| Trifolium longipes ssp. multipedunculatum | Trifolium longipes Nutt. var. multipedunculatum (Kennedy) J.S. Martin ex Isely | TRLOM3 |
| Trifolium longipes ssp. multipedunculatum | Trifolium multipedunculatum Kennedy | TRMU6 |
| Trifolium longipes ssp. multipedunculatum | Trifolium rusbyi Greene ssp. multipedunculatum (Kennedy) Heller & Zoh. | TRRUM |
| Trifolium longipes ssp. oreganum | Trifolium longipes Nutt. var. oreganum (T.J. Howell) Isely | TRLOO2 |
| Trifolium longipes ssp. oreganum | Trifolium oreganum T.J. Howell | TROR7 |
| Trifolium longipes ssp. oreganum | Trifolium rusbyi Greene ssp. oreganum (T.J. Howell) Heller & Zoh. | TRRUO |
| Trifolium longipes ssp. pedunculatum | Trifolium longipes Nutt. var. pedunculatum (Rydb.) C.L. Hitchc. | TRLOP3 |
| Trifolium longipes ssp. pedunculatum | Trifolium pedunculatum Rydb. | TRPE15 |
| Trifolium longipes ssp. pygmaeum | Trifolium longipes Nutt. var. brachypus S. Wats. | TRLOB |
| Trifolium longipes ssp. pygmaeum | Trifolium longipes Nutt. var. pygmaeum Gray | TRLOP4 |
| Trifolium longipes ssp. pygmaeum | Trifolium longipes Nutt. var. rusbyi (Greene) Harrington | TRLOR4 |
| Trifolium longipes ssp. pygmaeum | Trifolium rusbyi Greene | TRRU5 |
| Trifolium longipes ssp. reflexum | Trifolium longipes Nutt. var. reflexum A. Nels. | TRLOR |
| Trifolium longipes ssp. reflexum | Trifolium oreganum T.J. Howell var. rydbergii (Greene) McDermott | TRORR |
| Trifolium longipes ssp. reflexum | Trifolium rusbyi Greene ssp. reflexum (A. Nels.) Heller & Zoh. | TRRUR |
| Trifolium longipes ssp. reflexum | Trifolium rydbergii Greene | TRRY80 |
| Trifolium longipes ssp. shastense | Trifolium longipes Nutt. var. shastense (House) Jepson | TRLOS |
| Trifolium longipes ssp. shastense | Trifolium rusbyi Greene ssp. shastense (House) Heller & Zoh. | TRRUS |
| Trifolium longipes ssp. shastense | Trifolium shastense House | TRSH |
| Trifolium lucanicum | Trifolium compactum Post | TRCO16 |
| Trifolium macraei | Trifolium bicephalum Elmer | TRBI3 |
| Trifolium macraei | Trifolium catalinae S. Wats. | TRCA16 |
| Trifolium macraei | Trifolium mercedense Kennedy | TRME7 |
| Trifolium macraei | Trifolium traskiae Kennedy | TRTR11 |
| Trifolium macrocephalum | Lupinaster macrocephalus Pursh | LUMA12 |
| Trifolium macrocephalum | Trifolium macrocephalum (Pursh) Poir. var. caeruleomontanum St. John | TRMAC |
| Trifolium michelianum ssp. balansae | Trifolium balansae Boiss. | TRBA8 |
| Trifolium michelianum ssp. balansae | Trifolium michelianum Savi var. balansae (Boiss.) Andrz. | TRMIB |
| Trifolium microdon | Trifolium microdon Hook. & Arn. var. pilosum Eastw. | TRMIP |
| Trifolium monanthum | Trifolium monanthum Gray var. monanthum Gray [superfluous autonym] | TRMOM3 |
| Trifolium monanthum ssp. grantianum | Trifolium monanthum Gray var. grantianum (Heller) Parish | TRMOG2 |
| Trifolium monanthum ssp. grantianum | Trifolium simulans House | TRSI6 |
| Trifolium monanthum ssp. parvum | Trifolium monanthum Gray var. caulescens Loja. | TRMOC |
| Trifolium monanthum ssp. parvum | Trifolium monanthum Gray var. parvum (Kellogg) McDermott | TRMOP2 |
| Trifolium monanthum ssp. parvum | Trifolium monanthum Gray var. pusillum (Greene) Jepson | TRMOP3 |
| Trifolium monanthum ssp. parvum | Trifolium multicaule M.E. Jones | TRMU4 |
| Trifolium monanthum ssp. parvum | Trifolium pauciflorum Nutt. var. parvum Kellogg | TRPAP2 |
| Trifolium monanthum ssp. parvum | Trifolium pusillum Greene | TRPU8 |
| Trifolium monanthum ssp. tenerum | Trifolium monanthum Gray var. eastwoodianum J.S. Martin | TRMOE |
| Trifolium monanthum ssp. tenerum | Trifolium monanthum Gray var. tenerum (Eastw.) Parish | TRMOT2 |
| Trifolium monanthum ssp. tenerum | Trifolium tenerum Eastw. | TRTE8 |
| Trifolium mucronatum ssp. lacerum | Trifolium arizonicum Greene | TRAR7 |
| Trifolium mucronatum ssp. lacerum | Trifolium involucratum Ortega var. arizonicum (Greene) McDermott | TRINA2 |
| Trifolium mucronatum ssp. lacerum | Trifolium lacerum Greene | TRLA20 |
| Trifolium mucronatum ssp. lacerum | Trifolium mucronatum Willd. ex Spreng. var. arizonicum (Greene) Isely | TRMUA |
| Trifolium mucronatum ssp. lacerum | Trifolium oxydon Greene ex Rydb. | TROX |
| Trifolium mucronatum ssp. lacerum | Trifolium wormskioldii Lehm. var. arizonicum (Greene) Barneby | TRWOA |
| Trifolium neurophyllum | Trifolium longipes Nutt. var. neurophyllum (Greene) J.S. Martin ex Isely | TRLON |
| Trifolium neurophyllum | Trifolium rusbyi Greene ssp. neurophyllum (Greene) Heller & Zoh. | TRRUN |
| Trifolium nigrescens ssp. petrisavii | Trifolium meneghinianum Clementi | TRME12 |
| Trifolium obscurum | Trifolium isodon Murb. | TRIS3 |
| Trifolium obscurum | Trifolium obscurum Savi ssp. aequidentatum (Perez Lara) C. Vicioso | TROBA |
| Trifolium obtusiflorum | Trifolium tridentatum Lindl. var. obtusiflorum (Hook. f.) S. Wats. | TRTRO |
| Trifolium oliganthum | Trifolium pauciflorum Nutt. | TRPA15 |
| Trifolium oliganthum | Trifolium variegatum Nutt. var. pauciflorum (Nutt.) McDermott | TRVAP |
| Trifolium olivaceum | Trifolium albopurpureum Torr. & Gray var. olivaceum (Greene) Isely | TRALO |
| Trifolium olivaceum | Trifolium columbianum Greene var. olivaceum (Greene) Jepson | TRCOO |
| Trifolium pannonicum ssp. elongatum | Trifolium armenium Willd. | TRAR12 |
| Trifolium parryi ssp. montanense | Trifolium inaequale Rydb. | TRIN9 |
| Trifolium parryi ssp. montanense | Trifolium montanense Rydb. | TRMO12 |
| Trifolium parryi ssp. montanense | Trifolium parryi Gray var. montanense (Rydb.) Isely | TRPAM2 |
| Trifolium parryi ssp. salictorum | Trifolium salictorum Greene ex Rydb. | TRSA6 |
| Trifolium pinetorum | Trifolium longicaule Woot. & Standl. | TRLO6 |
| Trifolium pinetorum | Trifolium willdenowii Spreng. var. longicaule (Woot. & Standl.) L. Benson | TRWIL |
| Trifolium pinetorum | Trifolium wormskioldii Lehm. var. longicaule (Woot. & Standl.) L. Benson | TRWOL |
| Trifolium plumosum ssp. amplifolium | Trifolium plumosum Dougl. ex Hook. var. amplifolium J.S. Martin | TRPLA2 |
| Trifolium polymorphum | Trifolium amphianthum Torr. & Gray | TRAM10 |
| Trifolium polymorphum | Trifolium megalanthum Steud. | TRME11 |
| Trifolium pratense | Trifolium pratense L. var. frigidum auct. non Gaudin [misapplied] | TRPRF |
| Trifolium pratense | Trifolium pratense L. var. sativum (P. Mill.) Schreb. | TRPRS |
| Trifolium productum | Trifolium kingii S. Wats. ssp. productum (Greene) D. Heller | TRKIP |
| Trifolium productum | Trifolium kingii S. Wats. var. productum (Greene) Jepson | TRKIP2 |
| Trifolium reflexum | Trifolium reflexum L. var. glabrum Loja. | TRREG |
| Trifolium repens | Trifolium repens L. var. atropurpureum hort. | TRREA |
| Trifolium repens var. biasolettii | Trifolium occidentale Coombe | TROC5 |
| Trifolium resupinatum var. majus | Trifolium resupinatum L. var. suaveolens (Willd.) Dinsm. | TRRES |
| Trifolium retusum | Trifolium parviflorum Ehrh. | TRPA23 |
| Trifolium rollinsii | Trifolium kingii S. Wats. ssp. rollinsii (J. Gillett) D. Heller | TRKIR |
| Trifolium rollinsii | Trifolium macilentum Greene var. rollinsii (J. Gillett) Barneby | TRMAR |
| Trifolium siskiyouense | Trifolium wormskioldii Lehm. var. siskiyouense (J. M. Gillett) Isely | TRWOS |
| Trifolium squamosum | Trifolium maritimum Huds. | TRMA15 |
| Trifolium squamosum | Trifolium maritinum Huds. [orthographic error] | TRMA14 |
| Trifolium subterraneum ssp. brachycalycinum | Trifolium brachycalycinum (Katzn. & Morley) Katzn. | TRBR16 |
| Trifolium sylvaticum | Trifolium lagopus Pourr. ex Willd. | TRLA27 |
| Trifolium sylvaticum | Trifolium smyrnaeum Boiss. | TRSM2 |
| Trifolium tomentosum | Trifolium tomentosum L. var. tomentosum L. [superfluous autonym] | TRTOT |
| Trifolium tomentosum var. curvisepalum | Trifolium curvisepalum Tackh. | TRCU5 |
| Trifolium variegatum | Trifolium appendiculatum Loja. | TRAP |
| Trifolium variegatum | Trifolium geminiflorum Greene | TRGE3 |
| Trifolium variegatum | Trifolium melananthum Hook. & Arn. | TRME6 |
| Trifolium variegatum | Trifolium polyodon Greene | TRPO3 |
| Trifolium variegatum | Trifolium trilobatum Jepson | TRTR14 |
| Trifolium variegatum | Trifolium variegatum Nutt. var. major Loja. | TRVAM |
| Trifolium variegatum | Trifolium variegatum Nutt. var. melananthum (Hook. & Arn.) Greene | TRVAM2 |
| Trifolium variegatum | Trifolium variegatum Nutt. var. rostratum (Greene) C.L. Hitchc. | TRVAR |
| Trifolium variegatum | Trifolium variegatum Nutt. var. trilobatum (Jepson) McDermott | TRVAT |
| Trifolium virginicum | Trifolium reflexum L. var. virginicum (Small ex Small & Vail) McDermott | TRREV |
| Trifolium willdenowii | Trifolium tridentatum Lindl. | TRTR2 |
| Trifolium willdenowii | Trifolium tridentatum Lindl. var. aciculare (Nutt.) McDermott | TRTRA |
| Trifolium willdenowii | Trifolium willdenovii Sprengel [orthographic variant] | TRWI3 |
| Trifolium wormskioldii | Lupinaster wormskioldii (Lehm.) K. Presl | LUWO2 |
| Trifolium wormskioldii | Trifolium fendleri Greene | TRFE2 |
| Trifolium wormskioldii | Trifolium fimbriatum Lindl. | TRFI2 |
| Trifolium wormskioldii | Trifolium heterodon Torr. & Gray | TRHE3 |
| Trifolium wormskioldii | Trifolium involucratum Ortega var. fendleri (Greene) McDermott | TRINF |
| Trifolium wormskioldii | Trifolium involucratum Ortega var. fimbriatum (Lindl.) McDermott | TRINF2 |
| Trifolium wormskioldii | Trifolium involucratum Ortega var. heterodon (Torr. & Gray) S. Wats. | TRINH |
| Trifolium wormskioldii | Trifolium involucratum Ortega var. kennedianum McDermott | TRINK |
| Trifolium wormskioldii | Trifolium kennedianum (McDermott) A. Nels. & J.F. Macbr. | TRKE |
| Trifolium wormskioldii | Trifolium spinulosum Dougl. ex Hook. | TRSP6 |
| Trifolium wormskioldii | Trifolium willdenowii Spreng. var. fimbriatum (Lindl.) Ewan | TRWIF |
| Trifolium wormskioldii | Trifolium willdenowii Spreng. var. kennedianum (McDermott) Ewan | TRWIK |
| Trifolium wormskioldii | Trifolium wormskioldii Lehm. var. fimbriatum (Lindl.) Jepson | TRWOF |
| Trifolium wormskioldii | Trifolium wormskioldii Lehm. var. kennedianum (McDermott) Jepson | TRWOK |
| Trinidad milkvetch | Astragalus puniceus Osterhout | ASPU8 |
| Trinidad milkvetch | Astragalus puniceus Osterhout var. gertrudis (Greene) Barneby | ASPUG |
| Trinidad milkvetch | Astragalus puniceus Osterhout var. puniceus | ASPUP6 |
| triplerib milkvetch | Astragalus tricarinatus Gray | ASTR5 |
| Tripodion tetraphyllum | Anthyllis tetraphylla L. | ANTE11 |
| tropical cowpea | Vigna juruana (Harms) Verdc. | VIJU |
| tropical kudzu | Pueraria phaseoloides (Roxb.) Benth. | PUPH2 |
| tropical puff | Neptunia pubescens Benth. | NEPU3 |
| tropical puff | Neptunia pubescens Benth. var. microcarpa (Rose) Windler | NEPUM |
| tropical puff | Neptunia pubescens Benth. var. pubescens | NEPUP |
| tropical sensitive pea | Chamaecrista absus (L.) Irwin & Barneby | CHAB3 |
| tropical sensitive pea | Chamaecrista absus (L.) Irwin & Barneby var. absus (L.) Irwin & Barneby [excluded] | CHABA2 |
| tropical sensitive pea | Chamaecrista absus (L.) Irwin & Barneby var. meonandra (Irwin & Barneby) Irwin & Barneby | CHABM |
| tropical ticktrefoil | Desmodium cajanifolium (Kunth) DC. | DECA15 |
| troubled milkvetch | Astragalus anxius R.J. Meinke & Kaye | ASAN18 |
| Trout Creek milkvetch | Astragalus salmonis M.E. Jones | ASSA4 |
| true indigo | Indigofera tinctoria L. | INTI |
| tuberous sweetpea | Lathyrus tuberosus L. | LATU |
| tufted milkvetch | Astragalus spatulatus Sheldon | ASSP6 |
| tundra milkvetch | Astragalus umbellatus Bunge | ASUM2 |
| turkeypeas | Astragalus nuttallianus DC. var. cedrosensis M.E. Jones | ASNUC |
| turkeypeas | Astragalus nuttallianus DC. var. imperfectus (Rydb.) Barneby | ASNUI |
| turkeypeas | Astragalus nuttallianus DC. var. macilentus (Small) Barneby | ASNUM |
| turkeypeas | Astragalus nuttallianus DC. var. micranthiformis Barneby | ASNUM2 |
| turkeypeas | Astragalus nuttallianus DC. var. trichocarpus Torr. & Gray | ASNUT |
| turkeypeas | Astragalus nuttallianus DC. var. zapatanus Barneby | ASNUZ |
| turniproot | Pediomelum cyphocalyx (Gray) Rydb. | PECY7 |
| turpentine mulga | Acacia cibaria F. Muell. | ACCI6 |
| Tweedy's milkvetch | Astragalus tweedyi Canby | ASTW |
| Tweedy's ticktrefoil | Desmodium tweedyi Britt. | DETW |
| twin clover | Trifolium latifolium (Hook.) Greene | TRLA8 |
| twining bluehood | Oxyrhynchus volubilis Brandeg. | OXVO |
| twining snoutbean | Rhynchosia tomentosa (L.) Hook. & Arn. | RHTO3 |
| twining snoutbean | Rhynchosia tomentosa (L.) Hook. & Arn. var. mollissima (Ell.) Torr. & Gray | RHTOM |
| twining snoutbean | Rhynchosia tomentosa (L.) Hook. & Arn. var. tomentosa | RHTOT |
| twinleaf senna | Senna bauhinioides (Gray) Irwin & Barneby | SEBA3 |
| two-horn bundleflower | Desmanthus bicornutus S. Wats. | DEBI8 |
| two-leaf vetch | Vicia unijuga A. Braun | VIUN2 |
| two-vein-hickory | Acacia binervata DC. | ACBI5 |
| twocrested milkvetch | Astragalus bicristatus Gray | ASBI |
| twoflower pea | Lathyrus biflorus T.W. & J.P. Nelson | LABI3 |
| twoflower rattlebox | Crotalaria biflora L. | CRBI8 |
| twoflower stickpea | Calliandra biflora Tharp | CABI |
| twogrooved milkvetch | Astragalus bisulcatus (Hook.) Gray | ASBI2 |
| twogrooved milkvetch | Astragalus bisulcatus (Hook.) Gray var. bisulcatus | ASBIB |
| twogrooved milkvetch | Astragalus bisulcatus (Hook.) Gray var. major (M.E. Jones) Welsh | ASBIM |
| twoleaf senna | Senna roemeriana (Scheele) Irwin & Barneby | SERO8 |
| twoleaf sensitive pea | Chamaecrista diphylla (L.) Greene | CHDI6 |
| Tygh Valley milkvetch | Astragalus tyghensis M.E. Peck | ASTY |
| uhiuhi | Caesalpinia kavaiensis Mann | CAKA5 |
| Uinta clover | Trifolium dasyphyllum Torr. & Gray ssp. uintense (Rydb.) J. Gillett | TRDAU |
| Ulex minor | Ulex nanus T.F. Forst. ex Symons [excluded] | ULNA2 |
| umbrella acacia | Acacia oswaldii F. Muell. | ACOS2 |
| umbrella thorn | Acacia tortilis (Forsskal) Hayne | ACTO6 |
| Urban's mimosa | Mimosa quadrivalvis L. var. urbaniana Barneby | MIQUU |
| Utah bird's-foot trefoil | Lotus utahensis Ottley | LOUT3 |
| Utah lupine | Lupinus caespitosus Nutt. var. utahensis (S. Wats.) Cox | LUCAU |
| Utah milkvetch | Astragalus utahensis (Torr.) Torr. & Gray | ASUT |
| Utah pea | Lathyrus pauciflorus Fern. var. utahensis (M.E. Jones) Piper ex M.E. Peck | LAPAU |
| Utah sweetvetch | Hedysarum boreale Nutt. | HEBO |
| Utah sweetvetch | Hedysarum boreale Nutt. ssp. boreale | HEBOB |
| Utah sweetvetch | Hedysarum boreale Nutt. ssp. boreale var. boreale | HEBOB2 |
| Utah sweetvetch | Hedysarum boreale Nutt. ssp. boreale var. gremiale (Rollins) Northstrom & Welsh | HEBOG2 |
| Utah sweetvetch | Hedysarum boreale Nutt. var. gremiale (Rollins) Northstrom & S. L. Welsh | HEBOG3 |
| valamuerto | Senna pendula (Humb. & Bonpl. ex Willd.) Irwin & Barneby | SEPE4 |
| valamuerto | Senna pendula (Humb. & Bonpl. ex Willd.) Irwin & Barneby var. advena (Vogel) Irwin & Barneby | SEPEA |
| valamuerto | Senna pendula (Humb. & Bonpl. ex Willd.) Irwin & Barneby var. glabrata (Vogel) Irwin & Barneby | SEPEG |
| valamuerto | Senna pendula (Humb. & Bonpl. ex Willd.) Irwin & Barneby var. pendula (Humb. & Bonpl. ex Willd.) Irwin & Barneby [excluded] | SEPEP4 |
| valley lupine | Lupinus subvexus C.P. Sm. | LUSU10 |
| valley lupine | Lupinus subvexus C.P. Sm. var. albilanatus C.P. Sm. | LUSUA |
| valley lupine | Lupinus subvexus C.P. Sm. var. phoeniceus C.P. Sm. | LUSUP |
| valley lupine | Lupinus subvexus C.P. Sm. var. subvexus | LUSUS |
| valley lupine | Lupinus subvexus C.P. Sm. var. transmontanus C.P. Sm. | LUSUT |
| variable bean | Phaseolus polymorphus S. Wats. | PHPO4 |
| variable-leaf ticktrefoil | Desmodium heterophyllum (Willd.) DC. | DEHE9 |
| variableleaf bushbean | Macroptilium gibbosifolium (Ortega) A. Delgado | MAGI2 |
| Vavilov's clover | Trifolium vavilovii Eig | TRVA7 |
| Veatch's island broom | Lotus dendroideus (Greene) Greene var. veatchii (Greene) Isely | LODEV |
| vegetable hummingbird | Sesbania grandiflora (L.) Poir. | SEGR5 |
| veiny pea | Lathyrus venosus Muhl. ex Willd. | LAVE |
| velvet bundleflower | Desmanthus velutinus Scheele | DEVE2 |
| velvet leaf senna | Senna lindheimeriana (Scheele) Irwin & Barneby | SELI4 |
| velvet lupine | Lupinus leucophyllus Dougl. ex Lindl. | LULE3 |
| velvet lupine | Lupinus leucophyllus Dougl. ex Lindl. ssp. erectus (Henderson) Harmon | LULEE |
| velvet lupine | Lupinus leucophyllus Dougl. ex Lindl. ssp. leucophyllus | LULEL4 |
| velvet lupine | Lupinus leucophyllus Dougl. ex Lindl. ssp. leucophyllus var. belliae C.P. Sm. | LULEB2 |
| velvet lupine | Lupinus leucophyllus Dougl. ex Lindl. ssp. leucophyllus var. canescens (T.J. Howell) C.P. Sm. | LULEC9 |
| velvet lupine | Lupinus leucophyllus Dougl. ex Lindl. ssp. leucophyllus var. leucophyllus | LULEL2 |
| velvet mesquite | Prosopis velutina Woot. | PRVE |
| velvet tamarind | Dialium guineense Willd. | DIGU2 |
| velvetleaf ticktrefoil | Desmodium viridiflorum (L.) DC. | DEVI4 |
| velvetpod mimosa | Mimosa dysocarpa Benth. | MIDY |
| vetch | Vicia fulgens Battand. | VIFU |
| vetch | Vicia hyrcanica Fisch. & Mey. | VIHY2 |
| vetch | Vicia L. | VICIA |
| vetch | Vicia montbretii Fisch. & C. A. Mey. | VIMO7 |
| vetch | Vicia palaestina Boiss. | VIPA13 |
| Vicia americana | Vicia americana Willd. var. americana Willd. [superfluous autonym] | VIAMA6 |
| Vicia americana ssp. americana | Vicia americana Muhl. ex Willd. ssp. oregana (Nutt.) Abrams | VIAMO |
| Vicia americana ssp. americana | Vicia americana Muhl. ex Willd. var. oregana (Nutt.) A. Nels. | VIAMO2 |
| Vicia americana ssp. americana | Vicia americana Muhl. ex Willd. var. truncata (Nutt.) Brewer | VIAMT2 |
| Vicia americana ssp. americana | Vicia americana Muhl. ex Willd. var. villosa (Kellogg) F.J. Herm. | VIAMV2 |
| Vicia americana ssp. americana | Vicia californica Greene | VICA13 |
| Vicia americana ssp. americana | Vicia californica Greene var. madrensis Jepson | VICAM2 |
| Vicia americana ssp. americana | Vicia oregana Nutt. | VIOR2 |
| Vicia americana ssp. americana | Vicia sparsifolia Nutt. ex Torr. & Gray var. truncata (Nutt.) S. Wats. | VISPT |
| Vicia americana ssp. minor | Lathyrus linearis Nutt. | LALI4 |
| Vicia americana ssp. minor | Vicia americana Muhl. ex Willd. var. angustifolia Nees | VIAMA2 |
| Vicia americana ssp. minor | Vicia americana Muhl. ex Willd. var. linearis (Nutt.) S. Wats. | VIAML8 |
| Vicia americana ssp. minor | Vicia americana Muhl. ex Willd. var. minor Hook. | VIAMM |
| Vicia americana ssp. minor | Vicia linearis (Nutt.) Greene | VILI3 |
| Vicia americana ssp. minor | Vicia sparsifolia Nutt. ex Torr. & Gray | VISP2 |
| Vicia americana ssp. minor | Vicia trifida F.G. Dietr. | VITR10 |
| Vicia anatolica | Vicia hajastana Grossh. | VIHA4 |
| Vicia benghalensis | Vicia atropurpurea Desf. | VIAT2 |
| Vicia biennis | Vicia picta Fisch. & C. A. Mey. | VIPI3 |
| Vicia canescens ssp. gregaria | Vicia gregaria Boiss. & Heldr. | VIGR7 |
| Vicia canescens ssp. variegata | Vicia variegata Willd. | VIVA4 |
| Vicia caroliniana | Vicia hugeri Small | VIHU |
| Vicia cracca ssp. cracca | Vicia cracca L. ssp. grossheimii (Ekutim.) Hashimov, nom. inval. [anomalous] | VICRG |
| Vicia cracca ssp. cracca | Vicia semicincta Greene | VISE6 |
| Vicia cracca ssp. incana | Vicia incana Gouan | VIIN4 |
| Vicia cracca ssp. stenophylla | Vicia dalmatica A. Kern. | VIDA3 |
| Vicia cracca ssp. stenophylla | Vicia elegans Guss. | VIEL2 |
| Vicia cracca ssp. tenuifolia | Vicia cracca L. var. angustissima Neilr. | VICRA |
| Vicia cracca ssp. tenuifolia | Vicia cracca L. var. tenuifolia (Roth) G. Beck | VICRT2 |
| Vicia cracca ssp. tenuifolia | Vicia tenuifolia Roth | VITE2 |
| Vicia ervilia | Ervum ervilia L. | ERER12 |
| Vicia faba | Faba vulgaris Moench | FAVU3 |
| Vicia grandiflora | Vicia grandiflora Scop. var. kitaibeliana W.D.J. Koch | VIGRK |
| Vicia hassei | Vicia exigua Nutt. var. californica Torr. | VIEXC |
| Vicia hassei | Vicia exigua Nutt. var. hassei (S. Wats.) Jepson | VIEXH |
| Vicia incisa | Vicia incisiformis Stef., nom. inval. [anomalous] | VIIN5 |
| Vicia laxiflora | Vicia tenuissima Schinz & Thellung, non Ervum tenuissimum Bieb. | VITE4 |
| Vicia laxiflora | Vicia tetrasperma (L.) Schreb. var. gracilis (Hook.) Aschers. & Graebn. | VITEG |
| Vicia lilacina | Vicia neglecta Hanelt & Mett. | VINE3 |
| Vicia loiseleurii | Vicia litvinovii Boriss., nom. illeg. [anomalous] | VILI6 |
| Vicia loiseleurii | Vicia meyeri Boiss. | VIME5 |
| Vicia ludoviciana | Vicia ludoviciana Nutt. var. ludoviciana Nutt. [superfluous autonym] | VILUL8 |
| Vicia ludoviciana ssp. leavenworthii | Vicia leavenworthii Torr. & Gray | VILE2 |
| Vicia ludoviciana ssp. ludoviciana | Vicia exigua Nutt. | VIEX |
| Vicia ludoviciana ssp. ludoviciana | Vicia leavenworthii Torr. & Gray var. occidentalis Shinners | VILEO2 |
| Vicia ludoviciana ssp. ludoviciana | Vicia ludoviciana Nutt. var. laxiflora Shinners | VILUL3 |
| Vicia ludoviciana ssp. ludoviciana | Vicia ludoviciana Nutt. var. texana (Torr. & Gray) Shinners | VILUT |
| Vicia ludoviciana ssp. ludoviciana | Vicia producta Rydb. | VIPR6 |
| Vicia ludoviciana ssp. ludoviciana | Vicia texana (Torr. & Gray) Small | VITE6 |
| Vicia lutea | Vicia lutea L. var. laevigata (Sm.) Boiss. | VILUL5 |
| Vicia lutea ssp. vestita | Vicia lutea L. var. hirta (Balb. ex DC.) Loisel. | VILUH |
| Vicia lutea ssp. vestita | Vicia lutea L. var. violascens Rouy | VILUV |
| Vicia magellanica | Vicia kingii Hook. f. | VIKI2 |
| Vicia minutiflora | Vicia micrantha Nutt. ex Torr. & Gray | VIMI7 |
| Vicia minutiflora | Vicia reverchonii S. Wats. | VIRE5 |
| Vicia monantha | Vicia calcarata Desf. | VICA18 |
| Vicia montbretii | Vicia montbreti Fisch. & Mey. [orthographic variant] | VIMO6 |
| Vicia montevidensis | Vicia obscura Vogel | VIOB6 |
| Vicia nigricans ssp. gigantea | Vicia gigantea Hook. | VIGI |
| Vicia sativa | Vicia globosa Retz. | VIGL4 |
| Vicia sativa ssp. amphicarpa | Vicia amphicarpa L. | VIAM6 |
| Vicia sativa ssp. cordata | Vicia cordata Wulfen ex Hoppe | VICO12 |
| Vicia sativa ssp. macrocarpa | Vicia macrocarpa (Moris) Bertol. | VIMA8 |
| Vicia sativa ssp. nigra | Vicia angustifolia L. | VIAN |
| Vicia sativa ssp. nigra | Vicia angustifolia L. var. segetalis (Thuill.) W.D.J. Koch | VIANS |
| Vicia sativa ssp. nigra | Vicia angustifolia L. var. uncinata (Desv.) Rouy | VIANU |
| Vicia sativa ssp. nigra | Vicia pilosa M. Bieb. | VIPI4 |
| Vicia sativa ssp. nigra | Vicia sativa L. ssp. segetalis (Thuill.) Celak. | VISAS4 |
| Vicia sativa ssp. nigra | Vicia sativa L. var. angustifolia (L.) Ser. | VISAA2 |
| Vicia sativa ssp. nigra | Vicia sativa L. var. nigra L. | VISAN |
| Vicia sativa ssp. nigra | Vicia sativa L. var. segetalis (Thuill.) Ser. | VISAS3 |
| Vicia sativa ssp. sativa | Vicia sativa L. var. leucosperma (Moench) Ser. | VISAL2 |
| Vicia sativa ssp. sativa | Vicia sativa L. var. linearis Lange | VISAL |
| Vicia serratifolia | Vicia narbonensis L. var. serratifolia (Jacq.) Ser. | VINAS |
| Vicia tetrasperma | Vicia tetrasperma (L.) Schreb. var. tenuissima Druce | VITET |
| Vicia venosa var. cuspidata | Vicia sexajuga Nakai | VISE12 |
| Vicia villosa ssp. eriocarpa | Vicia eriocarpa (Hausskn.) Hal. | VIER5 |
| Vicia villosa ssp. pseudocracca | Vicia pseudocracca Bertol. | VIPS2 |
| Vicia villosa ssp. varia | Vicia dasycarpa Ten. | VIDA |
| Vicia villosa ssp. varia | Vicia villosa Roth var. glabrescens W.D.J. Koch | VIVIG |
| Vigna aconitifolia | Phaseolus aconitifolius Jacq. | PHAC8 |
| Vigna adenantha | Phaseolus adenanthus G.F.W. Mey. | PHAD3 |
| Vigna ambacensis | Vigna stuhlmannii Harms | VIST5 |
| Vigna angularis | Dolichos angularis Willd. | DOAN |
| Vigna angularis | Phaseolus angularis (Willd.) W. Wight | PHAN7 |
| Vigna antillana | Phaseolus antillanus Urban | PHAN11 |
| Vigna caracalla | Phaseolus caracalla L. | PHCA32 |
| Vigna hosei | Dolichos hosei Craib | DOHO |
| Vigna lasiocarpa | Dolichos jacquinii DC. | DOJA2 |
| Vigna longifolia | Phaseolus schottii Benth. | PHSC4 |
| Vigna longifolia | Phaseolus trichocarpus C. Wright | PHTR4 |
| Vigna luteola | Vigna nilotica (Delile) Hook. f. | VINI4 |
| Vigna luteola | Vigna repens (L.) Kuntze, non Baker | VIRE80 |
| Vigna marina | Vigna retusa (E. Mey.) Walp. | VIRE12 |
| Vigna mungo | Phaseolus mungo L. | PHMU8 |
| Vigna oblongifolia var. oblongifolia | Vigna wilmsii Burtt Davy | VIWI2 |
| Vigna owahuensis | Vigna sandwicensis Gray | VISA3 |
| Vigna owahuensis | Vigna sandwicensis Gray var. heterophylla Rock | VISAH |
| Vigna peduncularis | Phaseolus peduncularis Kunth | PHPE6 |
| Vigna radiata var. radiata | Phaseolus aureus Roxb. | PHAU9 |
| Vigna radiata var. radiata | Phaseolus radiatus L. | PHRA10 |
| Vigna radiata var. sublobata | Phaseolus sublobatus Roxb. | PHSU17 |
| Vigna radiata var. sublobata | Phaseolus trinervius Wight & Arnott | PHTR8 |
| Vigna speciosa | Phaseolus speciosus Kunth | PHSP80 |
| Vigna subterranea | Glycine subterranea L. | GLSU3 |
| Vigna subterranea | Voandzeia subterranea (L.) DC. | VOSU2 |
| Vigna umbellata | Phaseolus calcaratus Roxb. | PHCA31 |
| Vigna unguiculata | Vigna sinensis (L.) Savi | VISI5 |
| Vigna unguiculata ssp. cylindrica | Dolichos biflorus L. | DOBI3 |
| Vigna unguiculata ssp. cylindrica | Phaseolus cylindricus L. | PHCY2 |
| Vigna unguiculata ssp. cylindrica | Vigna catjang (Burman f.) Walp. | VICA17 |
| Vigna unguiculata ssp. cylindrica | Vigna cylindrica (L.) Skeels | VICY |
| Vigna unguiculata ssp. dekindtiana | Vigna baoulensis A. Chev. | VIBA5 |
| Vigna unguiculata ssp. sesquipedalis | Dolichos sesquipedalis L. | DOSE2 |
| Vigna unguiculata ssp. sesquipedalis | Vigna sesquipedalis (L.) Fruw. | VISE10 |
| Vigna unguiculata ssp. sesquipedalis | Vigna sinensis (L.) Savi ex Hassk. ssp. sesquipedalis (L.) Eselt. | VISIS2 |
| Vigna unguiculata ssp. stenophylla | Vigna triloba Walp., nom. illeg. [anomalous] | VITR13 |
| violet lespedeza | Lespedeza violacea (L.) Pers. | LEVI6 |
| violet milkvetch | Astragalus iodopetalus (Rydb.) Barneby | ASIO2 |
| viperina | Zornia bracteata Walt. ex J.F. Gmel. | ZOBR |
| virgilia | Virgilia Poir., nom. cons. | VIRGI |
| Virgilia oroboides | Virgilia divaricata Adamson | VIDI9 |
| Virginia jointvetch | Aeschynomene virginica (L.) B.S.P. | AEVI3 |
| Virginia tephrosia | Tephrosia virginiana (L.) Pers. | TEVI |
| viscid acacia | Acacia neovernicosa Isely | ACNE4 |
| viscid locoweed | Oxytropis borealis DC. var. viscida (Nutt.) Welsh | OXBOV |
| Vogel's tephrosia | Tephrosia vogelii Hook. f. | TEVO2 |
| waha milkvetch | Astragalus arthurii M.E. Jones | ASAR8 |
| wait-a-bit vine | Caesalpinia phyllanthoides Standl. | CAPH |
| Walker Pass milkvetch | Astragalus ertterae Barneby & Shevock | ASER6 |
| Walker prairie clover | Dalea pogonathera Gray var. walkerae (Tharp & Barkl.) B.L. Turner | DAPOW |
| Wallangarra wattle | Acacia adunca A. Cunn. ex G. Don | ACAD |
| wand holdback | Hoffmannseggia microphylla Torr. | HOMI5 |
| wand lespedeza | Lespedeza virgata (Thunb.) DC. | LEVI80 |
| wand riverhemp | Sesbania virgata (Cav.) Poir. | SEVI7 |
| wandering vetch | Vicia peregrina L. | VIPE80 |
| Ward's milkvetch | Astragalus wardii Gray | ASWA2 |
| Warminster broom | Cytisus ?praecox Wheeler ex Bean. [multiflorus ? purgans] | CYPR15 |
| Warnock's prairie clover | Dalea bartonii Barneby | DABA2 |
| Washoe lupine | Lupinus lyallii Gray ssp. washoensis (Heller) Cox | LULYW |
| water dead and awake | Neptunia plena (L.) Benth. | NEPL |
| water locust | Gleditsia aquatica Marsh. | GLAQ |
| water medick | Medicago littoralis Rhode ex Loisel. | MELI5 |
| water wattle | Acacia retinodes Schlecht. | ACRE2 |
| Waterfall's milkvetch | Astragalus waterfallii Barneby | ASWA3 |
| wattapama | Poitea florida (Vahl) Lavin | POFL20 |
| wattapama | Poitea Vent. | POITE |
| Webber's milkvetch | Astragalus webberi Gray ex Brewer & S. Wats. | ASWE |
| wedge-leaf wattle | Acacia pravissima F. Muell. | ACPR6 |
| wedgeleaf prairie clover | Dalea emarginata (Torr. & Gray) Shinners | DAEM2 |
| Weiser's milkvetch | Astragalus beckwithii Torr. & Gray var. weiserensis M.E. Jones | ASBEW |
| West African albizzia | Albizia adianthifolia (Schumach.) W. Wight | ALAD2 |
| West Indian milkpea | Galactia dubia DC. | GADU2 |
| West Indian rattlebox | Crotalaria trichotoma Bojer | CRTR12 |
| western bird's-foot trefoil | Lotus scoparius (Nutt.) Ottley var. brevialatus Ottley | LOSCB |
| western honey mesquite | Prosopis glandulosa Torr. var. torreyana (L. Benson) M.C. Johnston | PRGLT |
| western milkvetch | Astragalus robbinsii (Oakes) Gray var. occidentalis S. Wats. | ASROO |
| western necklacepod | Sophora leachiana M.E. Peck | SOLE3 |
| western sweetvetch | Hedysarum occidentale Greene | HEOC |
| western sweetvetch | Hedysarum occidentale Greene var. canone Welsh | HEOCC |
| western sweetvetch | Hedysarum occidentale Greene var. occidentale | HEOCO2 |
| western trailing ticktrefoil | Desmodium procumbens (P. Mill.) A.S. Hitchc. | DEPR2 |
| western trailing ticktrefoil | Desmodium procumbens (P. Mill.) A.S. Hitchc. var. exiguum (Gray) Schub. | DEPRE |
| western trailing ticktrefoil | Desmodium procumbens (P. Mill.) A.S. Hitchc. var. procumbens | DEPRP |
| Wetherill's milkvetch | Astragalus wetherillii M.E. Jones | ASWE2 |
| White Clouds milkvetch | Astragalus vexilliflexus Sheldon var. nubilus Barneby | ASVEN |
| white clover | Trifolium repens L. | TRRE3 |
| white crownvetch | Securigera globosa (Lam.) Lassen | SEGL12 |
| white hoarypea | Tephrosia candida DC. | TECA5 |
| white leadtree | Leucaena leucocephala (Lam.) de Wit | LELE10 |
| white leadtree | Leucaena leucocephala (Lam.) de Wit ssp. leucocephala | LELEL2 |
| white locoweed | Oxytropis sericea Nutt. | OXSE |
| white locoweed | Oxytropis sericea Nutt. var. sericea | OXSES |
| white locoweed | Oxytropis sericea Nutt. var. speciosa (Torr. & Gray) Welsh | OXSES2 |
| white lupine | Lupinus albus L. | LUAL22 |
| white moneywort | Alysicarpus vaginalis (L.) DC. | ALVA2 |
| White Mountain clover | Trifolium neurophyllum Greene | TRNE3 |
| White Mountain lupine | Lupinus sierrae-blancae Woot. & Standl. | LUSI2 |
| White Mountain lupine | Lupinus sierrae-blancae Woot. & Standl. ssp. aquilinus (Woot. & Standl.) Fleak & D. Dunn | LUSIA |
| White Mountain lupine | Lupinus sierrae-blancae Woot. & Standl. ssp. sierrae-blancae | LUSIS |
| white pea | Lathyrus sativus L. | LASA2 |
| white prairie clover | Dalea candida Michx. ex Willd. | DACA7 |
| white prairie clover | Dalea candida Michx. ex Willd. var. candida | DACAC |
| white prairie clover | Dalea candida Michx. ex Willd. var. oligophylla (Torr.) Shinners | DACAO |
| white spanishbroom | Cytisus multiflorus (L'H?r.) Sweet | CYMU3 |
| white stickpea | Zapoteca H. Hern?ndez | ZAPOT |
| white stickpea | Zapoteca portoricensis (Jacq.) H. Hern?ndez | ZAPO2 |
| white sweetvetch | Hedysarum sulphurescens Rydb. | HESU |
| white wild indigo | Baptisia alba (L.) Vent. | BAAL |
| white wild indigo | Baptisia alba (L.) Vent. var. alba | BAALA |
| whitebark senna | Senna bacillaris (L. f.) Irwin & Barneby | SEBA2 |
| Whited's milkvetch | Astragalus sinuatus Piper | ASSI5 |
| whiteflower albizia | Albizia saponaria (Lour.) Blume ex Miq. | ALSA10 |
| whiteflower prairie clover | Dalea albiflora Gray | DAAL |
| whiterim scurfpea | Pediomelum subacaule (Torr. & Gray) Rydb. | PESU5 |
| whitetassels | Dalea carnea (Michx.) Poir. | DACA8 |
| whitetassels | Dalea carnea (Michx.) Poir. var. albida (Torr. & Gray) Barneby | DACAA2 |
| whitetassels | Dalea carnea (Michx.) Poir. var. carnea | DACAC2 |
| whitetassels | Dalea carnea (Michx.) Poir. var. gracilis (Nutt.) Barneby | DACAG |
| whitethorn acacia | Acacia constricta Benth. | ACCO2 |
| whitethorn acacia | Acacia constricta Benth. var. constricta | ACCOC |
| whitethorn acacia | Acacia constricta Benth. var. paucispina Woot. & Standl. | ACCOP9 |
| whitetip clover | Trifolium variegatum Nutt. | TRVA |
| whitewhorl lupine | Lupinus densiflorus Benth. | LUDE2 |
| whitewhorl lupine | Lupinus densiflorus Benth. var. aureus (Kellogg) Munz | LUDEA |
| whitewhorl lupine | Lupinus densiflorus Benth. var. austrocollium C.P. Sm. | LUDEA2 |
| whitewhorl lupine | Lupinus densiflorus Benth. var. densiflorus | LUDED |
| whitewhorl lupine | Lupinus densiflorus Benth. var. glareosus (Elmer) C.P. Sm. | LUDEG |
| whitewhorl lupine | Lupinus densiflorus Benth. var. lacteus (Kellogg) C.P. Sm. | LUDEL |
| whitewhorl lupine | Lupinus densiflorus Benth. var. palustris (Kellogg) C.P. Sm. | LUDEP |
| Whiting's dalea | Psorothamnus thompsoniae (Vail) Welsh & Atwood var. whitingii (Kearney & Peebles) Barneby | PSTHW |
| widow's milkvetch | Astragalus layneae Greene | ASLA8 |
| Wight's neonotonia | Neonotonia wightii (Wight & Arn.) Lackey var. longicauda (Schweinf.) Lackey | NEWIL |
| Wight's neonotonia | Neonotonia wightii (Wight & Arn.) Lackey var. wightii | NEWIW |
| wild bushbean | Macroptilium lathyroides (L.) Urban | MALA9 |
| wild bushbean | Macroptilium lathyroides (L.) Urban var. lathyroides | MALAL2 |
| wild bushbean | Macroptilium lathyroides (L.) Urban var. semierectum (L.) Urban | MALAS |
| wild cassia | Senna singueana (Delile) Lock | SESI5 |
| wild coffee-bean | Bauhinia petersiana Bolle ssp. macrantha (Oliv.) Brummitt & J. H. Ross | BAPEM2 |
| wild indigo | Baptisia Vent. | BAPTI |
| wild pea | Pisum elatius Steven ex M. Bieb. | PIEL5 |
| wild pea | Vigna adenantha (G.F.W. Mey.) Marechal, Mascherpa & Stanier | VIAD2 |
| wild tamarind | Cojoba arborea (L.) Britt. & Rose | COAR9 |
| wild tantan | Desmanthus acuminatus Benth. | DEAC3 |
| wild tantan | Desmanthus virgatus (L.) Willd. | DEVI3 |
| wildhops | Flemingia strobilifera (L.) Ait. f. | FLST |
| wili wili | Erythrina sandwicensis O. Deg. | ERSA11 |
| Williams's milkvetch | Astragalus williamsii Rydb. | ASWI |
| Wilson's clusterpea | Dioclea wilsonii Standl. | DIWI4 |
| Wilson's milkvetch | Astragalus lentiginosus Dougl. ex Hook. var. wilsonii (Greene) Barneby | ASLEW |
| winged bean | Psophocarpus tetragonolobus (L.) DC. | PSTE10 |
| winged milkvetch | Astragalus pterocarpus S. Wats. | ASPT2 |
| winged pea | Tetragonolobus purpureus Moench | TEPU6 |
| winged wattle | Acacia alata R. Br. | ACAL16 |
| winter vetch | Vicia villosa Roth | VIVI |
| winter vetch | Vicia villosa Roth ssp. pseudocracca (Bertol.) Ball | VIVIP |
| winter vetch | Vicia villosa Roth ssp. varia (Host) Corb. | VIVIV8 |
| winter vetch | Vicia villosa Roth ssp. villosa | VIVIV |
| wire bird's-foot trefoil | Lotus nuttallianus Greene | LONU4 |
| Wislizenus's senna | Senna wislizeni (Gray) Irwin & Barneby | SEWI3 |
| wisteria | Wisteria Nutt. | WISTE |
| Wisteria floribunda | Kraunhia floribunda (Willd.) Taubert | KRFL |
| Wisteria floribunda | Rehsonia floribunda (Willd.) Stritch | REFL2 |
| Wisteria frutescens | Kraunhia frutescens (L.) Greene | KRFR |
| Wisteria frutescens | Kraunhia macrostachya (Torr. & Gray) Small | KRMA |
| Wisteria frutescens | Wisteria frutescens (L.) Poir. var. macrostachya Torr. & Gray | WIFRM |
| Wisteria frutescens | Wisteria macrostachya (Torr. & Gray) Nutt. ex B.L. Robins. & Fern. | WIMA |
| Wisteria sinensis | Rehsonia sinensis (Sims) Stritch | RESI |
| Wittmann's milkvetch | Astragalus wittmannii Barneby | ASWI3 |
| woman's tongue | Albizia lebbeck (L.) Benth. | ALLE |
| wonderbean | Canavalia ensiformis (L.) DC. | CAEN4 |
| wondering cowpea | Vigna speciosa (Kunth) Verdc. | VISP |
| wood vetch | Vicia sylvatica L. | VISY2 |
| woodland sensitive pea | Chamaecrista calycioides (DC. ex Colladon) Greene | CHCA26 |
| Woodruff's milkvetch | Astragalus woodruffii M.E. Jones | ASWO |
| woods clover | Trifolium pinetorum Greene | TRPI3 |
| woody milkvetch | Astragalus miser Dougl. var. hylophilus (Rydb.) Barneby | ASMIH |
| woodypod milkvetch | Astragalus sclerocarpus Gray | ASSC6 |
| woodyroot milkvetch | Astragalus riparius Barneby | ASRI |
| woolly bird's-foot trefoil | Lotus incanus (Torr.) Greene | LOIN6 |
| woolly clover | Trifolium tomentosum L. | TRTO4 |
| woolly locoweed | Astragalus mollissimus Torr. | ASMO7 |
| woolly locoweed | Astragalus mollissimus Torr. var. bigelovii (Gray) Barneby | ASMOB |
| woolly locoweed | Astragalus mollissimus Torr. var. coryi Tidestrom | ASMOC |
| woolly locoweed | Astragalus mollissimus Torr. var. earlei (Greene ex Rydb.) Tidestrom | ASMOE |
| woolly locoweed | Astragalus mollissimus Torr. var. marcidus (Greene ex Rydb.) Barneby | ASMOM |
| woolly locoweed | Astragalus mollissimus Torr. var. matthewsii (S. Wats.) Barneby | ASMOM2 |
| woolly locoweed | Astragalus mollissimus Torr. var. mogollonicus (Greene) Barneby | ASMOM3 |
| woolly locoweed | Astragalus mollissimus Torr. var. mollissimus | ASMOM5 |
| woolly locoweed | Astragalus mollissimus Torr. var. thompsoniae (S. Wats.) Barneby | ASMOT |
| woolly prairie clover | Dalea lanata Spreng. | DALA3 |
| woolly prairie clover | Dalea lanata Spreng. var. lanata | DALAL |
| woolly prairie clover | Dalea lanata Spreng. var. terminalis (M.E. Jones) Barneby | DALAT |
| woolly round-head clover | Trifolium eriosphaerum Boiss. | TRER7 |
| woolly senna | Senna hirsuta (L.) Irwin & Barneby | SEHI2 |
| woolly senna | Senna hirsuta (L.) Irwin & Barneby var. glaberrima (M.E. Jones) Irwin & Barneby | SEHIG |
| woolly senna | Senna hirsuta (L.) Irwin & Barneby var. hirsuta | SEHIH |
| woollyhead clover | Trifolium eriocephalum Nutt. | TRER2 |
| woollyhead clover | Trifolium eriocephalum Nutt. ssp. arcuatum (Piper) J. Gillett | TRERA2 |
| woollyhead clover | Trifolium eriocephalum Nutt. ssp. eriocephalum | TRERE |
| woollyhead prairie clover | Dalea laniceps Barneby | DALA6 |
| woollypod milkvetch | Astragalus purshii Dougl. ex Hook. | ASPU9 |
| woollypod milkvetch | Astragalus purshii Dougl. ex Hook. var. concinnus Barneby | ASPUC |
| woollypod milkvetch | Astragalus purshii Dougl. ex Hook. var. glareosus (Dougl. ex Hook.) Barneby | ASPUG2 |
| woollypod milkvetch | Astragalus purshii Dougl. ex Hook. var. lagopinus (Rydb.) Barneby | ASPUL |
| woollypod milkvetch | Astragalus purshii Dougl. ex Hook. var. lectulus (S. Wats.) M.E. Jones | ASPUL2 |
| woollypod milkvetch | Astragalus purshii Dougl. ex Hook. var. pumilio Barneby | ASPUP |
| woollypod milkvetch | Astragalus purshii Dougl. ex Hook. var. purshii | ASPUP7 |
| woollypod milkvetch | Astragalus purshii Dougl. ex Hook. var. tinctus M.E. Jones | ASPUT |
| Wooton's holdback | Caesalpinia wootonii (Britt.) Eifert ex Isely | CAWO3 |
| Wright's deervetch | Lotus wrightii (Gray) Greene | LOWR |
| Wright's milkpea | Galactia wrightii Gray | GAWR |
| Wright's milkpea | Galactia wrightii Gray var. mollissima Kearney & Peebles | GAWRM |
| Wright's milkpea | Galactia wrightii Gray var. wrightii | GAWRW |
| Wright's milkvetch | Astragalus wrightii Gray | ASWR |
| Wright's prairie clover | Dalea wrightii Gray | DAWR |
| Wright's sensitive pea | Chamaecrista serpens (L.) Greene var. wrightii (Gray) Irwin & Barneby | CHSEW |
| wrinkled medick | Medicago rugosa Desr. | MERU3 |
| wyalong wattle | Acacia cardiophylla A. Cunn. ex Benth. | ACCA27 |
| Wydler's ticktrefoil | Desmodium wydlerianum Urban | DEWY |
| Wyeth's lupine | Lupinus wyethii S. Wats. | LUWY |
| Wyeth's lupine | Lupinus wyethii S. Wats. ssp. wyethii | LUWYW |
| Wyoming locoweed | Oxytropis nana Nutt. | OXNA |
| Yakima milkvetch | Astragalus reventiformis (Rydb.) Barneby | ASRE6 |
| yam bean | Pachyrhizus ahipa (Wedd.) L. Parodi | PAAH4 |
| yam bean | Pachyrhizus erosus (L.) Urban | PAER3 |
| yardlong bean | Vigna unguiculata (L.) Walp. ssp. sesquipedalis (L.) Verdc. | VIUNS2 |
| yarran | Acacia omalophylla A. Cunn. ex Benth. | ACOM |
| yellow alfalfa | Medicago sativa L. ssp. falcata (L.) Arcang. | MESAF |
| yellow bird's-foot | Ornithopus compressus L. | ORCO15 |
| yellow bird's-foot | Ornithopus pinnatus (P. Mill.) Druce | ORPI3 |
| yellow bush lupine | Lupinus arboreus Sims | LUAR |
| yellow crownvetch | Coronilla scorpioides (L.) W.D.J. Koch | COSC5 |
| yellow milkvetch | Astragalus flavus Nutt. | ASFL |
| yellow necklacepod | Sophora tomentosa L. | SOTO3 |
| yellow necklacepod | Sophora tomentosa L. var. littoralis (Schrad.) Benth. | SOTOL |
| yellow necklacepod | Sophora tomentosa L. var. occidentalis (L.) Isely | SOTOO |
| yellow necklacepod | Sophora tomentosa L. var. truncata Torr. & Gray | SOTOT |
| yellow nicker | Caesalpinia bonduc (L.) Roxb. | CABO6 |
| yellow paloverde | Parkinsonia microphylla Torr. | PAMI5 |
| yellow pea | Lathyrus aphaca L. | LAAP2 |
| yellow puff | Neptunia lutea (Leavenworth) Benth. | NELU2 |
| yellow sweetclover | Melilotus officinalis (L.) Lam. | MEOF |
| yellow wild indigo | Baptisia sphaerocarpa Nutt. | BASP |
| yelloweyes | Lupinus flavoculatus Heller | LUFL |
| yellowflower locoweed | Oxytropis monticola Gray | OXMO2 |
| yellowhood | Nissolia Jacq. | NISSO |
| Yellowstone milkvetch | Astragalus miser Dougl. var. praeteritus Barneby | ASMIP2 |
| yellowwood | Cladrastis Raf. | CLADR |
| Yolla Bolly bird's-foot trefoil | Lotus yollabolliensis Munz | LOYO |
| Yuba lupine | Lupinus purpurascens Heller | LUPU6 |
| yucca milkvetch | Astragalus lentiginosus Dougl. ex Hook. var. yuccanus M.E. Jones | ASLEY |
| Yukon lupine | Lupinus kuschei Eastw. | LUKU |
| Yunnan bauhinia | Bauhinia yunnanensis Franch. | BAYU |
| Zapoteca formosa var. schottii | Calliandra schottii Torr. ex S. Wats. | CASC3 |
| Zapoteca media | Calliandra coulteri S. Wats. | CACO43 |
| Zapoteca media | Calliandra media (Mart. & Galeotti) Standl. | CAME37 |
| Zapoteca portoricensis | Anneslea portoricensis (Jacq.) Britt. | ANPO6 |
| Zapoteca portoricensis | Calliandra portoricensis (Jacq.) Benth. | CAPO10 |
| Zapoteca portoricensis | Mimosa portoricensis Jacq. | MIPO5 |
| zarzabacoa comun | Desmodium incanum DC. | DEIN3 |
| zarzabacoa comun | Desmodium incanum DC. var. angustifolium Griseb. | DEINA |
| zarzabacoa comun | Desmodium incanum DC. var. incanum | DEINI3 |
| zarzabacoa de monte | Desmodium axillare (Sw.) DC. | DEAX |
| zarzabacoa de monte | Desmodium axillare (Sw.) DC. var. acutifolium (Kuntze) Urban | DEAXA |
| zarzabacoa de monte | Desmodium axillare (Sw.) DC. var. axillare | DEAXA2 |
| zarzabacoa de monte | Desmodium axillare (Sw.) DC. var. stoloniferum (L.C. Rich. ex Poir.) Schub. | DEAXS |
| zarzabacoa dulce | Desmodium glabrum (P. Mill.) DC. | DEGL7 |
| zarzabacoa galana | Desmodium adscendens (Sw.) DC. | DEAD |
| zarzabacoa peluda | Desmodium barbatum (L.) Benth. | DEBA5 |
| zigzag clover | Trifolium medium L. | TRME |
| zigzag jointvetch | Aeschynomene rudis Benth. | AERU |
| Zion milkvetch | Astragalus zionis M.E. Jones | ASZI |
| Zion milkvetch | Astragalus zionis M.E. Jones var. vigulus Welsh | ASZIV |
| Zion milkvetch | Astragalus zionis M.E. Jones var. zionis | ASZIZ |
| Zollinger's indigo | Indigofera zollingeriana Miq. | INZO |
| zombi pea | Vigna vexillata (L.) A. Rich. | VIVE |
| zornia | Zornia J.F. Gmel. | ZORNI |
| Zornia gemella | Hedysarum gemellum Willd. ex Vogel (pro syn.) | HEGE2 |
| Zornia gemella | Zornia diphylla auct. non Pers. [misapplied] | ZODI80 |
| Zornia leptophylla | Zornia diphylla (L.) Pers. var. leptophylla Benth. | ZODIL |
| Zuni milkvetch | Astragalus accumbens Sheldon | ASAC2 |