| Common Name | Scientific Name | Code |
| n/a | Cordia sinensis Lam. | COSI9 |
| n/a | Eritrichium rupestre (Pallas ex Georgi) Bunge [excluded] | ERRU8 |
| n/a | Heliotropium arguzioides Kar. & Kir. | HEAR19 |
| n/a | Lappula diploloma (Fisch. & C. A. Mey.) Guerke [excluded] | LADI10 |
| n/a | Lindelofia Lehm. | LINDE3 |
| n/a | Lindelofia longiflora (Benth.) Baill. | LILO4 |
| n/a | Myosotis canescens (Michx.) Lehm. [excluded] | MYCA16 |
| n/a | Symphytum ?uplandicum Nyman (pro sp.) [asperum ? officinale] | SYUP |
| adobe popcornflower | Plagiobothrys acanthocarpus (Piper) I.M. Johnston | PLAC |
| Alaska tall bluebells | Mertensia paniculata (Ait.) G. Don var. alaskana (Britt.) L.O. Williams | MEPAA |
| alkanna | Alkanna Tausch | ALKAN |
| alkanna | Alkanna tinctoria (L.) Tausch | ALTI |
| alpine bluebells | Mertensia alpina (Torr.) G. Don | MEAL7 |
| alpine forget-me-not | Eritrichium Schrad. ex Gaudin | ERITR |
| American stickseed | Hackelia deflexa (Wahlenb.) Opiz var. americana (Gray) Fern. & I.M. Johnston | HADEA |
| American stoneseed | Lithospermum latifolium Michx. | LILA2 |
| amethyst stickseed | Hackelia amethystina J.T. Howell | HAAM |
| Amsinckia eastwoodiae | Amsinckia intermedia Fisch. & C.A. Mey. var. eastwoodiae (J.F. Macbr.) Jepson & Hoover | AMINE |
| Amsinckia lycopsoides | Amsinckia barbata Greene | AMBA6 |
| Amsinckia lycopsoides | Benthamia lycopsoides (Lehm.) Lindl. ex Druce | BELY2 |
| Amsinckia menziesii var. intermedia | Amsinckia arizonica Suksdorf | AMAR7 |
| Amsinckia menziesii var. intermedia | Amsinckia demissa Suksdorf | AMDE5 |
| Amsinckia menziesii var. intermedia | Amsinckia echinata Gray | AMEC |
| Amsinckia menziesii var. intermedia | Amsinckia intactilis J.F. Macbr. | AMIN5 |
| Amsinckia menziesii var. intermedia | Amsinckia intermedia Fisch. & C.A. Mey. | AMIN3 |
| Amsinckia menziesii var. intermedia | Amsinckia intermedia Fisch. & C.A. Mey. var. echinata (Gray) Wiggins | AMINE2 |
| Amsinckia menziesii var. intermedia | Amsinckia microphylla Suksdorf | AMMI2 |
| Amsinckia menziesii var. intermedia | Amsinckia nana Suksdorf | AMNA3 |
| Amsinckia menziesii var. intermedia | Amsinckia rigida Suksdorf | AMRI2 |
| Amsinckia menziesii var. menziesii | Amsinckia hispida auct. non (Ruiz & Pav?n) I.M. Johnston [misapplied] | AMHI |
| Amsinckia menziesii var. menziesii | Amsinckia idahoensis M.E. Jones | AMID |
| Amsinckia menziesii var. menziesii | Amsinckia micrantha Suksdorf | AMMI3 |
| Amsinckia menziesii var. menziesii | Amsinckia parviflora Heller | AMPA9 |
| Amsinckia menziesii var. menziesii | Amsinckia retrorsa Suksdorf | AMRE2 |
| Amsinckia menziesii var. menziesii | Amsinckia rugosa Rydb. | AMRU3 |
| Amsinckia menziesii var. menziesii | Echium menziesii Lehm. | ECME4 |
| Amsinckia spectabilis | Amsinckia scouleri I.M. Johnston | AMSC3 |
| Amsinckia spectabilis | Amsinckia spectabilis Fisch. & C. A. Mey. var. spectabilis Fisch. & C. A. Mey. [superfluous autonym] | AMSPS3 |
| Amsinckia spectabilis | Amsinckia spectabilis Fisch. & C.A. Mey. var. bracteosa (Gray) Boivin | AMSPB |
| Amsinckia spectabilis | Amsinckia spectabilis Fisch. & C.A. Mey. var. microcarpa (Greene) Jepson & Hoover | AMSPM |
| Amsinckia spectabilis | Amsinckia spectabilis Fisch. & C.A. Mey. var. nicolai (Jepson) I.M. Johnston ex Munz | AMSPN |
| Amsinckia tessellata var. gloriosa | Amsinckia gloriosa Eastw. ex Suksdorf | AMGL |
| Amsinckia tessellata var. tessellata | Amsinckia densirugosa Suksdorf | AMDE6 |
| Amsinckia tessellata var. tessellata | Amsinckia hendersonii Suksdorf | AMHE6 |
| Amsinckia tessellata var. tessellata | Amsinckia washingtonensis Suksdorf | AMWA2 |
| Amsinckia vernicosa var. furcata | Amsinckia furcata Suksdorf | AMFU2 |
| anacahuita | Cordia boissieri A. DC. | COBO2 |
| Anchusa arvensis | Lycopsis arvensis L. | LYAR |
| Anchusa azurea | Anchusa italica Retz. | ANIT |
| Anchusa barrelieri | Buglossum barrelieri All. | BUBA2 |
| Anchusa officinalis | Anchusa procera Bess. ex Link | ANPR2 |
| Antilles heliotrope | Heliotropium lagoense (Warm.) Guerke | HELA11 |
| arctic alpine forget-me-not | Eritrichium nanum (Vill.) Schrad. ex Gaudin | ERNA |
| arctic alpine forget-me-not | Eritrichium nanum (Vill.) Schrad. ex Gaudin var. aretioides (Cham.) Herder | ERNAA |
| arctic alpine forget-me-not | Eritrichium nanum (Vill.) Schrad. ex Gaudin var. argenteum (Wight) I.M. Johnston | ERNAA2 |
| arctic alpine forget-me-not | Eritrichium nanum (Vill.) Schrad. ex Gaudin var. chamissonis (DC.) Herder | ERNAC |
| arctic alpine forget-me-not | Eritrichium nanum (Vill.) Schrad. ex Gaudin var. elongatum (Rydb.) Cronq. | ERNAE |
| Argusia gnaphalodes | Mallotonia gnaphalodes (L.) Britt. | MAGN |
| Argusia gnaphalodes | Tournefortia gnaphalodes (L.) R. Br. ex Roemer & J.A. Schultes | TOGN |
| Argusia sibirica | Messerschmidia sibirica (L.) L. | MESI4 |
| Argusia sibirica | Tournefortia sibirica L. | TOSI |
| Arizona grapplinghook | Harpagonella palmeri Gray var. arizonica I.M. Johnston | HAPAA |
| Arizona popcornflower | Plagiobothrys arizonicus (Gray) Greene ex Gray | PLAR |
| Arizona stoneseed | Lithospermum confine I.M. Johnston | LICO9 |
| artist's popcornflower | Plagiobothrys chorisianus (Cham.) I.M. Johnston | PLCH |
| artist's popcornflower | Plagiobothrys chorisianus (Cham.) I.M. Johnston var. chorisianus | PLCHC |
| artist's popcornflower | Plagiobothrys chorisianus (Cham.) I.M. Johnston var. undulatus (Piper) Higgins, comb. nov. ined. | PLCHU |
| Asian forget-me-not | Myosotis asiatica (Vesterg.) Schischkin & Sergievskaja | MYAS2 |
| aspen bluebells | Mertensia arizonica Greene | MEAR6 |
| Assyrian plum | Cordia myxa L. | COMY |
| Atwood's cryptantha | Cryptantha atwoodii Higgins | CRAT2 |
| Austin's popcornflower | Plagiobothrys austiniae (Greene) I.M. Johnston | PLAU |
| Azores forget-me-not | Myosotis azorica H.C. Wats. ex Hook. | MYAZ |
| Bahama manjack | Cordia bahamensis Urban | COBA4 |
| Baker's cryptantha | Cryptantha bakeri (Greene) Payson | CRBA4 |
| Barrelier's bugloss | Anchusa barrelieri (All.) Vitman | ANBA3 |
| basin cryptantha | Cryptantha ambigua (Gray) Greene | CRAM3 |
| basin yellow cryptantha | Cryptantha confertiflora (Greene) Payson | CRCO12 |
| basora | Cordia angustifolia (West ex Willd.) Roemer & J.A. Schultes | COAN11 |
| bay forget-me-not | Myosotis laxa Lehm. | MYLA |
| bearded cryptantha | Cryptantha barbigera (Gray) Greene | CRBA5 |
| bearded popcornflower | Plagiobothrys hystriculus (Piper) I.M. Johnston | PLHY |
| beautiful bluebells | Mertensia bella Piper | MEBE |
| beggarslice | Hackelia virginiana (L.) I.M. Johnston | HAVI2 |
| bejuco de masa | Tournefortia maculata Jacq. | TOMA |
| bentflower fiddleneck | Amsinckia lunaris J.F. Macbr. | AMLU |
| Bessey's stickseed | Hackelia besseyi (Rydb.) J.L. Gentry | HABE3 |
| Bethlehem lungwort | Pulmonaria saccharata P. Mill. | PUSA2 |
| black-sage | Cordia polycephala (Lam.) I.M. Johnston | COPO3 |
| bluebells | Mertensia Roth | MERTE |
| bluedevil | Echium pustulatum Sibthorp & Sm. | ECPU2 |
| bodywood | Bourreria succulenta Jacq. | BOSU2 |
| borage | Borago L. | BORAG |
| bothriospermum | Bothriospermum Bunge | BOTHR2 |
| Bourreria radula | Bourreria revoluta Kunth | BORE5 |
| Bourreria radula | Bourreria succulenta Jacq. var. revoluta (Kunth) O.E. Schulz | BOSUR |
| Bourreria succulenta | Bourreria domingensis auct. non (DC.) Griseb. [misapplied] | BODO |
| Bourreria succulenta | Bourreria ovata Miers | BOOV |
| bracted popcornflower | Plagiobothrys bracteatus (T.J. Howell) I.M. Johnston | PLBR |
| bracted popcornflower | Plagiobothrys bracteatus (T.J. Howell) I.M. Johnston var. aculeolatus (Piper) I.M. Johnston | PLBRA |
| bracted popcornflower | Plagiobothrys bracteatus (T.J. Howell) I.M. Johnston var. bracteatus | PLBRB |
| Brenda's yellow cryptantha | Cryptantha flava (A. Nels.) Payson | CRFL5 |
| bristlecone cryptantha | Cryptantha roosiorum Munz | CRRO3 |
| bristly cryptantha | Cryptantha setosissima (Gray) Payson | CRSE5 |
| bristly fiddleneck | Amsinckia tessellata Gray | AMTE3 |
| bristly fiddleneck | Amsinckia tessellata Gray var. gloriosa (Eastw. ex Suksdorf) Hoover | AMTEG |
| bristly fiddleneck | Amsinckia tessellata Gray var. tessellata | AMTET |
| bristly stickseed | Hackelia setosa (Piper) I.M. Johnston | HASE |
| broadfruit combseed | Pectocarya platycarpa (Munz & Johnston) Munz & Johnston | PEPL |
| broadleaf bluebells | Mertensia platyphylla Heller | MEPL |
| broadleaf bluebells | Mertensia platyphylla Heller var. platyphylla | MEPLP |
| broadleaf bluebells | Mertensia platyphylla Heller var. subcordata (Greene) L.O. Williams | MEPLS |
| broadleaf forget-me-not | Myosotis latifolia Poir. | MYLA4 |
| brunnera | Brunnera C. Steven | BRUNN2 |
| Brunnera macrophylla | Myosotis macrophylla J.F. Adams | MYMA8 |
| bugloss | Anchusa L. | ANCHU |
| buglossoides | Buglossoides Moench | BUGLO |
| Buglossoides arvensis | Lithospermum arvense L. | LIAR4 |
| bushloving cryptantha | Cryptantha dumetorum (Greene ex Gray) Greene | CRDU |
| bushy cryptantha | Cryptantha racemosa (S. Wats.) Greene | CRRA2 |
| bushy heliotrope | Heliotropium ternatum Vahl | HETE10 |
| buttecandle | Cryptantha celosioides (Eastw.) Payson | CRCE |
| calcareous cryptantha | Cryptantha thyrsiflora (Greene) Payson | CRTH |
| California popcornflower | Plagiobothrys distantiflorus (Piper) I.M. Johnston ex M.E. Peck | PLDI2 |
| California stickseed | Hackelia californica (Gray) I.M. Johnston | HACA |
| California stoneseed | Lithospermum californicum Gray | LICA11 |
| Calistoga popcornflower | Plagiobothrys strictus (Greene) I.M. Johnston | PLST2 |
| canyon cryptantha | Cryptantha tenuis (Eastw.) Payson | CRTE8 |
| Cape bugloss | Anchusa capensis Thunb. | ANCA29 |
| capitate cryptantha | Cryptantha capitata (Eastw.) I.M. Johnston | CRCA13 |
| Carolina puccoon | Lithospermum caroliniense (Walt. ex J.F. Gmel.) MacM. | LICA13 |
| Carolina puccoon | Lithospermum caroliniense (Walt. ex J.F. Gmel.) MacM. var. caroliniense | LICAC8 |
| Carolina puccoon | Lithospermum caroliniense (Walt. ex J.F. Gmel.) MacM. var. croceum (Fern.) Cronq. | LICAC9 |
| Cascade popcornflower | Plagiobothrys hispidus Gray | PLHI3 |
| Catalina popcornflower | Plagiobothrys canescens Benth. var. catalinensis (Gray) Jepson | PLCAC4 |
| Ceylon hound's tongue | Cynoglossum furcatum Wallich ex Roxb. | CYFU8 |
| changing forget-me-not | Myosotis discolor Pers. | MYDI |
| chiggery grapes | Tournefortia hirsutissima L. | TOHI |
| Chihuahuan stickseed | Hackelia ursina (Greene ex Gray) I.M. Johnston | HAUR |
| Chihuahuan stickseed | Hackelia ursina (Greene ex Gray) I.M. Johnston var. diaboli J.L. Gentry | HAURD |
| Chihuahuan stickseed | Hackelia ursina (Greene ex Gray) I.M. Johnston var. pustulata (J.F. Macbr.) J.L. Gentry | HAURP |
| Chihuahuan stickseed | Hackelia ursina (Greene ex Gray) I.M. Johnston var. ursina | HAURU |
| Chinati stoneseed | Lithospermum calycosum (J.F. Macbr.) I.M. Johnston | LICA18 |
| Chinese hound's tongue | Cynoglossum amabile Stapf & Drummond | CYAM3 |
| chuckwalla combseed | Pectocarya heterocarpa (I.M. Johnston) I.M. Johnston | PEHE |
| clammy cherry | Cordia obliqua Willd. | COOB3 |
| clasping heliotrope | Heliotropium amplexicaule Vahl | HEAM4 |
| Clearwater cryptantha | Cryptantha intermedia (Gray) Greene | CRIN8 |
| Cleveland's cryptantha | Cryptantha clevelandii Greene | CRCL |
| Cleveland's cryptantha | Cryptantha clevelandii Greene var. clevelandii | CRCLC |
| Cleveland's cryptantha | Cryptantha clevelandii Greene var. dissita (I.M. Johnston) Jepson & Hoover | CRCLD |
| Cleveland's cryptantha | Cryptantha clevelandii Greene var. florosa I.M. Johnston | CRCLF |
| cliffdweller's cryptantha | Cryptantha elata (Eastw.) Payson | CREL4 |
| Clokey's cryptantha | Cryptantha clokeyi I.M. Johnston | CRCL2 |
| clustered popcornflower | Plagiobothrys glomeratus Gray | PLGL4 |
| coast range cryptantha | Cryptantha corollata (I.M. Johnston) I.M. Johnston | CRCO33 |
| coastal cryptantha | Cryptantha leiocarpa (Fisch. & C.A. Mey.) Greene | CRLE4 |
| coastal plain heliotrope | Heliotropium racemosum Rose & Standl. | HERA5 |
| cold withe | Tournefortia filiflora Griseb. | TOFI |
| Colusa cryptantha | Cryptantha nemaclada Greene | CRNE |
| combseed | Pectocarya DC. ex Meisn. | PECTO |
| comfrey | Symphytum L. | SYMPH2 |
| common borage | Borago officinalis L. | BOOF |
| common bugloss | Anchusa officinalis L. | ANOF |
| common comfrey | Symphytum officinale L. | SYOF |
| common fiddleneck | Amsinckia menziesii (Lehm.) A. Nels. & J.F. Macbr. var. intermedia (Fisch & C.A. Mey.) Ganders | AMMEI2 |
| common lungwort | Pulmonaria officinalis L. [excluded] | PUOF |
| common viper's bugloss | Echium vulgare L. | ECVU |
| compact cryptantha | Cryptantha compacta Higgins | CRCO17 |
| Cooper's popcornflower | Plagiobothrys collinus (Phil.) I.M. Johnston | PLCO13 |
| Cooper's popcornflower | Plagiobothrys collinus (Phil.) I.M. Johnston var. californicus (Gray) Higgins | PLCOC |
| Cooper's popcornflower | Plagiobothrys collinus (Phil.) I.M. Johnston var. fulvescens (I.M. Johnston) Higgins | PLCOF |
| Cooper's popcornflower | Plagiobothrys collinus (Phil.) I.M. Johnston var. gracilis (I.M. Johnston) Higgins | PLCOG |
| Cooper's popcornflower | Plagiobothrys collinus (Phil.) I.M. Johnston var. ursinus (Gray) Higgins | PLCOU |
| cordia | Cordia L. | CORDI |
| Cordia alliodora | Cerdana alliodora Ruiz & Pav?n | CEAL5 |
| Cordia angustifolia | Cordia stenophylla Alain | COST8 |
| Cordia angustifolia | Varronia angustifolia West ex Willd. | VAAN4 |
| Cordia bahamensis | Varronia bahamensis (Urban) Millsp. | VABA2 |
| Cordia bellonis | Varronia bellonis (Urban) Britt. | VABE2 |
| Cordia collococca | Cordia glabra auct. non L. [misapplied] | COGL11 |
| Cordia globosa | Cordia bullata (L.) Roemer & J.A. Schultes ssp. humilis (Jacq.) Gaviria | COBUH |
| Cordia globosa | Cordia globosa (Jacq.) Kunth var. humilis (Jacq.) I.M. Johnston | COGLH |
| Cordia globosa | Cordia humilis Jacq. | COHU |
| Cordia globosa var. globosa | Varronia globosa Jacq. [excluded] | VAGL5 |
| Cordia laevigata | Cordia nitida Vahl ex West | CONI |
| Cordia lima | Varronia lima Desv. | VALI |
| Cordia polycephala | Varronia corymbosa (L.) Desv. | VACO5 |
| Cordia rickseckeri | Sebesten rickseckeri (Millsp.) Britt. | SERI5 |
| Cordia rupicola | Varronia rupicola (Urban) Britt. | VARU |
| Cordia sebestena | Sebesten sebestena (L.) Britt. ex Small | SESE12 |
| corn gromwell | Buglossoides arvensis (L.) I.M. Johnston | BUAR3 |
| cotorrilla | Heliotropium guanicense Urban | HEGU2 |
| Cotton's stickseed | Hackelia diffusa (Lehm.) I.M. Johnston var. cottonii (Piper) R.L. Carr | HADIC |
| Cretan viper's bugloss | Echium creticum L. | ECCR3 |
| Creutzfeldt's cryptantha | Cryptantha creutzfeldtii Welsh | CRCR8 |
| crinklemat | Tiquilia Pers. | TIQUI |
| Cronquist's stickseed | Hackelia cronquistii J.L. Gentry | HACR4 |
| cryptantha | Cryptantha Lehm. ex G. Don | CRYPT |
| Cryptantha angustifolia | Eremocarya angustifolia Torr. | ERAN13 |
| Cryptantha aperta | Oreocarya aperta Eastw. | ORAP |
| Cryptantha bakeri | Oreocarya bakeri Greene | ORBA4 |
| Cryptantha breviflora | Oreocarya breviflora Osterhout | ORBR3 |
| Cryptantha caespitosa | Oreocarya caespitosa A. Nels. | ORCA8 |
| Cryptantha cana | Oreocarya cana A. Nels. | ORCA11 |
| Cryptantha celosioides | Cryptantha bradburiana Payson | CRBR11 |
| Cryptantha celosioides | Cryptantha macounii (Eastw.) Payson | CRMA16 |
| Cryptantha celosioides | Cryptantha nubigena (Greene) Payson var. macounii (Eastw.) Boivin | CRNUM |
| Cryptantha celosioides | Cryptantha sheldonii (Brand) Payson | CRSH2 |
| Cryptantha celosioides | Oreocarya celosioides Eastw. | ORCE2 |
| Cryptantha celosioides | Oreocarya glomerata (Pursh) Greene, non Lehm. ex Fisch. | ORGL |
| Cryptantha celosioides | Oreocarya macounii Eastw. | ORMA5 |
| Cryptantha celosioides | Oreocarya sheldonii Brand | ORSH |
| Cryptantha cinerea var. abortiva | Cryptantha jamesii (Torr.) Payson var. abortiva (Greene) Payson | CRJAA |
| Cryptantha cinerea var. abortiva | Oreocarya abortiva Greene | ORAB |
| Cryptantha cinerea var. cinerea | Cryptantha jamesii (Torr.) Payson var. cinerea (Greene) Payson | CRJAC |
| Cryptantha cinerea var. cinerea | Cryptantha jamesii (Torr.) Payson var. multicaulis (Torr.) Payson | CRJAM |
| Cryptantha cinerea var. cinerea | Cryptantha jamesii (Torr.) Payson var. setosa (M.E. Jones) I.M. Johnston ex Tidestrom | CRJAS |
| Cryptantha cinerea var. jamesii | Cryptantha jamesii (Torr.) Payson | CRJA2 |
| Cryptantha cinerea var. jamesii | Cryptantha jamesii (Torr.) Payson var. disticha (Eastw.) Payson | CRJAD |
| Cryptantha cinerea var. jamesii | Cryptantha jamesii (Torr.) Payson var. typica Payson | CRJAT |
| Cryptantha cinerea var. jamesii | Cryptantha suffruticosa Piper | CRSU14 |
| Cryptantha cinerea var. jamesii | Krynitzkia jamesii Gray | KRJA |
| Cryptantha cinerea var. jamesii | Oreocarya suffruticosa (Piper) Greene | ORSU2 |
| Cryptantha cinerea var. laxa | Cryptantha jamesii (Torr.) Payson var. laxa (J.F. Macbr.) Payson | CRJAL |
| Cryptantha cinerea var. pustulosa | Cryptantha jamesii (Torr.) Payson var. pustulosa (Rydb.) Harrington | CRJAP |
| Cryptantha cinerea var. pustulosa | Cryptantha pustulosa (Rydb.) Payson | CRPU10 |
| Cryptantha cinerea var. pustulosa | Oreocarya pustulosa Rydb. | ORPU14 |
| Cryptantha circumscissa var. circumscissa | Cryptantha circumscissa (Hook. & Arn.) I.M. Johnston var. genuina I.M. Johnston | CRCIG |
| Cryptantha circumscissa var. circumscissa | Greeneocharis circumscissa (Hook. & Arn.) Rydb. | GRCI |
| Cryptantha circumscissa var. hispida | Greeneocharis circumscissa (Hook. & Arn.) Rydb. var. hispida J.F. Macbr. | GRCIH |
| Cryptantha circumscissa var. rosulata | Cryptantha circumscissa (Hook. & Arn.) I.M. Johnston ssp. rosulata (J.T. Howell) Mathew & Raven | CRCIR2 |
| Cryptantha clevelandii var. florosa | Cryptantha hispidissima Greene | CRHI2 |
| Cryptantha clokeyi | Cryptantha muricata (Hook. & Arn.) A. Nels. & J.F. Macbr. var. clokeyi (I.M. Johnston) Jepson | CRMUC |
| Cryptantha confertiflora | Oreocarya confertiflora Greene | ORCO6 |
| Cryptantha costata | Cryptantha saxorum Jepson | CRSA12 |
| Cryptantha crassisepala | Krynitzkia crassisepala Gray | KRCR |
| Cryptantha crymophila | Oreocarya crymophila (I.M. Johnston) Jepson & Hoover | ORCR2 |
| Cryptantha elata | Oreocarya elata Eastw. | OREL2 |
| Cryptantha fendleri | Cryptantha pattersonii (Gray) Greene | CRPA7 |
| Cryptantha flaccida | Cryptantha rostellata (Greene) Greene | CRRO4 |
| Cryptantha flaccida | Cryptantha rostellata (Greene) Greene var. spithamea (I.M. Johnston) Jepson | CRROS |
| Cryptantha flava | Oreocarya flava A. Nels. | ORFL2 |
| Cryptantha flavoculata | Oreocarya flavoculata A. Nels. | ORFL3 |
| Cryptantha fulvocanescens var. fulvocanescens | Cryptantha echinoides (M.E. Jones) Payson | CREC2 |
| Cryptantha fulvocanescens var. fulvocanescens | Cryptantha fulvocanescens (S. Wats.) Payson var. echinoides (M.E. Jones) Higgins | CRFUE |
| Cryptantha fulvocanescens var. fulvocanescens | Oreocarya fulvocanescens (S. Wats.) Greene | ORFU3 |
| Cryptantha fulvocanescens var. nitida | Oreocarya nitida Greene | ORNI |
| Cryptantha hoffmannii | Oreocarya hoffmannii (I.M. Johnston) Abrams | ORHO |
| Cryptantha holoptera | Cryptantha inaequata I.M. Johnston | CRIN6 |
| Cryptantha holoptera | Eritrichium holopterum Gray | ERHO14 |
| Cryptantha humilis | Cryptantha alpicola Cronq. | CRAL9 |
| Cryptantha humilis | Cryptantha humilis (Gray) Payson var. commixta (J.F. Macbr.) Higgins | CRHUC |
| Cryptantha humilis | Cryptantha humilis (Gray) Payson var. nana (Eastw.) Higgins | CRHUN |
| Cryptantha humilis | Cryptantha humilis (Gray) Payson var. ovina (Payson) Higgins | CRHUO |
| Cryptantha humilis | Cryptantha humilis (Gray) Payson var. shantzii (Tidestrom) Higgins | CRHUS |
| Cryptantha humilis | Cryptantha nana (Eastw.) Payson | CRNA2 |
| Cryptantha humilis | Cryptantha nana (Eastw.) Payson var. commixta (J.F. Macbr.) Payson | CRNAC2 |
| Cryptantha humilis | Cryptantha nana (Eastw.) Payson var. ovina Payson | CRNAO |
| Cryptantha humilis | Cryptantha nana (Eastw.) Payson var. shantzii (Tidestrom) Payson | CRNAS |
| Cryptantha humilis | Cryptantha nana (Eastw.) Payson var. typica Payson | CRNAT |
| Cryptantha humilis | Oreocarya humilis (Gray) Greene | ORHU2 |
| Cryptantha humilis | Oreocarya humilis (Gray) Greene ssp. nana (Eastw.) W.A. Weber | ORHUN |
| Cryptantha intermedia | Cryptantha barbigera (Gray) Greene var. fergusoniae J.F. Macbr. | CRBAF |
| Cryptantha intermedia | Cryptantha fragilis M.E. Peck | CRFR2 |
| Cryptantha intermedia | Cryptantha grandiflora Rydb. | CRGR7 |
| Cryptantha intermedia | Cryptantha hendersonii (A. Nels.) Piper ex J.C. Nels. | CRHE2 |
| Cryptantha intermedia | Cryptantha intermedia (Gray) Greene var. grandiflora (Rydb.) Cronq. | CRING |
| Cryptantha leucophaea | Oreocarya leucophaea (Dougl. ex Lehm.) Greene | ORLE |
| Cryptantha longiflora | Oreocarya longiflora A. Nels. | ORLO |
| Cryptantha mensana | Oreocarya mensana M.E. Jones | ORME |
| Cryptantha micrantha var. lepida | Cryptantha micrantha (Torr.) I.M. Johnston ssp. lepida (Gray) Mathew & Raven | CRMIL |
| Cryptantha micrantha var. lepida | Eremocarya micrantha (Torr.) Greene var. lepida (Gray) J.F. Macbr. | ERMIL6 |
| Cryptantha micrantha var. micrantha | Eremocarya micrantha (Torr.) Greene | ERMI11 |
| Cryptantha muricata | Cryptantha muricata (Hook. & Arn.) A. Nels. & J.F. Macbr. var. denticulata (Greene) I.M. Johnston | CRMUD |
| Cryptantha muricata | Cryptantha muricata (Hook. & Arn.) A. Nels. & J.F. Macbr. var. jonesii (Gray) I.M. Johnston | CRMUJ |
| Cryptantha muricata | Cryptantha muricata (Hook. & Arn.) A. Nels. & J.F. Macbr. var. muricata (Hook. & Arn.) A. Nels. & J.F. Macbr. [superfluous autonym] | CRMUM |
| Cryptantha nubigena | Oreocarya nubigena Greene | ORNU2 |
| Cryptantha osterhoutii | Oreocarya osterhoutii Payson | OROS |
| Cryptantha oxygona | Eritrichium oxygonum Gray | EROX3 |
| Cryptantha palmeri | Cryptantha coryi I.M. Johnston | CRCO14 |
| Cryptantha paradoxa | Oreocarya paradoxa A. Nels. | ORPA4 |
| Cryptantha propria | Oreocarya propria A. Nels. & J.F. Macbr. | ORPR |
| Cryptantha pterocarya var. cycloptera | Cryptantha pterocarya (Torr.) Greene var. purpusii Jepson | CRPTP |
| Cryptantha pusilla | Eritrichium pusillum Torr. & Gray | ERPU16 |
| Cryptantha rattanii | Cryptantha corollata (I.M. Johnston) I.M. Johnston ssp. rattanii (Greene) Abrams | CRCOR |
| Cryptantha rollinsii | Oreocarya rollinsii (I.M. Johnston) W.A. Weber | ORRO4 |
| Cryptantha sericea | Cryptantha sericea (Gray) Payson var. perennis (A. Nels.) Payson | CRSEP |
| Cryptantha sericea | Oreocarya sericea (Gray) Greene | ORSE3 |
| Cryptantha shackletteana | Cryptantha shacklettiana Higgins [orthographic error] | CRSH |
| Cryptantha sobolifera | Cryptantha hypsophila I.M. Johnston | CRHY |
| Cryptantha sobolifera | Cryptantha schoolcraftii Tiehm | CRSC3 |
| Cryptantha sobolifera | Cryptantha subretusa I.M. Johnston | CRSU9 |
| Cryptantha sobolifera | Oreocarya subretusa (I.M. Johnston) Abrams | ORSU3 |
| Cryptantha spiculifera | Oreocarya spiculifera Piper | ORSP3 |
| Cryptantha stricta | Oreocarya stricta Osterhout | ORST2 |
| Cryptantha thompsonii | Oreocarya thompsonii (I.M. Johnston) Abrams | ORTH2 |
| Cryptantha thyrsiflora | Oreocarya thyrsiflora Greene | ORTH3 |
| Cryptantha torreyana | Cryptantha calycosa (Gray) Rydb. | CRCA14 |
| Cryptantha torreyana | Cryptantha eastwoodiae St. John | CREA |
| Cryptantha torreyana | Cryptantha flexulosa (A. Nels.) A. Nels. | CRFL12 |
| Cryptantha torreyana | Cryptantha torreyana (Gray) Greene var. calycosa (Gray) Greene | CRTOC |
| Cryptantha torreyana | Cryptantha torreyana (Gray) Greene var. pumila (Heller) I.M. Johnston | CRTOP |
| Cryptantha tumulosa | Oreocarya tumulosa Payson | ORTU |
| Cryptantha utahensis | Krynitzkia utahensis Gray | KRUT |
| Cryptantha virgata | Oreocarya virgata (Porter) Greene | ORVI4 |
| Cryptantha virginensis | Oreocarya virginensis (M.E. Jones) J.F. Macbr. | ORVI3 |
| Cryptantha weberi | Oreocarya weberi (I.M. Johnston) W.A. Weber | ORWE2 |
| curaciao bush | Cordia globosa (Jacq.) Kunth | COGL6 |
| curaciao bush | Cordia globosa (Jacq.) Kunth var. globosa (Jacq.) Kunth [excluded] | COGLG2 |
| curvenut combseed | Pectocarya recurvata I.M. Johnston | PERE |
| curvenut cryptantha | Cryptantha recurvata Coville | CRRE5 |
| cushion cryptantha | Cryptantha circumscissa (Hook. & Arn.) I.M. Johnston | CRCI2 |
| cushion cryptantha | Cryptantha circumscissa (Hook. & Arn.) I.M. Johnston var. circumscissa | CRCIC2 |
| cushion cryptantha | Cryptantha circumscissa (Hook. & Arn.) I.M. Johnston var. hispida (J.F. Macbr.) I.M. Johnston | CRCIH |
| cushion cryptantha | Cryptantha circumscissa (Hook. & Arn.) I.M. Johnston var. rosulata J.T. Howell | CRCIR |
| Cusick's popcornflower | Plagiobothrys scouleri (Hook. & Arn.) I.M. Johnston var. cusickii (Greene) Higgins | PLSCC |
| Cusick's stickseed | Hackelia cusickii (Piper) Brand | HACU |
| Cynoglossum furcatum | Cynoglossum zeylanicum (Vahl) Thunb. ex Lehm. | CYZE |
| Cynoglossum glochidiatum | Cynoglossum wallichii G. Don var. glochidiatum (Wallich ex Benth.) Kazmi | CYWAG |
| Cynoglossum virginianum var. boreale | Cynoglossum boreale Fern. | CYBO |
| Davis's stickseed | Hackelia davisii Cronq. | HADA |
| deceptive marbleseed | Onosmodium decipiens J. Allison | ONDE2 |
| deepscar cryptantha | Cryptantha excavata Brandeg. | CREX |
| dentnut cryptantha | Cryptantha abata I.M. Johnston | CRAB2 |
| desert cryptantha | Cryptantha similis Mathew & Raven | CRSI4 |
| Douglas's fiddleneck | Amsinckia douglasiana A. DC. | AMDO |
| Drummond's bluebells | Mertensia drummondii (Lehm.) G. Don | MEDR |
| dwarf heliotrope | Heliotropium supinum L. | HESU6 |
| dwarf popcornflower | Plagiobothrys humistratus (Greene) I.M. Johnston | PLHU |
| dye popcornflower | Plagiobothrys infectivus I.M. Johnston | PLIN |
| Eastwood's bluebells | Mertensia paniculata (Ait.) G. Don var. eastwoodiae (J.F. Macbr.) Hult | MEPAE |
| Eastwood's fiddleneck | Amsinckia eastwoodiae J.F. Macbr. | AMEA2 |
| Echium candicans | Echium fastuosum auct. non Ait. [misapplied] | ECFA3 |
| Echium creticum | Echium australe Lam. | ECAU |
| Echium plantagineum | Echium lycopsis L. p.p. | ECLY |
| Echium pustulatum | Echium vulgare L. var. pustulatum (Sibthorp & Sm.) Coincy | ECVUP |
| ehretia | Ehretia P. Br. | EHRET |
| Ehretia anacua | Ehretia elliptica DC. | EHEL2 |
| Elko cryptantha | Cryptantha interrupta (Greene) Payson | CRIN9 |
| Eritrichium nanum var. aretioides | Eritrichium aretioides (Cham.) A. DC. | ERAR10 |
| Eritrichium nanum var. aretioides | Eritrichium elongatum (Rydb.) Wight var. aretioides (Cham.) I.M. Johnston | ERELA2 |
| Eritrichium nanum var. chamissonis | Eritrichium chamissonis DC. | ERCH12 |
| Eritrichium nanum var. elongatum | Eritrichium elongatum (Rydb.) Wight | EREL11 |
| espino | Rochefortia spinosa (Jacq.) Urban | ROSP8 |
| European heliotrope | Heliotropium europaeum L. | HEEU |
| European stickseed | Lappula squarrosa (Retz.) Dumort. | LASQ |
| European stoneseed | Lithospermum officinale L. | LIOF |
| evergreen bugloss | Pentaglottis sempervirens (L.) Tausch ex Bailey | PESE10 |
| fanleaf crinklemat | Tiquilia plicata (Torr.) A. Richards. | TIPL2 |
| fiddleneck | Amsinckia Lehm. | AMSIN |
| field forget-me-not | Myosotis arvensis (L.) Hill | MYAR |
| finebranched popcornflower | Plagiobothrys leptocladus (Greene) I.M. Johnston | PLLE |
| flatspine stickseed | Lappula occidentalis (S. Wats.) Greene | LAOC3 |
| flatspine stickseed | Lappula occidentalis (S. Wats.) Greene var. cupulata (Gray) Higgins | LAOCC |
| flatspine stickseed | Lappula occidentalis (S. Wats.) Greene var. occidentalis | LAOCO |
| forget-me-not | Myosotis L. | MYOSO |
| forget-me-not popcornflower | Plagiobothrys myosotoides (Lehm.) Brand | PLMY |
| forked green fiddleneck | Amsinckia vernicosa Hook. & Arn. var. furcata (Suksdorf) Hoover | AMVEF |
| fourspike heliotrope | Heliotropium procumbens P. Mill. | HEPR3 |
| fourspike heliotrope | Heliotropium procumbens P. Mill. var. depressum (Cham.) Fosberg | HEPRD |
| fourspike heliotrope | Heliotropium procumbens P. Mill. var. procumbens | HEPRP2 |
| fragrant cryptantha | Cryptantha grahamii I.M. Johnston | CRGR4 |
| fragrant heliotrope | Heliotropium greggii Torr. | HEGR6 |
| fragrant manjack | Cordia dichotoma G. Forst. | CODI18 |
| fragrant popcornflower | Plagiobothrys figuratus (Piper) I.M. Johnston ex M.E. Peck | PLFI |
| fragrant popcornflower | Plagiobothrys figuratus (Piper) I.M. Johnston ex M.E. Peck ssp. corallicarpus (Piper) Chambers | PLFIC |
| fragrant popcornflower | Plagiobothrys figuratus (Piper) I.M. Johnston ex M.E. Peck ssp. figuratus | PLFIF |
| Franciscan bluebells | Mertensia franciscana Heller | MEFR2 |
| fulvous popcornflower | Plagiobothrys fulvus (Hook. & Arn.) I.M. Johnston | PLFU |
| fulvous popcornflower | Plagiobothrys fulvus (Hook. & Arn.) I.M. Johnston var. campestris (Greene) I.M. Johnston | PLFUC |
| Gander's cryptantha | Cryptantha ganderi I.M. Johnston | CRGA2 |
| garden heliotrope | Heliotropium arborescens L. | HEAR16 |
| German-madwort | Asperugo L. | ASPER |
| German-madwort | Asperugo procumbens L. | ASPR |
| giant forget-me-not | Myosotidium Hook. | MYOSO3 |
| giant forget-me-not | Myosotidium hortensia (Decne.) Baill. | MYHO4 |
| giant-trumpets | Macromeria D. Don | MACRO |
| giant-trumpets | Macromeria viridiflora DC. | MAVI |
| giant-trumpets | Macromeria viridiflora DC. var. viridiflora | MAVIV |
| Grand Junction cryptantha | Cryptantha aperta (Eastw.) Payson | CRAP2 |
| grapplinghook | Harpagonella Gray | HARPA |
| gravelbar cryptantha | Cryptantha decipiens (M.E. Jones) Heller | CRDE |
| gray cryptantha | Cryptantha leucophaea (Dougl. ex Lehm.) Payson | CRLE6 |
| gray stickseed | Hackelia cinerea (Piper) I.M. Johnston | HACI2 |
| Great Basin popcornflower | Plagiobothrys kingii (S. Wats.) Gray | PLKI |
| Great Basin popcornflower | Plagiobothrys kingii (S. Wats.) Gray var. kingii | PLKIK |
| Great Plains stickseed | Lappula cenchrusoides A. Nels. | LACE |
| greater showy stickseed | Hackelia bella (J.F. Macbr.) I.M. Johnston | HABE |
| green fiddleneck | Amsinckia vernicosa Hook. & Arn. | AMVE |
| green fiddleneck | Amsinckia vernicosa Hook. & Arn. var. vernicosa | AMVEV |
| green stoneseed | Lithospermum viride Greene | LIVI2 |
| Greene's popcornflower | Plagiobothrys greenei (Gray) I.M. Johnston | PLGR |
| greeneye heliotrope | Heliotropium glabriusculum (Torr.) Gray | HEGL3 |
| greenheart ebony | Rochefortia acanthophora (DC.) Griseb. | ROAC2 |
| Guadalupe cryptantha | Cryptantha maritima (Greene) Greene | CRMA7 |
| Guadalupe cryptantha | Cryptantha maritima (Greene) Greene var. maritima | CRMAM |
| Guadalupe cryptantha | Cryptantha maritima (Greene) Greene var. pilosa I.M. Johnston | CRMAP |
| gypsyflower | Cynoglossum officinale L. | CYOF |
| Hackelia besseyi | Hackelia grisea (Woot. & Standl.) I.M. Johnston | HAGR2 |
| Hackelia cronquistii | Hackelia patens (Nutt.) I.M. Johnston var. semiglabra Cronq. | HAPAS |
| Hackelia deflexa var. americana | Hackelia americana (Gray) Fern. | HAAM2 |
| Hackelia deflexa var. americana | Hackelia deflexa (Wahlenb.) Opiz ssp. americana (Gray) A.& D. L?ve | HADEA2 |
| Hackelia deflexa var. americana | Lappula americana (Gray) Rydb. | LAAM4 |
| Hackelia deflexa var. americana | Lappula deflexa (Wahlenb.) Garcke p.p. | LADE9 |
| Hackelia deflexa var. americana | Lappula deflexa (Wahlenb.) Garcke ssp. americana (Gray) Hult | LADEA |
| Hackelia deflexa var. americana | Lappula deflexa (Wahlenb.) Garcke var. americana (Gray) Greene | LADEA2 |
| Hackelia diffusa var. arida | Hackelia arida (Piper) I.M. Johnston | HAAR3 |
| Hackelia diffusa var. arida | Lappula arida Piper | LAAR5 |
| Hackelia diffusa var. diffusa | Hackelia saxatilis (Piper) Brand | HASA4 |
| Hackelia diffusa var. diffusa | Lappula diffusa (Lehm.) Greene | LADI7 |
| Hackelia floribunda | Hackelia leptophylla (Rydb.) I.M. Johnston | HALE4 |
| Hackelia floribunda | Lappula floribunda (Lehm.) Greene | LAFL5 |
| Hackelia hispida var. hispida | Lappula hispida (Gray) Greene | LAHI6 |
| Hackelia micrantha | Hackelia jessicae (McGregor) Brand | HAJE |
| Hackelia patens var. patens | Hackelia diffusa (Lehm.) I.M. Johnston var. caerulescens (Rydb.) I.M. Johnston | HADIC2 |
| Hackelia velutina | Hackelia longituba I.M. Johnston | HALO |
| Hackelia virginiana | Lappula virginiana (L.) Greene | LAVI7 |
| Hackelia virginiana | Myosotis virginiana L. | MYVI |
| hairless popcornflower | Plagiobothrys glaber (Gray) I.M. Johnston | PLGL |
| hairy crinklemat | Tiquilia hispidissima (Torr. & Gray) A. Richards. | TIHI |
| handsome cryptantha | Cryptantha paradoxa (A. Nels.) Payson | CRPA6 |
| Harness's popcornflower | Plagiobothrys kingii (S. Wats.) Gray var. harknessii (Greene) Jepson | PLKIH |
| Harrison's stickseed | Hackelia patens (Nutt.) I.M. Johnston var. harrisonii J.L. Gentry | HAPAH |
| heliotrope | Heliotropium L. | HELIO3 |
| Heliotropium amplexicaule | Cochranea anchusifolia (Poir.) Guerke | COAN13 |
| Heliotropium amplexicaule | Heliotropium anchusifolium Poir. | HEAN7 |
| Heliotropium angiospermum | Heliotropium parviflorum L. | HEPA18 |
| Heliotropium angiospermum | Schobera angiosperma (Murr.) Britt. | SCAN7 |
| Heliotropium arborescens | Heliotropium peruvianum L. | HEPE6 |
| Heliotropium convolvulaceum var. californicum | Euploca convolvulacea Nutt. ssp. californica (Greene) Abrams | EUCOC2 |
| Heliotropium convolvulaceum var. californicum | Heliotropium californicum Greene | HECA26 |
| Heliotropium convolvulaceum var. convolvulaceum | Euploca convolvulacea Nutt. | EUCO16 |
| Heliotropium curassavicum var. obovatum | Heliotropium spathulatum Rydb. | HESP2 |
| Heliotropium curassavicum var. oculatum | Heliotropium curassavicum L. ssp. oculatum (Heller) Thorne | HECUO3 |
| Heliotropium fruticosum | Heliotropium phyllostachyum Torr. | HEPH |
| Heliotropium indicum | Tiaridium indicum (L.) Lehm. | TIIN |
| Heliotropium lagoense | Heliotropium antillanum Urban | HEAN9 |
| Heliotropium microphyllum | Heliotropium crispiflorum Urban | HECR10 |
| Heliotropium polyphyllum | Heliotropium horizontale Small | HEHO6 |
| Heliotropium polyphyllum | Heliotropium leavenworthii Torr. | HELE6 |
| Heliotropium polyphyllum | Heliotropium polyphyllum Lehm. var. horizontale (Small) R.W. Long | HEPOH |
| Heliotropium procumbens var. procumbens | Heliotropium inundatum Sw. | HEIN10 |
| Heliotropium racemosum | Heliotropium convolvulaceum (Nutt.) Gray var. racemosum (Rose & Standl.) I.M. Johnston | HECOR2 |
| Heliotropium ramosissimum | Heliotropium undulatum Vahl | HEUN4 |
| Heliotropium tenellum | Lithococca tenella (Nutt.) Small | LITE10 |
| Heliotropium torreyi | Heliotropium angustifolium Torr. | HEAN12 |
| Heller's marbleseed | Onosmodium helleri Small | ONHE |
| Hickman's popcornflower | Plagiobothrys chorisianus (Cham.) I.M. Johnston var. hickmanii (Greene) I.M. Johnston | PLCHH |
| hoary puccoon | Lithospermum canescens (Michx.) Lehm. | LICA12 |
| Hoffmann's cryptantha | Cryptantha hoffmannii I.M. Johnston | CRHO2 |
| Hoover's cryptantha | Cryptantha hooveri I.M. Johnston | CRHO4 |
| hound's tongue | Cynoglossum L. | CYNOG |
| Howard's alpine forget-me-not | Eritrichium howardii (Gray) Rydb. | ERHO8 |
| Ibapah tickweed | Hackelia ibapensis L.& J. Shultz | HAIB |
| Idaho bluebells | Mertensia campanulata A. Nels. | MECA6 |
| Indian heliotrope | Heliotropium indicum L. | HEIN |
| Italian bugloss | Anchusa azurea P. Mill. | ANAZ |
| Italian viper's bugloss | Echium italicum L. | ECIT |
| James's cryptantha | Cryptantha cinerea (Greene) Cronq. | CRCI3 |
| James's cryptantha | Cryptantha cinerea (Greene) Cronq. var. abortiva (Greene) Cronq. | CRCIA |
| James's cryptantha | Cryptantha cinerea (Greene) Cronq. var. arenicola Higgins & Welsh | CRCIA2 |
| James's cryptantha | Cryptantha cinerea (Greene) Cronq. var. cinerea | CRCIC |
| James's cryptantha | Cryptantha cinerea (Greene) Cronq. var. jamesii Cronq. | CRCIJ |
| James's cryptantha | Cryptantha cinerea (Greene) Cronq. var. laxa (J.F. Macbr.) Higgins | CRCIL |
| James's cryptantha | Cryptantha cinerea (Greene) Cronq. var. pustulosa (Rydb.) Higgins | CRCIP |
| Jessica sticktight | Hackelia micrantha (Eastw.) J.L. Gentry | HAMI |
| Johnston's cryptantha | Cryptantha johnstonii Higgins | CRJO |
| Jones's stickseed | Hackelia pinetorum (Greene ex Gray) I.M. Johnston var. jonesii J.L. Gentry | HAPIJ |
| Kelsey's cryptantha | Cryptantha kelseyana Greene | CRKE |
| Key West heliotrope | Heliotropium fruticosum L. | HEFR2 |
| knockaway | Ehretia anacua (Ter?n & Berl.) I.M. Johnston | EHAN |
| kou | Cordia subcordata Lam. | COSU2 |
| Lappula marginata | Lappula patula (Lehm.) Menyh. | LAPA12 |
| Lappula occidentalis var. cupulata | Lappula redowskii (Hornem.) Greene var. cupulata (Gray) M.E. Jones | LAREC |
| Lappula occidentalis var. cupulata | Lappula redowskii (Hornem.) Greene var. texana (Scheele) Brand | LARET |
| Lappula occidentalis var. cupulata | Lappula texana (Scheele) Britt. | LATE3 |
| Lappula occidentalis var. cupulata | Lappula texana (Scheele) Britt. var. coronata (Greene) A. Nels. & J.F. Macbr. | LATEC |
| Lappula occidentalis var. cupulata | Lappula texana (Scheele) Britt. var. heterosperma (Greene) A. Nels. & J.F. Macbr. | LATEH |
| Lappula occidentalis var. cupulata | Lappula texana (Scheele) Britt. var. homosperma (A. Nels.) A. Nels. & J.F. Macbr. | LATEH2 |
| Lappula occidentalis var. occidentalis | Lappula echinata Gilib. var. occidentalis (S. Wats.) Boivin | LAECO |
| Lappula occidentalis var. occidentalis | Lappula redowskii (Hornem.) Greene var. desertorum (Greene) I.M. Johnston | LARED |
| Lappula occidentalis var. occidentalis | Lappula redowskii (Hornem.) Greene var. occidentalis (S. Wats.) Rydb. | LAREO |
| Lappula occidentalis var. occidentalis | Lappula redowskii (Hornem.) Greene var. redowskii (Hornem.) Greene [superfluous autonym] | LARER |
| Lappula occidentalis var. occidentalis | Lappula redowskii auct. non (Hornem.) Greene [misapplied] | LARE |
| Lappula squarrosa | Lappula echinata Gilib. | LAEC |
| Lappula squarrosa | Lappula erecta A. Nels. | LAER4 |
| Lappula squarrosa | Lappula fremontii (Torr.) Greene | LAFR5 |
| Lappula squarrosa | Lappula lappula (L.) Karst. | LALA11 |
| Lappula squarrosa | Lappula myosotis Moench | LAMY3 |
| Lappula squarrosa | Lappula squarrosa (Retz.) Dumort. var. erecta (A. Nels.) Dorn | LASQE |
| largeflowered fiddleneck | Amsinckia grandiflora (Kleeb. ex Gray) Kleeb. ex Greene | AMGR3 |
| largeleaf brunnera | Brunnera macrophylla (J.F. Adams) I.M. Johnston | BRMA11 |
| largeleaf geigertree | Cordia sebestena L. | COSE2 |
| largeseed forget-me-not | Myosotis macrosperma Engelm. | MYMA |
| Las Vegas cryptantha | Cryptantha insolita (J.F. Macbr.) Payson | CRIN15 |
| laurel-leaf soldierbush | Tournefortia laurifolia Vent. | TOLA2 |
| leaf between flower | Bothriospermum tenellum (Hornem.) Fisch. & C.A. Mey. | BOTE4 |
| leafy heliotrope | Heliotropium confertifolium (Torr.) Torr. ex Gray | HECO4 |
| lesser showy stickseed | Hackelia venusta (Piper) St. John | HAVE4 |
| lija | Cordia lima (Desv.) Roemer & J.A. Schultes | COLI7 |
| lithospermum | Lithospermum erythrorhizon Siebold & Zucc. | LIER |
| Lithospermum canescens | Batschia canescens Michx. | BACA7 |
| Lithospermum caroliniense | Lithospermum gmelini (Michx) Hitchc. | LIGM |
| Lithospermum caroliniense var. caroliniense | Batschia caroliniensis Walt. ex J.F. Gmel. | BACA5 |
| Lithospermum caroliniense var. caroliniense | Lithospermum carolinianum Lam. | LICA27 |
| Lithospermum caroliniense var. croceum | Lithospermum caroliniense (Walt. ex J.F. Gmel.) MacM. ssp. croceum (Fern.) Cusick | LICAC7 |
| Lithospermum caroliniense var. croceum | Lithospermum croceum Fern. | LICR4 |
| Lithospermum incisum | Batschia linearifolia (Goldie) Small | BALI |
| Lithospermum incisum | Lithospermum angustifolium Michx. | LIAN6 |
| Lithospermum incisum | Lithospermum linearifolium Goldie | LILI8 |
| Lithospermum incisum | Lithospermum mandanense Spreng. | LIMA14 |
| Lithospermum ruderale | Lithospermum pilosum Nutt. | LIPI6 |
| little combseed | Pectocarya pusilla (A. DC.) Gray | PEPU |
| little cryptantha | Cryptantha minima Rydb. | CRMI5 |
| littleleaf heliotrope | Heliotropium microphyllum Sw. ex Wikstr. | HEMI10 |
| Livermore stickseed | Hackelia pinetorum (Greene ex Gray) I.M. Johnston | HAPI2 |
| Livermore stickseed | Hackelia pinetorum (Greene ex Gray) I.M. Johnston var. pinetorum | HAPIP |
| longflower cryptantha | Cryptantha longiflora (A. Nels.) Payson | CRLO6 |
| low cryptantha | Cryptantha pusilla (Torr. & Gray) Greene | CRPU7 |
| lungwort | Pulmonaria L. | PULMO |
| Luquillo Mountain manjack | Cordia wagneriorum Howard | COWA3 |
| Macdougal's bluebells | Mertensia macdougalii Heller | MEMA2 |
| Malheur cryptantha | Cryptantha propria (A. Nels. & J.F. Macbr.) Payson | CRPR3 |
| Malheur Valley fiddleneck | Amsinckia carinata A. Nels. & J.F. Macbr. | AMCA8 |
| manyflower stickseed | Hackelia floribunda (Lehm.) I.M. Johnston | HAFL2 |
| manyflowered stoneseed | Lithospermum multiflorum Torr. ex Gray | LIMU3 |
| marbleseed | Onosmodium Michx. | ONOSM |
| margined stickseed | Lappula marginata (Bieb.) Guerke | LAMA9 |
| Mariposa cryptantha | Cryptantha mariposae I.M. Johnston | CRMA6 |
| matted crinklemat | Tiquilia latior (I.M. Johnston) A. Richards. | TILA6 |
| Mayacamas popcornflower | Plagiobothrys lithocaryus (Greene ex Gray) I.M. Johnston | PLLI |
| Menzies's fiddleneck | Amsinckia menziesii (Lehm.) A. Nels. & J.F. Macbr. | AMME |
| Menzies's fiddleneck | Amsinckia menziesii (Lehm.) A. Nels. & J.F. Macbr. var. menziesii | AMMEM2 |
| Mertensia arizonica | Mertensia arizonica Greene var. grahamii L.O. Williams | MEARG3 |
| Mertensia arizonica | Mertensia arizonica Greene var. leonardii (Rydb.) I.M. Johnston | MEARL |
| Mertensia arizonica | Mertensia arizonica Greene var. subnuda (J.F. Macbr.) L.O. Williams | MEARS |
| Mertensia ciliata var. ciliata | Mertensia ciliata (James ex Torr.) G. Don var. latiloba L.O. Williams | MECIL |
| Mertensia ciliata var. ciliata | Mertensia ciliata (James ex Torr.) G. Don var. subpubescens (Rydb.) J.F. Macbr. & Payson | MECIS2 |
| Mertensia ciliata var. ciliata | Pulmonaria ciliata James ex Torr. | PUCI |
| Mertensia lanceolata var. coriacea | Mertensia viridis (A. Nels.) A. Nels. var. dilata (A. Nels.) L.O. Williams | MEVID2 |
| Mertensia lanceolata var. lanceolata | Mertensia linearis Greene | MELI9 |
| Mertensia maritima var. asiatica | Mertensia maritima (L.) S.F. Gray ssp. asiatica Takeda | MEMAA |
| Mertensia maritima var. maritima | Pneumaria maritima (L.) Hill | PNMA |
| Mertensia oblongifolia | Mertensia bakeri Greene | MEBA |
| Mertensia oblongifolia | Mertensia bakeri Greene var. osterhoutii L.O. Williams | MEBAO |
| Mertensia oblongifolia | Mertensia cusickii Piper | MECU |
| Mertensia oblongifolia | Mertensia fusiformis Greene | MEFU2 |
| Mertensia oblongifolia | Mertensia lanceolata (Pursh) DC. var. fendleri (Gray) Gray | MELAF |
| Mertensia oblongifolia | Mertensia lanceolata (Pursh) DC. var. nivalis (S. Wats.) Higgins | MELAN4 |
| Mertensia oblongifolia | Mertensia lanceolata (Pursh) DC. var. pubens (J.F. Macbr.) L.O. Williams | MELAP2 |
| Mertensia oblongifolia | Mertensia lanceolata (Pursh) DC. var. viridis A. Nels. | MELAV2 |
| Mertensia oblongifolia | Mertensia oblongifolia (Nutt.) G. Don var. amoena (A. Nels.) L.O. Williams | MEOBA |
| Mertensia oblongifolia | Mertensia oblongifolia (Nutt.) G. Don var. nevadensis (A. Nels.) L.O. Williams | MEOBN |
| Mertensia oblongifolia | Mertensia oblongifolia (Nutt.) G. Don var. oblongifolia (Nutt.) G. Don [superfluous autonym] | MEOBO2 |
| Mertensia oblongifolia | Mertensia oreophila L.O. Williams | MEOR5 |
| Mertensia oblongifolia | Mertensia paniculata (Ait.) G. Don var. nivalis S. Wats. | MEPAN |
| Mertensia oblongifolia | Mertensia perplexa Rydb. | MEPE5 |
| Mertensia oblongifolia | Mertensia toiyabensis J.F. Macbr. | METO5 |
| Mertensia oblongifolia | Mertensia viridis (A. Nels.) A. Nels. | MEVI4 |
| Mertensia oblongifolia | Mertensia viridis (A. Nels.) A. Nels. var. caelestina (A. Nels. & Cockerell) L.O. Williams | MEVIC2 |
| Mertensia oblongifolia | Mertensia viridis (A. Nels.) A. Nels. var. cana (Rydb.) L.O. Williams | MEVIC |
| Mertensia oblongifolia | Mertensia viridis (A. Nels.) A. Nels. var. cynoglossoides (Greene) J.F. Macbr. | MEVIC3 |
| Mertensia oblongifolia | Mertensia viridis (A. Nels.) A. Nels. var. parvifolia L.O. Williams | MEVIP |
| Mertensia paniculata var. alaskana | Mertensia alaskana Britt. | MEAL9 |
| Mertensia paniculata var. eastwoodiae | Mertensia eastwoodiae J.F. Macbr. | MEEA |
| Mertensia paniculata var. eastwoodiae | Mertensia paniculata (Ait.) G. Don ssp. eastwoodiae (J.F. Macbr.) Welsh | MEPAE2 |
| Mertensia paniculata var. paniculata | Mertensia palmeri A. Nels. & J.F. Macbr. | MEPA8 |
| Mertensia paniculata var. paniculata | Mertensia pilosa (Cham.) DC. | MEPI4 |
| Mertensia platyphylla var. subcordata | Mertensia paniculata (Ait.) G. Don var. subcordata (Greene) J.F. Macbr. | MEPAS |
| Mesa Verde stickseed | Hackelia gracilenta (Eastw.) I.M. Johnston | HAGR10 |
| Mexican crinklemat | Tiquilia mexicana (S. Wats.) A. Richards. | TIME |
| Mexican cryptantha | Cryptantha mexicana (Brandeg.) I.M. Johnston | CRME4 |
| Mexican navelwort | Omphalodes aliena Gray | OMAL |
| Mexican saucerflower | Antiphytum heliotropioides A. DC. | ANHE4 |
| Milo Baker's cryptantha | Cryptantha milo-bakeri I.M. Johnston | CRMI4 |
| miner's candle | Cryptantha virgata (Porter) Payson | CRVI4 |
| Mojave cryptantha | Cryptantha mohavensis (Greene) Greene | CRMO7 |
| Mojave popcornflower | Plagiobothrys jonesii Gray | PLJO |
| monkswort | Nonea Medik. | NONEA |
| moth combseed | Pectocarya setosa Gray | PESE |
| mountain cryptantha | Cryptantha cana (A. Nels.) Payson | CRCA8 |
| mucilage manjack | Cordia sulcata DC. | COSU3 |
| muneco | Cordia borinquensis Urban | COBO3 |
| Myosotis arvensis | Myosotis scorpioides L. var. arvensis L. | MYSCA |
| Myosotis asiatica | Myosotis alpestris auct. non F.W. Schmidt [misapplied] | MYAL |
| Myosotis asiatica | Myosotis alpestris F.W. Schmidt ssp. asiatica Vesterg. | MYALA2 |
| Myosotis asiatica | Myosotis sylvatica Ehrh. ex Hoffmann var. alpestris auct. non (F.W. Schmidt) Koch [misapplied] | MYSYA |
| Myosotis discolor | Myosotis versicolor (Pers.) Sm. | MYVE5 |
| Myosotis macrosperma | Myosotis verna Nutt. var. macrosperma (Engelm.) Chapman | MYVEM |
| Myosotis macrosperma | Myosotis virginica (L.) B.S.P. var. macrosperma (Engelm.) Fern. | MYVIM |
| Myosotis scorpioides | Myosotis palustris (L.) Hill | MYPA2 |
| Myosotis stricta | Myosotis micrantha auct. non Pallas ex Lehm. [misapplied] | MYMI |
| Myosotis verna | Myosotis virginica auct. non (L.) B.S.P. [misapplied] | MYVI2 |
| Napa cryptantha | Cryptantha hispidula Greene ex Brand | CRHI |
| narrowleaf stoneseed | Lithospermum incisum Lehm. | LIIN2 |
| narrowstem cryptantha | Cryptantha gracilis Osterhout | CRGR3 |
| navelwort | Omphalodes P. Mill. | OMPHA |
| netted popcornflower | Plagiobothrys reticulatus (Piper) I.M. Johnston | PLRE |
| Nevada cryptantha | Cryptantha nevadensis A. Nels. & Kennedy | CRNE2 |
| Nevada cryptantha | Cryptantha nevadensis A. Nels. & Kennedy var. nevadensis | CRNEN |
| Nevada cryptantha | Cryptantha nevadensis A. Nels. & Kennedy var. rigida I.M. Johnston | CRNER |
| New Mexico cryptantha | Cryptantha albida (Kunth) I.M. Johnston | CRAL |
| New Mexico stickseed | Hackelia hirsuta (Woot. & Standl.) I.M. Johnston | HAHI2 |
| New York Mountain cryptantha | Cryptantha tumulosa (Payson) Payson | CRTU |
| niguita | Tournefortia bicolor Sw. | TOBI |
| nodding stickseed | Hackelia deflexa (Wahlenb.) Opiz | HADE |
| northern bluebells | Mertensia paniculata (Ait.) G. Don var. borealis (J.F. Macbr.) L.O. Williams | MEPAB |
| Nuttall's crinklemat | Tiquilia nuttallii (Hook.) A. Richards. | TINU2 |
| oblongleaf bluebells | Mertensia oblongifolia (Nutt.) G. Don | MEOB |
| oilshale cryptantha | Cryptantha barnebyi I.M. Johnston | CRBA6 |
| Okanogan stickseed | Hackelia ciliata (Dougl. ex Lehm.) I.M. Johnston | HACI4 |
| Omphalodes linifolia | Cynoglossum linifolium L. | CYLI12 |
| onosma | Onosma echioides L. | ONEC |
| onosma | Onosma L. | ONOSM2 |
| Onosmodium bejariense var. bejariense | Onosmodium molle Michx. | ONMO |
| Onosmodium bejariense var. bejariense | Onosmodium molle Michx. ssp. bejariense (DC. ex A. DC.) Cochrane | ONMOB3 |
| Onosmodium bejariense var. bejariense | Onosmodium molle Michx. ssp. molle Michx. [superfluous autonym] | ONMOM |
| Onosmodium bejariense var. bejariense | Onosmodium molle Michx. var. bejariense (DC. ex A. DC.) Cronq. | ONMOB2 |
| Onosmodium bejariense var. hispidissimum | Lithospermum carolinianum auct. non Lam. [misapplied] | LICA29 |
| Onosmodium bejariense var. hispidissimum | Onosmodium hispidissimum Mackenzie | ONHI |
| Onosmodium bejariense var. hispidissimum | Onosmodium hispidissimum Mackenzie var. macrospermum Mackenzie & Bush | ONHIM |
| Onosmodium bejariense var. hispidissimum | Onosmodium molle Michx. ssp. hispidissimum (Mackenzie) Boivin | ONMOH2 |
| Onosmodium bejariense var. hispidissimum | Onosmodium molle Michx. var. hispidissimum (Mackenzie) Cronq. | ONMOH |
| Onosmodium bejariense var. occidentale | Onosmodium molle Michx. ssp. occidentale (Mackenzie) Cochrane | ONMOO2 |
| Onosmodium bejariense var. occidentale | Onosmodium molle Michx. var. occidentale (Mackenzie) I.M. Johnston | ONMOO |
| Onosmodium bejariense var. occidentale | Onosmodium occidentale Mackenzie | ONOC |
| Onosmodium bejariense var. occidentale | Onosmodium occidentale Mackenzie var. sylvestre Mackenzie | ONOCS |
| Onosmodium bejariense var. subsetosum | Onosmodium molle Michx. ssp. subsetosum (Mackenzie & Bush) Cochrane | ONMOS |
| Onosmodium bejariense var. subsetosum | Onosmodium molle Michx. var. subsetosum (Mackenzie & Bush) Cronq. | ONMOS2 |
| Onosmodium bejariense var. subsetosum | Onosmodium subsetosum Mackenzie & Bush | ONSU |
| Onosmodium virginianum | Onosmodium virginianum (L.) A. DC. var. hirsutum Mackenzie | ONVIH |
| Oriental popcornflower | Plagiobothrys orientalis (L.) I.M. Johnston | PLOR |
| Osterhout's cryptantha | Cryptantha osterhoutii (Payson) Payson | CROS |
| Owyhee River stickseed | Hackelia ophiobia R.L. Carr | HAOP2 |
| oysterleaf | Mertensia maritima (L.) S.F. Gray | MEMA3 |
| oysterleaf | Mertensia maritima (L.) S.F. Gray var. asiatica (Takeda) Welsh | MEMAA2 |
| oysterleaf | Mertensia maritima (L.) S.F. Gray var. maritima | MEMAM |
| Pacific hound's tongue | Cynoglossum grande Dougl. ex Lehm. | CYGR |
| Pacific popcornflower | Plagiobothrys tenellus (Nutt. ex Hook.) Gray | PLTE |
| Palmer's crinklemat | Tiquilia palmeri (Gray) A. Richards. | TIPA |
| Palmer's cryptantha | Cryptantha palmeri (Gray) Payson | CRPA21 |
| Palmer's grapplinghook | Harpagonella palmeri Gray | HAPA7 |
| Palmer's grapplinghook | Harpagonella palmeri Gray var. palmeri | HAPAP2 |
| Panamint cryptantha | Cryptantha angustifolia (Torr.) Greene | CRAN4 |
| Parish's popcornflower | Plagiobothrys parishii I.M. Johnston | PLPA |
| Parks's stoneseed | Lithospermum parksii I.M. Johnston | LIPA6 |
| Parks's stoneseed | Lithospermum parksii I.M. Johnston var. parksii | LIPAP |
| Parks's stoneseed | Lithospermum parksii I.M. Johnston var. rugulosum I.M. Johnston | LIPAR2 |
| pasture heliotrope | Heliotropium tenellum (Nutt.) Torr. | HETE3 |
| Payson's cryptantha | Cryptantha paysonii (J.F. Macbr.) I.M. Johnston | CRPA8 |
| Pectocarya heterocarpa | Pectocarya penicillata (Hook. & Arn.) A. DC. var. heterocarpa I.M. Johnston | PEPEH |
| Pectocarya linearis ssp. ferocula | Pectocarya linearis (Ruiz & Pav?n) DC. var. ferocula I.M. Johnston | PELIF |
| Pectocarya penicillata | Cynoglossum penicillatum Hook. & Arn. | CYPE8 |
| Pectocarya penicillata | Pectocarya linearis (Ruiz & Pav?n) DC. var. penicillata (Hook. & Arn.) M.E. Jones | PELIP2 |
| Pectocarya platycarpa | Pectocarya gracilis I.M. Johnston var. platycarpa Munz & Johnston | PEGRP |
| Pectocarya platycarpa | Pectocarya linearis (Ruiz & Pav?n) DC. var. platycarpa (Munz & Johnston) Cronq. | PELIP3 |
| peninsular pectocarya | Pectocarya peninsularis I.M. Johnston | PEPE33 |
| pentaglottis | Pentaglottis Tausch | PENTA2 |
| Pentaglottis sempervirens | Anchusa sempervirens L. | ANSE12 |
| Pentaglottis sempervirens | Caryolophora sempervirens (L.) Fisch. & Trautv. | CASE19 |
| phlox heliotrope | Heliotropium convolvulaceum (Nutt.) Gray | HECO5 |
| phlox heliotrope | Heliotropium convolvulaceum (Nutt.) Gray var. californicum (Greene) I.M. Johnston | HECOC |
| phlox heliotrope | Heliotropium convolvulaceum (Nutt.) Gray var. convolvulaceum | HECOC7 |
| pick me nots | Cryptantha texana (A. DC.) Greene | CRTE5 |
| pine echium | Echium pininana Webb & Berthel. | ECPI2 |
| pineland heliotrope | Heliotropium polyphyllum Lehm. | HEPO |
| pinewoods cryptantha | Cryptantha simulans Greene | CRSI2 |
| pink stickseed | Hackelia mundula (Jepson) Ferris | HAMU |
| Pinyon Desert cryptantha | Cryptantha scoparia A. Nels. | CRSC2 |
| Plagiobothrys acanthocarpus | Allocarya acanthocarpa Piper | ALAC5 |
| Plagiobothrys austiniae | Allocarya austiniae Greene | ALAU3 |
| Plagiobothrys bracteatus var. bracteatus | Allocarya bracteata T.J. Howell | ALBR11 |
| Plagiobothrys canescens var. catalinensis | Plagiobothrys arizonicus (Gray) Greene ex Gray var. catalinensis Gray | PLARC |
| Plagiobothrys chorisianus var. chorisianus | Allocarya chorisiana (Cham.) Greene | ALCH3 |
| Plagiobothrys chorisianus var. hickmanii | Allocarya chorisiana (Cham.) Greene var. hickmanii (Greene) Jepson | ALCHH |
| Plagiobothrys chorisianus var. undulatus | Allocarya undulata Piper | ALUN2 |
| Plagiobothrys chorisianus var. undulatus | Plagiobothrys undulatus (Piper) I.M. Johnston | PLUN2 |
| Plagiobothrys collinus var. californicus | Allocarya californica (Fisch. & C.A. Mey.) Greene var. minuta (Piper) Jepson & Hoover | ALCAM3 |
| Plagiobothrys collinus var. californicus | Allocarya cooperi Greene | ALCO9 |
| Plagiobothrys collinus var. californicus | Echidiocarya californica Gray | ECCA |
| Plagiobothrys collinus var. californicus | Plagiobothrys californicus (Gray) Greene | PLCA |
| Plagiobothrys collinus var. fulvescens | Echidiocarya californica Gray ssp. fulvescens (I.M. Johnston) Abrams | ECCAF |
| Plagiobothrys collinus var. fulvescens | Plagiobothrys californicus (Gray) Greene var. fulvescens I.M. Johnston | PLCAF |
| Plagiobothrys collinus var. gracilis | Echidiocarya californica Gray ssp. gracilis (I.M. Johnston) Abrams | ECCAG |
| Plagiobothrys collinus var. gracilis | Plagiobothrys californicus (Gray) Greene var. gracilis I.M. Johnston | PLCAG |
| Plagiobothrys collinus var. ursinus | Echidiocarya californica Gray var. ursina (Gray) Jepson | ECCAU |
| Plagiobothrys collinus var. ursinus | Plagiobothrys californicus (Gray) Greene var. ursinus (Gray) I.M. Johnston | PLCAU |
| Plagiobothrys figuratus ssp. corallicarpus | Allocarya hirta Greene ssp. corallicarpa (Piper) Abrams | ALHIC |
| Plagiobothrys figuratus ssp. corallicarpus | Plagiobothrys hirtus (Greene) I.M. Johnston var. corallicarpus (Piper) I.M. Johnston | PLHIC |
| Plagiobothrys figuratus ssp. figuratus | Allocarya figurata Piper | ALFI7 |
| Plagiobothrys figuratus ssp. figuratus | Plagiobothrys hirtus (Greene) I.M. Johnston var. figuratus (Piper) I.M. Johnston | PLHIF |
| Plagiobothrys fulvus var. campestris | Plagiobothrys campestris Greene | PLCA13 |
| Plagiobothrys glaber | Allocarya glaber (Gray) J.F. Macbr. | ALGL12 |
| Plagiobothrys glyptocarpus var. glyptocarpus | Allocarya glyptocarpa Piper | ALGL13 |
| Plagiobothrys glyptocarpus var. modestus | Allocarya glyptocarpa Piper ssp. modesta (I.M. Johnston) Abrams | ALGLM |
| Plagiobothrys greenei | Allocarya greenei (Gray) Greene | ALGR3 |
| Plagiobothrys hirtus | Allocarya hirta Greene | ALHI4 |
| Plagiobothrys humistratus | Allocarya humistrata Greene | ALHU4 |
| Plagiobothrys hystriculus | Allocarya hystricula Piper | ALHY2 |
| Plagiobothrys kingii var. harknessii | Plagiobothrys harknessii Greene | PLHA |
| Plagiobothrys lamprocarpus | Allocarya lamprocarpa Piper | ALLA7 |
| Plagiobothrys leptocladus | Allocarya leptoclada Greene | ALLE4 |
| Plagiobothrys leptocladus | Plagiobothrys orthocarpus (Greene) I.M. Johnston | PLOR5 |
| Plagiobothrys lithocaryus | Allocarya lithocarya Greene ex Gray | ALLI |
| Plagiobothrys mollis var. mollis | Allocarya mollis (Gray) Greene | ALMO5 |
| Plagiobothrys mollis var. vestitus | Allocarya mollis (Gray) Greene var. vestita (Greene) Jepson | ALMOV |
| Plagiobothrys reticulatus | Plagiobothrys reticulatus (Piper) I. M. Johnst. var. reticulatus (Piper) I. M. Johnst. [superfluous autonym] | PLRER3 |
| Plagiobothrys salsus | Allocarya salsa Brandeg. | ALSA7 |
| Plagiobothrys scouleri var. cusickii | Allocarya cusickii Greene | ALCU2 |
| Plagiobothrys scouleri var. cusickii | Plagiobothrys cusickii (Greene) I.M. Johnston | PLCU2 |
| Plagiobothrys scouleri var. hispidulus | Allocarya cognata Greene | ALCO10 |
| Plagiobothrys scouleri var. hispidulus | Allocarya hispidula Greene | ALHI5 |
| Plagiobothrys scouleri var. hispidulus | Allocarya scopulorum Greene | ALSC7 |
| Plagiobothrys scouleri var. hispidulus | Plagiobothrys cognatus (Greene) I.M. Johnston | PLCO10 |
| Plagiobothrys scouleri var. hispidulus | Plagiobothrys hispidulus (Greene) I.M. Johnston | PLHI7 |
| Plagiobothrys scouleri var. hispidulus | Plagiobothrys nelsonii (Greene) I.M. Johnston | PLNE2 |
| Plagiobothrys scouleri var. hispidulus | Plagiobothrys scopulorum (Greene) I.M. Johnston | PLSC |
| Plagiobothrys scouleri var. hispidulus | Plagiobothrys scouleri (Hook. & Arn.) I.M. Johnston ssp. penicillatus (Greene) A. L?ve | PLSCP2 |
| Plagiobothrys scouleri var. hispidulus | Plagiobothrys scouleri (Hook. & Arn.) I.M. Johnston var. penicillatus (Greene) Cronq. | PLSCP |
| Plagiobothrys scouleri var. scouleri | Allocarya californica (Fisch. & C.A. Mey.) Greene | ALCA10 |
| Plagiobothrys scouleri var. scouleri | Allocarya granulata Piper | ALGR4 |
| Plagiobothrys scouleri var. scouleri | Allocarya scouleri (Hook. & Arn.) Greene | ALSC9 |
| Plagiobothrys scouleri var. scouleri | Plagiobothrys granulatus (Piper) I.M. Johnston | PLGR3 |
| Plagiobothrys scouleri var. scouleri | Plagiobothrys reticulatus (Piper) I.M. Johnston var. rossianorum I.M. Johnston | PLRER |
| Plagiobothrys scriptus | Allocarya scripta Greene | ALSC8 |
| Plagiobothrys stipitatus var. micranthus | Allocarya stipitata Greene ssp. micrantha Piper | ALSTM |
| Plagiobothrys stipitatus var. stipitatus | Allocarya stipitata Greene | ALST6 |
| Plagiobothrys strictus | Allocarya stricta Greene | ALST7 |
| Plagiobothrys tenellus | Plagiobothrys asper Greene | PLAS |
| Plagiobothrys tener var. tener | Allocarya tener Greene | ALTE5 |
| Plagiobothrys tener var. tener | Plagiobothrys tener (Greene) I.M. Johnston var. fallax I.M. Johnston | PLTEF |
| Plagiobothrys torreyi var. diffusus | Allocarya diffusa Greene | ALDI6 |
| Plagiobothrys torreyi var. diffusus | Plagiobothrys diffusus (Greene) I.M. Johnston | PLDI |
| Plagiobothrys trachycarpus | Allocarya trachycarpa (Gray) Greene | ALTR9 |
| plumed crinklemat | Tiquilia greggii (Torr. & Gray) A. Richards. | TIGR |
| pointed cryptantha | Cryptantha muricata (Hook. & Arn.) A. Nels. & J.F. Macbr. | CRMU2 |
| Poison Canyon stickseed | Hackelia brevicula (Jepson) J.L. Gentry | HABR4 |
| Polynesian heliotrope | Heliotropium anomalum Hook. & Arn. | HEAN8 |
| Polynesian heliotrope | Heliotropium anomalum Hook. & Arn. var. argenteum Gray | HEANA |
| Polynesian heliotrope | Heliotropium anomalum Hool. & Arn. anomalum var. anomalum Hool. & Arn. anomalum [excluded] | HEANA3 |
| popcornflower | Plagiobothrys Fisch. & C.A. Mey. | PLAGI |
| prairie bluebells | Mertensia lanceolata (Pursh) DC. | MELA3 |
| prairie bluebells | Mertensia lanceolata (Pursh) DC. var. brachyloba (Greene) A. Nels. | MELAB |
| prairie bluebells | Mertensia lanceolata (Pursh) DC. var. coriacea (A. Nels.) Higgins & Welsh | MELAC |
| prairie bluebells | Mertensia lanceolata (Pursh) DC. var. lanceolata | MELAL2 |
| prairie bluebells | Mertensia lanceolata (Pursh) DC. var. secundorum Cockerell | MELAS2 |
| prickly comfrey | Symphytum asperum Lepechin | SYAS |
| prickly cryptantha | Cryptantha echinella Greene | CREC |
| prickly hound's tongue | Cynoglossum glochidiatum Wallich ex Benth. | CYGL8 |
| pride of Madeira | Echium candicans L. f. | ECCA5 |
| Pringle's heliotrope | Heliotropium pringlei B.L. Robins. | HEPR9 |
| Pringle's popcornflower | Plagiobothrys pringlei Greene | PLPR3 |
| Puerto Rico manjack | Cordia rupicola Urban | CORU5 |
| pygmyflower cryptantha | Cryptantha micromeres (Gray) Greene | CRMI2 |
| quill cryptantha | Cryptantha affinis (Gray) Greene | CRAF |
| Rattan's cryptantha | Cryptantha rattanii Greene | CRRA3 |
| red manjack | Cordia collococca L. | COCO5 |
| red monkswort | Nonea vesicaria (L.) Reichenb. | NOVE |
| redroot cryptantha | Cryptantha micrantha (Torr.) I.M. Johnston | CRMI |
| redroot cryptantha | Cryptantha micrantha (Torr.) I.M. Johnston var. lepida (Gray) I.M. Johnston | CRMIL2 |
| redroot cryptantha | Cryptantha micrantha (Torr.) I.M. Johnston var. micrantha | CRMIM |
| ribbed cryptantha | Cryptantha costata Brandeg. | CRCO15 |
| roble de guayo | Bourreria virgata (Sw.) G. Don | BOVI2 |
| rochefortia | Rochefortia Sw. | ROCHE |
| Rochefortia spinosa | Rochefortia cuneata Sw. | ROCU3 |
| Rocky Mountain bluebells | Mertensia humilis Rydb. | MEHU2 |
| Rocky Mountain whitethroat | Dasynotus daubenmirei I.M. Johnston | DADA |
| Rollins's cryptantha | Cryptantha rollinsii I.M. Johnston | CRRO6 |
| rose monkswort | Nonea rosea (Bieb.) Link | NORO |
| rough cryptantha | Cryptantha oblata (M.E. Jones) Payson | CROB |
| rough popcornflower | Plagiobothrys hirtus (Greene) I.M. Johnston | PLHI6 |
| rough stickseed | Hackelia hispida (Gray) I.M. Johnston var. disjuncta R.L. Carr | HAHID |
| rough stoneseed | Lithospermum matamorense DC. | LIMA5 |
| rough strongbark | Bourreria radula (Poir.) G. Don | BORA2 |
| roughfruit popcornflower | Plagiobothrys trachycarpus (Gray) I.M. Johnston | PLTR |
| roughseed cryptantha | Cryptantha flavoculata (A. Nels.) Payson | CRFL6 |
| roundleaf stoneseed | Lithospermum obtusifolium I.M. Johnston | LIOB5 |
| roundspike cryptantha | Cryptantha humilis (Gray) Payson | CRHU2 |
| rusty popcornflower | Plagiobothrys nothofulvus (Gray) Gray | PLNO |
| Sacramento cryptantha | Cryptantha crinita Greene | CRCR4 |
| sagebrush combseed | Pectocarya linearis (Ruiz & Pav?n) DC. | PELI |
| sagebrush combseed | Pectocarya linearis (Ruiz & Pav?n) DC. ssp. ferocula (I.M. Johnston) Thorne | PELIF2 |
| sagebrush stickseed | Hackelia diffusa (Lehm.) I.M. Johnston var. arida (Piper) R.L. Carr | HADIA |
| Salinas Valley popcornflower | Plagiobothrys uncinatus J.T. Howell | PLUN |
| Salmon River cryptantha | Cryptantha salmonensis (A. Nels. & J.F. Macbr.) Payson | CRSA6 |
| salt heliotrope | Heliotropium curassavicum L. | HECU3 |
| salt heliotrope | Heliotropium curassavicum L. var. curassavicum | HECUC2 |
| salty popcornflower | Plagiobothrys salsus (Brandeg.) I.M. Johnston | PLSA3 |
| salvation jane | Echium plantagineum L. | ECPL |
| San Antonio stoneseed | Lithospermum mirabile Small | LIMI3 |
| San Bartolome | Cordia rickseckeri Millsp. | CORI |
| San Rafael cryptantha | Cryptantha jonesiana (Payson) Payson | CRJO2 |
| sanddune cryptantha | Cryptantha fendleri (Gray) Greene | CRFE3 |
| saucerflower | Antiphytum DC. & Meisn. | ANTIP |
| scented cryptantha | Cryptantha utahensis (Gray) Greene | CRUT |
| scorpion's-tail | Heliotropium angiospermum Murr. | HEAN5 |
| scorpionbush | Carmona Cav. | CARMO |
| scorpionbush | Carmona retusa (Vahl) Masamune | CARE22 |
| Scouler's popcornflower | Plagiobothrys scouleri (Hook. & Arn.) I.M. Johnston | PLSC2 |
| Scouler's popcornflower | Plagiobothrys scouleri (Hook. & Arn.) I.M. Johnston var. scouleri | PLSCS |
| scribe popcornflower | Plagiobothrys scriptus (Greene) I.M. Johnston | PLSC3 |
| sculptured popcornflower | Plagiobothrys glyptocarpus (Piper) I.M. Johnston | PLGL2 |
| sculptured popcornflower | Plagiobothrys glyptocarpus (Piper) I.M. Johnston var. glyptocarpus | PLGLG |
| sculptured popcornflower | Plagiobothrys glyptocarpus (Piper) I.M. Johnston var. modestus I.M. Johnston | PLGLM |
| sea rosemary | Argusia Boehmer | ARGUS |
| sea rosemary | Argusia gnaphalodes (L.) Heine | ARGN2 |
| seaside heliotrope | Heliotropium curassavicum L. var. obovatum DC. | HECUO2 |
| seaside heliotrope | Heliotropium curassavicum L. var. oculatum (Heller) I.M. Johnston | HECUO |
| serpentine manjack | Cordia bellonis Urban | COBE3 |
| Shacklette's cryptantha | Cryptantha shackletteana Higgins | CRSH6 |
| shade bluebells | Mertensia umbratilis Greenm. | MEUM2 |
| sharpnut cryptantha | Cryptantha oxygona (Gray) Greene | CROX |
| Sharsmith's stickseed | Hackelia sharsmithii I.M. Johnston | HASH |
| Shasta popcornflower | Plagiobothrys shastensis Greene ex Gray | PLSH |
| shinyfruit popcornflower | Plagiobothrys lamprocarpus (Piper) I.M. Johnston | PLLA3 |
| shortstyle bluebells | Mertensia brevistyla S. Wats. | MEBR |
| showy alpine forget-me-not | Eritrichium splendens Kearney | ERSP9 |
| showy stickseed | Hackelia hispida (Gray) I.M. Johnston | HAHI3 |
| showy stickseed | Hackelia hispida (Gray) I.M. Johnston var. hispida | HAHIH |
| Siberian sea rosemary | Argusia sibirica (L.) Dandy | ARSI5 |
| Sierra cryptantha | Cryptantha nubigena (Greene) Payson | CRNU2 |
| Sierra stickseed | Hackelia nervosa (Kellogg) I.M. Johnston | HANE |
| silky cryptantha | Cryptantha sericea (Gray) Payson | CRSE3 |
| sleeping combseed | Pectocarya penicillata (Hook. & Arn.) A. DC. | PEPE26 |
| sleeping popcornflower | Plagiobothrys scouleri (Hook. & Arn.) I.M. Johnston var. hispidulus (Greene) Dorn | PLSCH |
| slender cryptantha | Cryptantha sparsiflora (Greene) Greene | CRSP3 |
| slender popcornflower | Plagiobothrys tener (Greene) I.M. Johnston | PLTE2 |
| slender popcornflower | Plagiobothrys tener (Greene) I.M. Johnston var. subglaber I.M. Johnston | PLTES |
| slender popcornflower | Plagiobothrys tener (Greene) I.M. Johnston var. tener | PLTET |
| slimleaf heliotrope | Heliotropium torreyi I.M. Johnston | HETO |
| small bluebells | Mertensia longiflora Greene | MELO4 |
| small bugloss | Anchusa arvensis (L.) Bieb. | ANAR16 |
| small-leaf geigertree | Cordia parvifolia A. DC. | COPA16 |
| smallbristle hound's tongue | Cynoglossum microglochin Benth. | CYMI3 |
| smallstamen viper's bugloss | Echium coincyanum Lacaita [excluded] | ECCO10 |
| smooth cryptantha | Cryptantha semiglabra Barneby | CRSE4 |
| smooth manjack | Cordia laevigata Lam. | COLA12 |
| smooth strongbark | Bourreria cassinifolia (A. Rich.) Griseb. | BOCA4 |
| smooththroat stoneseed | Lithospermum cobrense Greene | LICO7 |
| Snake River cryptantha | Cryptantha spiculifera (Piper) Payson | CRSP4 |
| soft heliotrope | Heliotropium molle (Torr.) I.M. Johnston | HEMO4 |
| soft popcornflower | Plagiobothrys mollis (Gray) I.M. Johnston | PLMO |
| soft popcornflower | Plagiobothrys mollis (Gray) I.M. Johnston var. mollis | PLMOM |
| soft popcornflower | Plagiobothrys mollis (Gray) I.M. Johnston var. vestitus (Greene) I.M. Johnston | PLMOV |
| soft-hair marbleseed | Onosmodium bejariense DC. ex A. DC. | ONBE |
| soft-hair marbleseed | Onosmodium bejariense DC. ex A. DC. var. bejariense | ONBEB |
| softhair marbleseed | Onosmodium bejariense DC. ex A. DC. var. hispidissimum (Mackenzie) B.L. Turner | ONBEH |
| softhair marbleseed | Onosmodium bejariense DC. ex A. DC. var. subsetosum (Mackenzie & Bush) B.L. Turner | ONBES |
| soldierbush | Tournefortia L. | TOURN |
| southwestern cryptantha | Cryptantha mensana (M.E. Jones) Payson | CRME5 |
| Spanish elm | Cordia alliodora (Ruiz & Pav?n) Oken | COAL |
| spotted stickseed | Hackelia patens (Nutt.) I.M. Johnston | HAPA |
| spotted stickseed | Hackelia patens (Nutt.) I.M. Johnston var. patens | HAPAP |
| spreading stickseed | Hackelia diffusa (Lehm.) I.M. Johnston | HADI2 |
| spreading stickseed | Hackelia diffusa (Lehm.) I.M. Johnston var. diffusa | HADID |
| spring forget-me-not | Myosotis verna Nutt. | MYVE |
| stalked popcornflower | Plagiobothrys stipitatus (Greene) I.M. Johnston | PLST |
| stalked popcornflower | Plagiobothrys stipitatus (Greene) I.M. Johnston var. micranthus (Piper) I.M. Johnston | PLSTM |
| stalked popcornflower | Plagiobothrys stipitatus (Greene) I.M. Johnston var. stipitatus | PLSTS |
| stickseed | Hackelia Opiz | HACKE |
| stickseed | Lappula Moench | LAPPU |
| stoneseed | Lithospermum L. | LITHO3 |
| strict forget-me-not | Myosotis stricta Link ex Roemer & J.A. Schultes | MYST2 |
| strongbark | Bourreria P. Br. | BOURR |
| subalpine cryptantha | Cryptantha crymophila I.M. Johnston | CRCR5 |
| Symphytum ?uplandicum | Symphytum peregrinum auct. non Ledeb. [misapplied] | SYPE3 |
| Symphytum asperum | Symphytum asperrimum Donn ex Sims | SYAS2 |
| Symphytum officinale | Symphytum officinale L. ssp. uliginosum auct. non (Kern.) Nyman [misapplied] | SYOFU |
| Symphytum officinale | Symphytum uliginosum auct. non Kern. [misapplied] | SYUL |
| tall bluebells | Mertensia paniculata (Ait.) G. Don | MEPA |
| tall bluebells | Mertensia paniculata (Ait.) G. Don var. paniculata | MEPAP |
| tall fringed bluebells | Mertensia ciliata (James ex Torr.) G. Don | MECI3 |
| tall fringed bluebells | Mertensia ciliata (James ex Torr.) G. Don var. ciliata | MECIC2 |
| tall fringed bluebells | Mertensia ciliata (James ex Torr.) G. Don var. stomatechoides (Kellogg) Jepson | MECIS |
| tarweed fiddleneck | Amsinckia lycopsoides Lehm. | AMLY |
| tawny cryptantha | Cryptantha fulvocanescens (S. Wats.) Payson | CRFU |
| tawny cryptantha | Cryptantha fulvocanescens (S. Wats.) Payson var. fulvocanescens | CRFUF |
| tawny cryptantha | Cryptantha fulvocanescens (S. Wats.) Payson var. nitida (Greene) R.C. Sivinski | CRFUN |
| Tejon cryptantha | Cryptantha microstachys (Greene ex Gray) Greene | CRMI3 |
| Terlingua Creek cryptantha | Cryptantha crassipes I.M. Johnston | CRCR7 |
| Texas crinklemat | Tiquilia gossypina (Woot. & Standl.) A. Richards. | TIGO |
| Texas heliotrope | Heliotropium texanum I.M. Johnston | HETE4 |
| Texas manjack | Cordia podocephala Torr. | COPO2 |
| Texas saucerflower | Antiphytum floribundum (Torr.) Gray | ANFL3 |
| thicksepal cryptantha | Cryptantha crassisepala (Torr. & Gray) Greene | CRCR3 |
| thicksepal cryptantha | Cryptantha crassisepala (Torr. & Gray) Greene var. crassisepala | CRCRC |
| thicksepal cryptantha | Cryptantha crassisepala (Torr. & Gray) Greene var. elachantha I.M. Johnston | CRCRE |
| Thompson's cryptantha | Cryptantha thompsonii I.M. Johnston | CRTH3 |
| Thurber's giant-trumpets | Macromeria viridiflora DC. var. thurberi (Gray) I.M. Johnston | MAVIT |
| Tiquilia canescens var. canescens | Coldenia canescens DC. | COCA2 |
| Tiquilia canescens var. canescens | Coldenia canescens DC. var. subnuda I.M. Johnston | COCAS |
| Tiquilia canescens var. pulchella | Coldenia canescens DC. var. pulchella I.M. Johnston | COCAP |
| Tiquilia gossypina | Coldenia gossypina (Woot. & Standl.) I.M. Johnston | COGO |
| Tiquilia gossypina | Eddya gossypina Woot. & Standl. | EDGO |
| Tiquilia greggii | Coldenia greggii (Torr. & Gray) Gray | COGR |
| Tiquilia greggii | Ptilocalyx greggii Torr. & Gray | PTGR2 |
| Tiquilia hispidissima | Coldenia hispidissima (Torr. & Gray) Gray | COHI |
| Tiquilia hispidissima | Eddya hispidissima Torr. & Gray | EDHI |
| Tiquilia latior | Coldenia hispidissima (Torr. & Gray) Gray var. latior I.M. Johnston | COHIL |
| Tiquilia mexicana | Coldenia mexicana S. Wats. | COME |
| Tiquilia mexicana | Coldenia mexicana S. Wats. var. tomentosa (S. Wats.) I.M. Johnston | COMET |
| Tiquilia nuttallii | Coldenia nuttallii Hook. | CONU2 |
| Tiquilia palmeri | Coldenia palmeri Gray | COPA |
| Tiquilia palmeri | Tiquiliopsis palmeri (Gray) Rydb. | TIPA3 |
| Tiquilia plicata | Coldenia plicata (Torr.) Coville | COPL |
| Tiquilia plicata | Tiquilia brevifolia Nutt. ex Torr. var. plicata Torr. | TIBRP |
| Torrey's cryptantha | Cryptantha torreyana (Gray) Greene | CRTO4 |
| Torrey's popcornflower | Plagiobothrys torreyi (Gray) Gray | PLTO |
| Torrey's popcornflower | Plagiobothrys torreyi (Gray) Gray var. diffusus (Greene) I.M. Johnston | PLTOD |
| Torrey's popcornflower | Plagiobothrys torreyi (Gray) Gray var. torreyi | PLTOT |
| Tournefortia argentea | Messerschmidia argentea (L. f.) Johnston | MEAR10 |
| Tournefortia maculata | Tournefortia peruviana Poir. p.p. | TOPE2 |
| Tournefortia volubilis | Myriopus poliochros (Spreng.) Small | MYPO |
| Tournefortia volubilis | Myriopus volubilis (L.) Small | MYVO |
| Tournefortia volubilis | Tournefortia microphylla Bertol. ex Spreng. | TOMI3 |
| Tournefortia volubilis | Tournefortia poliochros Spreng. | TOPO |
| Trask's cryptantha | Cryptantha traskiae I.M. Johnston | CRTR7 |
| Truckee cryptantha | Cryptantha glomeriflora Greene | CRGL3 |
| true forget-me-not | Myosotis scorpioides L. | MYSC |
| tuberous comfrey | Symphytum tuberosum L. | SYTU |
| tuberous stoneseed | Lithospermum tuberosum Rugel ex DC. | LITU2 |
| tufted cryptantha | Cryptantha caespitosa (A. Nels.) Payson | CRCA7 |
| Tulare cryptantha | Cryptantha incana Greene | CRIN7 |
| turnsole heliotrope | Heliotropium undulatifolium Turrill | HEUN8 |
| twining soldierbush | Tournefortia volubilis L. | TOVO |
| Uinta basin cryptantha | Cryptantha breviflora (Osterhout) Payson | CRBR7 |
| valley popcornflower | Plagiobothrys canescens Benth. | PLCA2 |
| valley popcornflower | Plagiobothrys canescens Benth. var. canescens | PLCAC3 |
| velvet stickseed | Hackelia velutina (Piper) I.M. Johnston | HAVE |
| velvetleaf soldierbush | Tournefortia argentea L. f. | TOAR2 |
| violet-vein viper's bugloss | Echium lusitanicum L. | ECLU |
| viper's bugloss | Echium L. | ECHIU |
| Virgin River cryptantha | Cryptantha virginensis (M.E. Jones) Payson | CRVI5 |
| Virginia bluebells | Mertensia virginica (L.) Pers. ex Link | MEVI3 |
| Wallowa cryptantha | Cryptantha subcapitata Dorn & Lichvar | CRSU15 |
| Waterton Lakes cryptantha | Cryptantha sobolifera Payson | CRSO3 |
| Watson's cryptantha | Cryptantha watsonii (Gray) Greene | CRWA2 |
| wavy heliotrope | Heliotropium ramosissimum (Lehm.) DC. | HERA7 |
| weakstem cryptantha | Cryptantha flaccida (Dougl. ex Lehm.) Greene | CRFL4 |
| Weber's cryptantha | Cryptantha weberi I.M. Johnston | CRWE2 |
| Welsh's cryptantha | Cryptantha welshii Thorne & Higgins | CRWE5 |
| West Indian soldierbush | Tournefortia scabra Lam. | TOSC3 |
| western hound's tongue | Cynoglossum occidentale Gray | CYOC |
| western marbleseed | Onosmodium bejariense DC. ex A. DC. var. occidentale (Mackenzie) B.L. Turner | ONBEO |
| western stoneseed | Lithospermum ruderale Dougl. ex Lehm. | LIRU4 |
| Wetherill's cryptantha | Cryptantha wetherillii (Eastw.) Payson | CRWE3 |
| whiteflower navelwort | Omphalodes linifolia (L.) Moench | OMLI |
| whitethroat | Dasynotus I.M. Johnston | DASYN |
| wild comfrey | Cynoglossum virginianum L. | CYVI |
| wild comfrey | Cynoglossum virginianum L. var. boreale (Fern.) Cooperrider | CYVIB |
| wild comfrey | Cynoglossum virginianum L. var. virginianum | CYVIV |
| wild Job's tears | Onosmodium virginianum (L.) A. DC. | ONVI2 |
| winged cryptantha | Cryptantha holoptera (Gray) J.F. Macbr. | CRHO3 |
| wingnut cryptantha | Cryptantha pterocarya (Torr.) Greene | CRPT |
| wingnut cryptantha | Cryptantha pterocarya (Torr.) Greene var. cycloptera (Greene) J.F. Macbr. | CRPTC |
| wingnut cryptantha | Cryptantha pterocarya (Torr.) Greene var. pterocarya | CRPTP2 |
| wingnut cryptantha | Cryptantha pterocarya (Torr.) Greene var. stenoloba I.M. Johnston | CRPTS |
| wonderful cryptantha | Cryptantha mirabunda Brand | CRMI7 |
| woodland forget-me-not | Myosotis sylvatica Ehrh. ex Hoffmann | MYSY |
| woody crinklemat | Tiquilia canescens (DC.) A. Richards. | TICA3 |
| woody crinklemat | Tiquilia canescens (DC.) A. Richards. var. canescens | TICAC |
| woody crinklemat | Tiquilia canescens (DC.) A. Richards. var. pulchella (I.M. Johnston) A. Richards. | TICAP |
| woolly breeches | Amsinckia spectabilis Fisch. & C.A. Mey. | AMSP3 |
| wrinkled cryptantha | Cryptantha rugulosa (Payson) Payson | CRRU4 |
| Yampa River cryptantha | Cryptantha stricta (Osterhout) Payson | CRST5 |
| yauco | Cordia gerascanthus L. | COGE |
| yellow monkswort | Nonea lutea (Desr.) Reichenb. ex DC. | NOLU |
| yellowwhite cryptantha | Cryptantha ochroleuca Higgins | CROC2 |