| Common Name | Scientific Name | Code |
| n/a | Populus ?heimburgeri Boivin [alba ? tremuloides] | POHE5 |
| n/a | Populus ?hinckleyana Correll (pro sp.) [angustifolia ? fremontii] | POHI8 |
| n/a | Populus ?inopina Eckenwalder [fremontii ? nigra] | POIN23 |
| n/a | Populus ?parryi Sarg. [balsamifera ? fremontii] | POPA11 |
| n/a | Populus ?petrowskiana R. I. Schrod. ex Regel | POPE25 |
| n/a | Populus ?rouleauiana Boivin [alba ? grandidentata] | PORO4 |
| n/a | Populus ?smithii Boivin [grandidentata ? tremuloides] | POSM2 |
| n/a | Populus tristis Fisch. | POTR23 |
| n/a | Salix ?bebbii Gandog. [eriocephala ? sericea] | SABE4 |
| n/a | Salix ?beschelii Boivin [bebbiana ? discolor] | SABE5 |
| n/a | Salix ?conifera Wangenh. (pro sp.) [discolor ? humilis] | SACO10 |
| n/a | Salix ?cryptodonta Fern. (pro sp.) [bebbiana ? candida] | SACR10 |
| n/a | Salix ?dichroa Doll | SADI8 |
| n/a | Salix ?dieckiana Suksdorf (pro sp.) [?geyeriana ? pedicellaris] | SADI3 |
| n/a | Salix ?ehrhartiana Sm. (pro sp.) [alba ? pentandra] | SAEH |
| n/a | Salix ?glatfelteri Schneid. [amygdaloides ? nigra] | SAGL3 |
| n/a | Salix ?grayi Schneid. [argyrocarpa ? planifolia] | SAGR7 |
| n/a | Salix ?hankensonii Dode [excluded] | SAHA6 |
| n/a | Salix ?laestadiana Hartm. | SALA22 |
| n/a | Salix ?peasei Fern. (pro sp.) [herbacea ? uva-ursi] | SAPE9 |
| n/a | Salix ?pontederana Willd. | SAPO9 |
| n/a | Salix ?princeps-ourayi L. Kelso [glauca ? monticola] | SAPR7 |
| n/a | Salix ?rubella Bebb [candida ? eriocephala] | SARU2 |
| n/a | Salix ?simulatrix F. B. White | SASI16 |
| n/a | Salix ?solheimii E.H. Kelso [reticulata ? rotundifolia] | SASO4 |
| n/a | Salix ?waghornei Rydb. (pro sp.) [arctica ? glauca] | SAWA |
| n/a | Salix aegyptiaca L. | SAAE6 |
| n/a | Salix apennina A. K. Skvortsov | SAAP5 |
| n/a | Salix excelsa S. G. Gmel. | SAEX7 |
| n/a | Salix glabra Scop. | SAGL80 |
| n/a | Salix gracilistyla Miq. var. melanostachys (Makino) C. K. Schneid. | SAGRM2 |
| n/a | Salix koreensis Andersson | SAKO2 |
| n/a | Salix mielichhoferi Saut. | SAMI22 |
| n/a | Salix miyabeana Seemen | SAMI23 |
| n/a | Salix muscina Dode ex Flod. | SAMU7 |
| n/a | Salix myrsinifolia Salisb. [excluded] | SAMY9 |
| n/a | Salix rosmarinifolia L. | SARO12 |
| n/a | Salix udensis Trautv. & C. A. Mey. | SAUD |
| n/a | Salix variegata Franch. | SAVA8 |
| Alaska bog willow | Salix fuscescens Anderss. | SAFU |
| almond willow | Salix triandra L. | SATR14 |
| alpine willow | Salix petrophila Rydb. | SAPE18 |
| arctic seashore willow | Salix ovalifolia Trautv. var. arctolitoralis (Hult?n) Argus | SAOVA |
| arctic willow | Salix arctica Pallas | SAAR27 |
| Arizona willow | Salix arizonica Dorn | SAAR14 |
| arroyo willow | Salix lasiolepis Benth. | SALA6 |
| arroyo willow | Salix lasiolepis Benth. var. lasiolepis | SALAL2 |
| Athabasca willow | Salix athabascensis Raup | SAAT |
| autumn willow | Salix serissima (Bailey) Fern. | SASE2 |
| balm-of-Gilead | Populus ?jackii Sarg. [balsamifera ? deltoides] | POJA2 |
| balsam poplar | Populus balsamifera L. | POBA2 |
| balsam poplar | Populus balsamifera L. ssp. balsamifera | POBAB2 |
| balsam willow | Salix pyrifolia Anderss. | SAPY |
| Barclay's willow | Salix barclayi Anderss. | SABA3 |
| Barratt's willow | Salix barrattiana Hook. | SABA4 |
| barren ground willow | Salix nummularia Anderss. | SANU4 |
| barrenground willow | Salix niphoclada Rydb. | SANI10 |
| basket willow | Salix viminalis L. | SAVI2 |
| bayberry willow | Salix myricoides Muhl. | SAMY2 |
| bayberry willow | Salix myricoides Muhl. var. albovestita (Ball) Dorn | SAMYA |
| bayberry willow | Salix myricoides Muhl. var. myricoides | SAMYM |
| bearberry willow | Salix uva-ursi Pursh | SAUV |
| Bebb willow | Salix bebbiana Sarg. | SABE2 |
| Bigelow's willow | Salix lasiolepis Benth. var. bigelovii (Torr.) Bebb | SALAB |
| bigtooth aspen | Populus grandidentata Michx. | POGR4 |
| black cottonwood | Populus balsamifera L. ssp. trichocarpa (Torr. & Gray ex Hook.) Brayshaw | POBAT |
| black willow | Salix nigra Marsh. | SANI |
| blueberry willow | Salix myrtillifolia Anderss. | SAMY |
| bog willow | Salix pedicellaris Pursh | SAPE2 |
| Bonpland willow | Salix bonplandiana Kunth | SABO |
| Booth's willow | Salix boothii Dorn | SABO2 |
| Brewer's willow | Salix breweri Bebb | SABR2 |
| Carolina poplar | Populus ?canadensis Moench (pro sp.) [deltoides ? nigra] | POCA19 |
| cascade willow | Salix cascadensis Cockerell | SACA6 |
| Chamisso's willow | Salix chamissonis Anderss. | SACH |
| Chinese white poplar | Populus tomentosa Carr. | POTO7 |
| coastal plain willow | Salix caroliniana Michx. | SACA5 |
| corkscrew willow | Salix matsudana Koidzumi | SAMA13 |
| Cottet willow | Salix ?cottetii Kerner | SACO28 |
| cottonwood | Populus L. | POPUL |
| crack willow | Salix fragilis L. | SAFR |
| creeping willow | Salix repens L. | SARE20 |
| daphne willow | Salix daphnoides Vill. | SADA4 |
| Del Norte willow | Salix delnortensis Schneid. | SADE2 |
| dewystem willow | Salix irrorata Anderss. | SAIR |
| diamondleaf willow | Salix planifolia Pursh | SAPL2 |
| diamondleaf willow | Salix planifolia Pursh ssp. planifolia | SAPLP4 |
| donian willow | Salix ?doniana Sm. | SADO10 |
| downy willow | Salix lapponum L. | SALA21 |
| Drummond's willow | Salix drummondiana Barratt ex Hook. | SADR |
| dune willow | Salix hookeriana Barratt ex Hook. | SAHO |
| dusky willow | Salix melanopsis Nutt. | SAME2 |
| eared willow | Salix aurita L. | SAAU9 |
| eastern cottonwood | Populus deltoides Bartr. ex Marsh. | PODE3 |
| eastern cottonwood | Populus deltoides Bartr. ex Marsh. ssp. deltoides | PODED |
| Elaeagnus willow | Salix elaeagnos Scop. | SAEL |
| European aspen | Populus tremula L. | POTR10 |
| false mountain willow | Salix pseudomonticola Ball | SAPS |
| Farr's willow | Salix farriae Ball | SAFA |
| feltleaf willow | Salix alaxensis (Anderss.) Coville | SAAL |
| feltleaf willow | Salix alaxensis (Anderss.) Coville var. alaxensis | SAALA |
| feltleaf willow | Salix alaxensis (Anderss.) Coville var. longistylis (Rydb.) Schneid. | SAALL |
| firmleaf willow | Salix pseudomyrsinites Anderss. | SAPS8 |
| Florida willow | Salix floridana Chapman | SAFL |
| Fremont cottonwood | Populus fremontii S. Wats. | POFR2 |
| Fremont cottonwood | Populus fremontii S. Wats. ssp. fremontii | POFRF3 |
| Fremont cottonwood | Populus fremontii S. Wats. ssp. mesetae Eckenwalder | POFRM |
| Geyer willow | Salix geyeriana Anderss. | SAGE2 |
| glacial willow | Salix ovalifolia Trautv. var. glacialis (Anderss.) Argus | SAOVG |
| goat willow | Salix caprea L. | SACA22 |
| Goodding's willow | Salix gooddingii Ball | SAGO |
| Graham's willow | Salix ?grahamii Borrer ex Baker | SAGR19 |
| gray poplar | Populus ?canescens (Ait.) Sm. (pro sp.) [alba ? tremula] | POCA14 |
| grayleaf willow | Salix glauca L. | SAGL |
| grayleaf willow | Salix glauca L. ssp. glauca | SAGLG |
| grayleaf willow | Salix glauca L. ssp. glauca var. acutifolia (Hook.) Schneid. | SAGLA |
| grayleaf willow | Salix glauca L. ssp. glauca var. glauca | SAGLG2 |
| grayleaf willow | Salix glauca L. ssp. glauca var. villosa (D. Don ex Hook.) Anderss. | SAGLV |
| green-leaf willow | Salix ?rubra Huds. | SARU5 |
| greenleaf willow | Salix lucida Muhl. ssp. caudata (Nutt.) E. Murr. | SALUC |
| halberd willow | Salix hastata L. | SAHA |
| heartleaf willow | Salix cordata Michx. | SACO3 |
| Humboldt's willow | Salix humboldtiana Willd. | SAHU |
| hybrid balsam poplar | Populus ?brayshawii Boivin [angustifolia ? balsamifera] | POBR7 |
| hybrid crack willow | Salix ?rubens Schrank (pro sp.) [alba ? fragilis] | SARU3 |
| Japanese poplar | Populus maximowiczii A. Henry | POMA41 |
| Jepson's willow | Salix jepsonii Schneid. | SAJE |
| kori-yanagi | Salix koriyanagi Kimura ex Goerz | SAKO3 |
| Labrador willow | Salix argyrocarpa Anderss. | SAAR7 |
| lanceleaf cottonwood | Populus ?acuminata Rydb. (pro sp.) [angustifolia ? deltoides] | POAC5 |
| large gray willow | Salix atrocinerea Brot. | SAAT2 |
| large gray willow | Salix cinerea L. | SACI |
| laurel willow | Salix pentandra L. | SAPE4 |
| least willow | Salix rotundifolia Trautv. | SARO2 |
| least willow | Salix rotundifolia Trautv. ssp. rotundifolia | SAROR |
| Lemmon's willow | Salix lemmonii Bebb | SALE |
| littletree willow | Salix arbusculoides Anderss. | SAAR3 |
| Lombardy poplar | Populus nigra L. | PONI |
| MacKenzie's willow | Salix prolixa Anderss. | SAPR3 |
| McCalla's willow | Salix maccalliana Rowlee | SAMA12 |
| meadow willow | Salix petiolaris Sm. | SAPE5 |
| Missouri River willow | Salix eriocephala Michx. | SAER |
| mountain willow | Salix eastwoodiae Cockerell ex Heller | SAEA |
| myrtle willow | Salix myrsinites L. | SAMY8 |
| narrowleaf cottonwood | Populus angustifolia James | POAN3 |
| narrowleaf willow | Salix exigua Nutt. | SAEX |
| netleaf willow | Salix reticulata L. | SARE2 |
| netleaf willow | Salix reticulata L. ssp. glabellicarpa Argus | SAREG |
| netleaf willow | Salix reticulata L. ssp. reticulata | SARER |
| northern willow | Salix arctophila Cockerell ex Heller | SAAR6 |
| northwest sandbar willow | Salix sessilifolia Nutt. | SASE3 |
| onecolor willow | Salix monochroma Ball | SAMO4 |
| oval-leaf willow | Salix ovalifolia Trautv. | SAOV |
| oval-leaf willow | Salix ovalifolia Trautv. var. cyclophylla (Rydb.) Ball | SAOVC |
| oval-leaf willow | Salix ovalifolia Trautv. var. ovalifolia | SAOVO |
| Pacific willow | Salix lucida Muhl. ssp. lasiandra (Benth.) E. Murr. | SALUL |
| park willow | Salix monticola Bebb | SAMO2 |
| peachleaf willow | Salix amygdaloides Anderss. | SAAM2 |
| plains cottonwood | Populus deltoides Bartr. ex Marsh. ssp. monilifera (Ait.) Eckenwalder | PODEM |
| polar willow | Salix polaris Wahlenb. | SAPO |
| Populus ?acuminata | Populus acuminata Rydb. var. rehderi Sarg. | POACR |
| Populus ?canadensis | Populus ?eugenei Simon-Louis | POEU |
| Populus ?canadensis | Populus ?robusta C. K. Schneid. | PORO11 |
| Populus ?canadensis | Populus canadensis Moench var. eugenei (Simon-Louis) Schelle | POCAE2 |
| Populus ?canadensis | Populus canadensis Moench var. serotina (T. Hartig) Rehd. | POCAS |
| Populus ?canadensis | Populus euramericana Guinier | POEU80 |
| Populus ?canescens | Populus alba L. var. canescens Ait. | POALC |
| Populus ?canescens | Populus hybrida Bieb. | POHY6 |
| Populus ?jackii | Populus ?andrewsii Sarg. | POAN18 |
| Populus ?jackii | Populus ?bernardii Boivin | POBE5 |
| Populus ?jackii | Populus ?dutillyi Lepage | PODU5 |
| Populus ?jackii | Populus ?generosa Henry | POGE4 |
| Populus ?jackii | Populus ?gileadensis Rouleau | POGI3 |
| Populus ?jackii | Populus manitobensis Dode | POMA21 |
| Populus ?smithii | Populus ?barnesii W.H. Wagner | POBA8 |
| Populus alba | Populus alba L. var. bolleana Lauche | POALB |
| Populus alba | Populus alba L. var. nivea Aiton | POALN |
| Populus alba | Populus alba L. var. pyramidalis Bunge | POALP |
| Populus angustifolia | Populus ?sennii Boivin | POSE14 |
| Populus angustifolia | Populus balsamifera L. var. angustifolia (James) S. Wats. | POBAA |
| Populus angustifolia | Populus canadensis Moench var. angustifolia (James) Wesmael | POCAA2 |
| Populus angustifolia | Populus fortissima A. Nels. & J.F. Macbr. | POFO5 |
| Populus angustifolia | Populus salicifolia Raf. | POSA18 |
| Populus angustifolia | Populus tweedyi Britt. | POTW2 |
| Populus balsamifera ssp. balsamifera | Populus balsamifera L. var. candicans (Ait.) Gray | POBAC2 |
| Populus balsamifera ssp. balsamifera | Populus balsamifera L. var. fernaldiana Rouleau | POBAF |
| Populus balsamifera ssp. balsamifera | Populus balsamifera L. var. lanceolata Marsh. | POBAL |
| Populus balsamifera ssp. balsamifera | Populus balsamifera L. var. michauxii (Dode) A. Henry | POBAM |
| Populus balsamifera ssp. balsamifera | Populus balsamifera L. var. subcordata Hyl. | POBAS2 |
| Populus balsamifera ssp. balsamifera | Populus candicans Ait. | POCA33 |
| Populus balsamifera ssp. balsamifera | Populus michauxii Dode | POMI7 |
| Populus balsamifera ssp. balsamifera | Populus tacamahaca P. Mill. | POTA2 |
| Populus balsamifera ssp. balsamifera | Populus tacamahaca P. Mill. var. candicans (Ait.) Stout | POTAC |
| Populus balsamifera ssp. balsamifera | Populus tacamahaca P. Mill. var. lanceolata (Marsh.) Farw. | POTAL |
| Populus balsamifera ssp. balsamifera | Populus tacamahaca P. Mill. var. michauxii (Dode) Farw. | POTAM2 |
| Populus balsamifera ssp. trichocarpa | Populus balsamifera L. var. californica S. Wats. | POBAC3 |
| Populus balsamifera ssp. trichocarpa | Populus hastata Dode p.p. | POHA15 |
| Populus balsamifera ssp. trichocarpa | Populus trichocarpa Torr. & Gray ex Hook. | POTR15 |
| Populus balsamifera ssp. trichocarpa | Populus trichocarpa Torr. & Gray ex Hook. ssp. hastata (Dode) Dode p.p. | POTRH |
| Populus balsamifera ssp. trichocarpa | Populus trichocarpa Torr. & Gray ex Hook. var. cupulata S. Wats. | POTRC |
| Populus balsamifera ssp. trichocarpa | Populus trichocarpa Torr. & Gray ex Hook. var. hastata (Dode) A. Henry p.p. | POTRH2 |
| Populus balsamifera ssp. trichocarpa | Populus trichocarpa Torr. & Gray ex Hook. var. ingrata (Jepson) Jepson | POTRI |
| Populus deltoides ssp. deltoides | Populus angulata Ait. | POAN15 |
| Populus deltoides ssp. deltoides | Populus angulata Ait. var. missouriensis A. Henry | POANM |
| Populus deltoides ssp. deltoides | Populus balsamifera L. var. missouriensis (A. Henry) Rehd. | POBAM2 |
| Populus deltoides ssp. deltoides | Populus balsamifera L. var. pilosa Sarg. | POBAP |
| Populus deltoides ssp. deltoides | Populus balsamifera L. var. virginiana (Foug.) Sarg. | POBAV |
| Populus deltoides ssp. deltoides | Populus canadensis Moench var. virginiana (Foug.) Fiori | POCAV2 |
| Populus deltoides ssp. deltoides | Populus deltoides Bartr. ex Marsh. var. angulata (Ait.) Sarg. | PODEA |
| Populus deltoides ssp. deltoides | Populus deltoides Bartr. ex Marsh. var. missouriensis (A. Henry) A. Henry | PODEM2 |
| Populus deltoides ssp. deltoides | Populus deltoides Bartr. ex Marsh. var. pilosa (Sarg.) Sudworth | PODEP |
| Populus deltoides ssp. deltoides | Populus deltoides Bartr. ex Marsh. var. virginiana (Foug.) Sudworth | PODEV |
| Populus deltoides ssp. deltoides | Populus nigra L. var. virginiana (Foug.) Castigl. | PONIV2 |
| Populus deltoides ssp. deltoides | Populus palmeri Sarg. | POPA25 |
| Populus deltoides ssp. deltoides | Populus virginiana Foug. | POVI13 |
| Populus deltoides ssp. deltoides | Populus virginiana Foug. var. pilosa (Sarg.) F.C. Gates | POVIP2 |
| Populus deltoides ssp. monilifera | Monilistus monilifera (Ait.) Raf. ex B.D. Jackson | MOMO3 |
| Populus deltoides ssp. monilifera | Populus besseyana Dode | POBE4 |
| Populus deltoides ssp. monilifera | Populus deltoides Bartr. ex Marsh. var. occidentalis Rydb. | PODEO |
| Populus deltoides ssp. monilifera | Populus monilifera Ait. | POMO14 |
| Populus deltoides ssp. monilifera | Populus occidentalis (Rydb.) Britt. ex Rydb. | POOC5 |
| Populus deltoides ssp. monilifera | Populus sargentii Dode | POSA8 |
| Populus deltoides ssp. monilifera | Populus sargentii Dode var. texana (Sarg.) Correll | POSAT |
| Populus deltoides ssp. monilifera | Populus texana Sarg. | POTE9 |
| Populus deltoides ssp. wislizeni | Populus deltoides Bartr. ex Marsh. var. wislizeni (S. Wats.) Dorn | PODEW3 |
| Populus deltoides ssp. wislizeni | Populus fremontii S. Wats. var. wislizeni S. Wats. | POFRW2 |
| Populus deltoides ssp. wislizeni | Populus wislizeni (S. Wats.) Sarg. | POWI3 |
| Populus fremontii ssp. fremontii | Populus arizonica Sarg. | POAR16 |
| Populus fremontii ssp. fremontii | Populus arizonica Sarg. var. jonesii Sarg. | POARJ |
| Populus fremontii ssp. fremontii | Populus canadensis Moench var. fremontii (S. Wats.) Kuntze | POCAF |
| Populus fremontii ssp. fremontii | Populus fremontii S. Wats. var. arizonica (Sarg.) Jepson | POFRA |
| Populus fremontii ssp. fremontii | Populus fremontii S. Wats. var. macdougalii (Rose) Jepson | POFRM2 |
| Populus fremontii ssp. fremontii | Populus fremontii S. Wats. var. macrodisca Sarg. | POFRM4 |
| Populus fremontii ssp. fremontii | Populus fremontii S. Wats. var. pubescens Sarg. | POFRP |
| Populus fremontii ssp. fremontii | Populus fremontii S. Wats. var. thornberi Sarg. | POFRT3 |
| Populus fremontii ssp. fremontii | Populus fremontii S. Wats. var. toumeyi Sarg. | POFRT2 |
| Populus fremontii ssp. fremontii | Populus macdougalii Rose | POMA23 |
| Populus fremontii ssp. mesetae | Populus fremontii S. Wats. var. mesetae (Eckenwalder) Little | POFRM3 |
| Populus fremontii ssp. mesetae | Populus mexicana auct. non Wesmael [misapplied] | POME10 |
| Populus grandidentata | Populus grandidentata Michx. var. angustata Victorin | POGRA2 |
| Populus grandidentata | Populus grandidentata Michx. var. meridionalis Tidestrom | POGRM4 |
| Populus grandidentata | Populus grandidentata Michx. var. subcordata Victorin | POGRS |
| Populus heterophylla | Populus argentea Michx. f. | POAR15 |
| Populus nigra | Populus dilatata Ait. | PODI8 |
| Populus nigra | Populus italica (Du Roi) Moench | POIT |
| Populus nigra | Populus nigra L. var. italica Du Roi | PONII |
| Populus tremuloides | Populus ?polygonifolia Bernard | POPO12 |
| Populus tremuloides | Populus aurea Tidestrom | POAU8 |
| Populus tremuloides | Populus cercidiphylla Britt. | POCE6 |
| Populus tremuloides | Populus tremula L. ssp. tremuloides (Michx.) A.& D. L?ve | POTRT |
| Populus tremuloides | Populus tremuloides Michx. var. aurea (Tidestrom) Daniels | POTRA |
| Populus tremuloides | Populus tremuloides Michx. var. cercidiphylla (Britt.) Sudworth | POTRC2 |
| Populus tremuloides | Populus tremuloides Michx. var. intermedia Victorin | POTRI2 |
| Populus tremuloides | Populus tremuloides Michx. var. magnifica Victorin | POTRM |
| Populus tremuloides | Populus tremuloides Michx. var. rhomboidea Victorin | POTRR |
| Populus tremuloides | Populus tremuloides Michx. var. vancouveriana (Trel.) Sarg. | POTRV |
| Populus tremuloides | Populus vancouveriana Trel. | POVA11 |
| prairie willow | Salix humilis Marsh. | SAHU2 |
| prairie willow | Salix humilis Marsh. var. humilis | SAHUH |
| prairie willow | Salix humilis Marsh. var. tristis (Ait.) Griggs | SAHUT |
| purpleosier willow | Salix purpurea L. | SAPU2 |
| pussy willow | Salix discolor Muhl. | SADI |
| quaking aspen | Populus tremuloides Michx. | POTR5 |
| red willow | Salix laevigata Bebb | SALA3 |
| Richardson's willow | Salix richardsonii Hook. | SARI4 |
| Rio Grande cottonwood | Populus deltoides Bartr. ex Marsh. ssp. wislizeni (S. Wats.) Eckenwalder | PODEW |
| rock willow | Salix vestita Pursh | SAVE |
| rose-gold pussy willow | Salix gracilistyla Miq. | SAGR10 |
| sageleaf willow | Salix candida Fluegg? ex Willd. | SACA4 |
| Salix ?conifera | Salix discolor Muhl. var. latifolia Anderss. | SADIL |
| Salix ?ehrhartiana | Salix ?jesupii Fern. | SAJE4 |
| Salix ?pendulina | Salix ?blanda Anderss. (pro sp.) [not hybrid] | SABL2 |
| Salix ?pendulina | Salix babylonica auct. non L. p.p. [misapplied] | SABA2 |
| Salix ?pendulina | Salix elegantissima K. Koch | SAEL4 |
| Salix ?pendulina | Salix pendulina Wenderoth var. blanda (Anderss.) Meikle ex auct. ined. | SAPEB |
| Salix ?pendulina | Salix pendulina Wenderoth var. elegantissima (K. Koch) Meikle | SAPEE |
| Salix ?sepulcralis | Salix ?chrysocoma Dode | SACH17 |
| Salix ?sepulcralis | Salix ?sepulcralis Simonkai var. chrysocoma (Dode) Meikle | SASEC3 |
| Salix ?sepulcralis | Salix babylonica auct. non L. p.p. [misapplied] | SABA2 |
| Salix ?sepulcralis | Salix salomonii hort. | SASA16 |
| Salix alaxensis var. alaxensis | Salix alaxensis (Anderss.) Coville var. obovalifolia Ball | SAALO |
| Salix alaxensis var. alaxensis | Salix speciosa Hook. & Arn. var. alaxensis Anderss. | SASPA |
| Salix alaxensis var. alaxensis | Salix speciosa Hook. & Arn., non Host nec Nutt. | SASP9 |
| Salix alaxensis var. longistylis | Salix alaxensis (Anderss.) Coville ssp. longistylis (Rydb.) Hult | SAALL2 |
| Salix alaxensis var. longistylis | Salix longistylis Rydb. | SALO15 |
| Salix alba | Salix alba L. ssp. caerulea (Sm.) Rech. f. | SAALC2 |
| Salix alba | Salix alba L. ssp. vitellina (L.) Arcang. | SAALV2 |
| Salix alba | Salix alba L. var. caerulea (Sm.) Sm. | SAALC |
| Salix alba | Salix alba L. var. calva G.F.W. Mey. | SAALC3 |
| Salix alba | Salix alba L. var. vitellina (L.) Stokes | SAALV |
| Salix alba | Salix vitellina L. | SAVI80 |
| Salix amygdaloides | Salix amygdaloides Anderss. var. wrightii (Anderss.) Schneid. | SAAMW |
| Salix amygdaloides | Salix nigra Marsh. var. amygdaloides (Anderss.) Anderss. | SANIA |
| Salix amygdaloides | Salix nigra Marsh. var. wrightii (Anderss.) Anderss. | SANIW |
| Salix amygdaloides | Salix wrightii Anderss. | SAWR3 |
| Salix arbusculoides | Salix acutifolia auct. non Hook. [misapplied] | SAAC2 |
| Salix arbusculoides | Salix humillima Anderss. | SAHU3 |
| Salix arbusculoides | Salix humillima Anderss. var. puberula (Anderss.) Anderss. | SAHUP |
| Salix arbusculoides | Salix saskatchevana von Seem. | SASA15 |
| Salix arctica | Salix anglorum auct. non Cham. [misapplied] | SAAN5 |
| Salix arctica | Salix anglorum Cham. var. antiplasta Schneid. | SAANA |
| Salix arctica | Salix anglorum Cham. var. araioclada Schneid. | SAANA2 |
| Salix arctica | Salix anglorum Cham. var. kophophylla Schneid. | SAANK |
| Salix arctica | Salix arctica Pallas ssp. crassijulis (Trautv.) Skvort. | SAARC |
| Salix arctica | Salix arctica Pallas ssp. tortulosa (Trautv.) Hult | SAART |
| Salix arctica | Salix arctica Pallas var. antiplasta (Schneid.) Fern. | SAARA |
| Salix arctica | Salix arctica Pallas var. araioclada (Schneid.) Raup | SAARA2 |
| Salix arctica | Salix arctica Pallas var. brownei Anderss. | SAARB |
| Salix arctica | Salix arctica Pallas var. kophophylla (Schneid.) Polunin | SAARK |
| Salix arctica | Salix arctica Pallas var. pallasii (Anderss.) Kurtz | SAARP3 |
| Salix arctica | Salix arctica Pallas var. tortulosa (Trautv.) Raup | SAART2 |
| Salix arctica | Salix arctica R. Br. ex Richards., non Pallas | SAAR16 |
| Salix arctica | Salix brownei (Anderss.) Bebb | SABR15 |
| Salix arctica | Salix crassijulis Trautv. | SACR5 |
| Salix arctica | Salix hudsonensis Schneid. | SAHU4 |
| Salix arctica | Salix pallasii Anderss. | SAPA18 |
| Salix arctica | Salix pallasii Anderss. var. crassijulis (Trautv.) Anderss. | SAPAC2 |
| Salix arctica | Salix tortulosa Trautv. | SATO3 |
| Salix arctophila | Salix arctica Liebm., non Pallas | SAAR4 |
| Salix arctophila | Salix arctophila Cockerell ex Heller var. lejocarpa (Anderss.) Schneid. | SAARL |
| Salix arctophila | Salix groenlandica Lundstr. var. lejocarpa (Anderss.) Lange | SAGRL |
| Salix arctophila | Salix groenlandica Lundstr., non Heer | SAGR12 |
| Salix argyrocarpa | Salix argyrocarpa Anderss. var. denudata Anderss. | SAARD |
| Salix argyrocarpa | Salix labradorica Rydb. var. pumila Nutt. | SALAP3 |
| Salix athabascensis | Salix fallax Raup | SAFA10 |
| Salix athabascensis | Salix pedicellaris Pursh var. athabascensis (Raup) Boivin | SAPEA |
| Salix atrocinerea | Salix cinerea L. ssp. atrocinerea (Brot.) Guinier | SACIA |
| Salix atrocinerea | Salix cinerea L. ssp. oleifolia (Sm.) Macreight | SACIO |
| Salix atrocinerea | Salix oleifolia Sm., non Vill. | SAOL |
| Salix barclayi | Salix barclayi Anderss. var. angustifolia (Anderss.) Anderss. ex Schneid. | SABAA |
| Salix barclayi | Salix barclayi Anderss. var. conjuncta (Bebb) Ball ex Schneid. | SABAC |
| Salix barclayi | Salix conjuncta Bebb | SACO21 |
| Salix barclayi | Salix hoyeriana Dieck | SAHO6 |
| Salix barclayi | Salix pyrolifolia Anderss. var. hoyeriana (Dieck) Dippel | SAPYH |
| Salix barclayi | Salix regelii Anderss. | SARE15 |
| Salix barrattiana | Salix albertana Rowlee | SAAL15 |
| Salix barrattiana | Salix barrattiana Hook. var. angustifolia Anderss. | SABAA2 |
| Salix barrattiana | Salix barrattiana Hook. var. latifolia Anderss. | SABAL2 |
| Salix barrattiana | Salix barrattiana Hook. var. marcescens Raup | SABAM |
| Salix bebbiana | Salix bebbiana Sarg. var. capreifolia (Fern.) Fern. | SABEC |
| Salix bebbiana | Salix bebbiana Sarg. var. depilis Raup | SABED |
| Salix bebbiana | Salix bebbiana Sarg. var. luxurians (Fern.) Fern. | SABEL |
| Salix bebbiana | Salix bebbiana Sarg. var. perrostrata (Rydb.) Schneid. | SABEP |
| Salix bebbiana | Salix bebbiana Sarg. var. projecta (Fern.) Schneid. | SABEP2 |
| Salix bebbiana | Salix depressa L. ssp. rostrata (Richards.) Hiitonen | SADER |
| Salix bebbiana | Salix livida Wahlenb. var. occidentalis (Anderss.) Gray | SALIO |
| Salix bebbiana | Salix livida Wahlenb. var. rostrata (Richards.) Dippel | SALIR |
| Salix bebbiana | Salix perrostrata Rydb. | SAPE20 |
| Salix bebbiana | Salix rostrata Richards. var. capreifolia Fern. | SAROC |
| Salix bebbiana | Salix rostrata Richards. var. luxurians Fern. | SAROL |
| Salix bebbiana | Salix rostrata Richards. var. perrostrata (Rydb.) Fern. | SAROP |
| Salix bebbiana | Salix rostrata Richards. var. projecta Fern. | SAROP2 |
| Salix bebbiana | Salix rostrata Richards., non Thuill. | SARO6 |
| Salix bebbiana | Salix starkeana Willd. ssp. bebbiana (Sarg.) Youngberg | SASTB |
| Salix bebbiana | Salix vagans Hook. f. ex Anderss. var. occidentalis Anderss. | SAVAO |
| Salix bebbiana | Salix vagans Hook. f. ex Anderss. var. rostrata (Richards.) Anderss. | SAVAR |
| Salix bonplandiana | Salix bonplandiana Kunth var. toumeyi (Britt. & Shafer) Schneid. | SABOT |
| Salix bonplandiana | Salix toumeyi Britt. & Shafer | SATO5 |
| Salix boothii | Salix curtiflora auct. non Anderss. [misapplied] | SACU7 |
| Salix boothii | Salix myrtillifolia Anderss. var. curtiflora auct. non (Anderss.) Bebb ex Rose [misapplied] | SAMYC2 |
| Salix boothii | Salix myrtillifolia auct. non Anderss. [misapplied] | SAMY4 |
| Salix boothii | Salix novae-angliae auct. non Anderss. [misapplied] | SANO2 |
| Salix boothii | Salix pseudocordata (Anderss.) Rydb. var. aequalis (Anderss.) Ball ex Schneid. | SAPSA |
| Salix boothii | Salix pseudocordata auct. non (Anderss.) Rydb. [misapplied] | SAPS3 |
| Salix boothii | Salix pseudomyrsinites Anderss. var. aequalis (Anderss.) Anderss. ex Ball | SAPSA2 |
| Salix boothii | Salix pseudomyrsinites auct. non Anderss. [misapplied] | SAPS5 |
| Salix brachycarpa | Salix brachycarpa Nutt. ssp. brachycarpa Nutt. [superfluous autonym] | SABRB6 |
| Salix brachycarpa var. brachycarpa | Salix brachycarpa Nutt. var. alticola E.H. Kelso | SABRA3 |
| Salix brachycarpa var. brachycarpa | Salix brachycarpa Nutt. var. antimima (Schneid.) Raup | SABRA4 |
| Salix brachycarpa var. brachycarpa | Salix brachycarpa Nutt. var. glabellicarpa Schneid. | SABRG |
| Salix brachycarpa var. brachycarpa | Salix brachycarpa Nutt. var. sansonii Ball | SABRS |
| Salix brachycarpa var. brachycarpa | Salix chlorolepis Fern. var. antimima Schneid. | SACHA |
| Salix brachycarpa var. brachycarpa | Salix desertorum Richards. var. fruticulosa Anderss. | SADEF |
| Salix brachycarpa var. brachycarpa | Salix desertorum Richards. var. stricta Anderss. | SADES2 |
| Salix brachycarpa var. brachycarpa | Salix stricta (Anderss.) Rydb. | SAST10 |
| Salix calcicola | Salix calcicola Fern. & Wieg. var. glandulosior Boivin | SACAG5 |
| Salix calcicola | Salix calcicola Fern. & Wieg. var. nicholsiana Polunin | SACAN3 |
| Salix calcicola | Salix lanata L. ssp. calcicola (Fern. & Wieg.) Hult | SALAC2 |
| Salix calcicola | Salix richardsonii Hook. var. macouniana Bebb | SARIM |
| Salix candida | Salix candida Fluegg? ex Willd. var. denudata Anderss. | SACAD |
| Salix candida | Salix candida Fluegg? ex Willd. var. tomentosa Anderss. | SACAT2 |
| Salix candida | Salix candidula Nieuwl. | SACA34 |
| Salix caroliniana | Salix amphibia Small | SAAM6 |
| Salix caroliniana | Salix harbisonii Schneid. | SAHA10 |
| Salix caroliniana | Salix longipes Shuttlw. ex Anderss. | SALO7 |
| Salix caroliniana | Salix longipes Shuttlw. ex Anderss. var. pubescens Anderss. | SALOP |
| Salix caroliniana | Salix longipes Shuttlw. ex Anderss. var. venulosa (Anderss.) Schneid. | SALOV |
| Salix caroliniana | Salix longipes Shuttlw. ex Anderss. var. wardii (Bebb) Schneid. | SALOW |
| Salix caroliniana | Salix nigra Marsh. var. longipes (Shuttlw. ex Anderss.) Bebb | SANIL5 |
| Salix caroliniana | Salix nigra Marsh. var. wardii Bebb | SANIW2 |
| Salix caroliniana | Salix occidentalis Bosc ex K. Koch var. longipes (Shuttlw. ex Anderss.) Bebb | SAOCL2 |
| Salix caroliniana | Salix occidentalis Bosc ex K. Koch, non Walt. | SAOC7 |
| Salix caroliniana | Salix pitcheriana Barratt | SAPI4 |
| Salix caroliniana | Salix wardii (Bebb) Bebb | SAWA5 |
| Salix cascadensis | Salix brownii (Anderss.) Bebb var. tenera (Anderss.) M.E. Jones | SABRT2 |
| Salix cascadensis | Salix cascadensis Cockerell var. thompsonii Brayshaw | SACAT3 |
| Salix cascadensis | Salix tenera Anderss. | SATE6 |
| Salix cinerea | Salix cinerea L. ssp. cinerea L. [superfluous autonym] | SACIC |
| Salix commutata | Salix barclayi Anderss. var. commutata (Bebb) L. Kelso | SABAC3 |
| Salix commutata | Salix commutata Bebb var. denudata Bebb | SACOD |
| Salix commutata | Salix commutata Bebb var. mixta Piper | SACOM |
| Salix commutata | Salix commutata Bebb var. puberula Bebb | SACOP |
| Salix commutata | Salix commutata Bebb var. sericea Bebb | SACOS |
| Salix cordata | Salix adenophylla Hook. | SAAD2 |
| Salix cordata | Salix syrticola Fern. | SASY4 |
| Salix delnortensis | Salix breweri Bebb var. delnortensis (Schneid.) Jepson | SABRD |
| Salix discolor | Salix ancorifera Fern. | SAAN7 |
| Salix discolor | Salix conformis Forbes | SACO17 |
| Salix discolor | Salix crassa Barratt | SACR6 |
| Salix discolor | Salix discolor Muhl. var. overi Ball | SADIO |
| Salix discolor | Salix discolor Muhl. var. prinoides (Pursh) Anderss. | SADIP |
| Salix discolor | Salix discolor Muhl. var. rigidior (Anderss.) Schneid. | SADIR |
| Salix discolor | Salix fuscata Pursh | SAFU5 |
| Salix discolor | Salix prinoides Pursh | SAPR8 |
| Salix discolor | Salix sensitiva Barratt | SASE11 |
| Salix discolor | Salix squamata Rydb. | SASQ2 |
| Salix drummondiana | Salix bella Piper | SABE6 |
| Salix drummondiana | Salix covillei Eastw. | SACO15 |
| Salix drummondiana | Salix drummondiana Barratt ex Hook. ssp. subcaerulea (Piper) E. Murr. | SADRS |
| Salix drummondiana | Salix drummondiana Barratt ex Hook. var. bella (Piper) Ball | SADRB |
| Salix drummondiana | Salix drummondiana Barratt ex Hook. var. subcaerulea (Piper) Ball | SADRS2 |
| Salix drummondiana | Salix pachnophora Rydb. | SAPA25 |
| Salix drummondiana | Salix subcaerulea Piper | SASU9 |
| Salix eastwoodiae | Salix californica Bebb | SACA35 |
| Salix elaeagnos | Salix incana Schrank | SAIN6 |
| Salix eriocephala | Salix acutidens Rydb. | SAAC3 |
| Salix eriocephala | Salix angustata Pursh | SAAN9 |
| Salix eriocephala | Salix cordata Michx. var. abrasa Fern. | SACOA |
| Salix eriocephala | Salix cordata Michx. var. rigida (Muhl.) Boivin | SACOR2 |
| Salix eriocephala | Salix cordata Muhl. ssp. rigida (Muhl.) Anderss. | SACOR |
| Salix eriocephala | Salix cordata Muhl. var. angustata (Pursh) Anderss. | SACOA3 |
| Salix eriocephala | Salix cordata Muhl. var. missouriensis (Bebb) Mackenzie & Bush | SACOM6 |
| Salix eriocephala | Salix cordata Muhl. var. vestita (Anderss.) Bebb (pro syn.) | SACOV |
| Salix eriocephala | Salix cordata Muhl., non Michx. | SACO24 |
| Salix eriocephala | Salix discolor Muhl. var. eriocephala (Michx.) Anderss. | SADIE |
| Salix eriocephala | Salix missouriensis Bebb | SAMI13 |
| Salix eriocephala | Salix myricoides Muhl. var. angustata (Pursh) Dippel | SAMYA2 |
| Salix eriocephala | Salix myricoides Muhl. var. cordata (Muhl.) Dippel | SAMYC3 |
| Salix eriocephala | Salix myricoides Muhl. var. rigida (Muhl.) Dippel | SAMYR |
| Salix eriocephala | Salix rigida Muhl. | SARI2 |
| Salix eriocephala | Salix rigida Muhl. var. angustata (Pursh) Fern. | SARIA |
| Salix eriocephala | Salix rigida Muhl. var. vestita (Anderss.) Ball | SARIV |
| Salix eriocephala | Salix torreyana Barratt | SATO4 |
| Salix excelsa | Salix oxica Dode | SAOX2 |
| Salix exigua | Salix argophylla Nutt. | SAAR18 |
| Salix exigua | Salix exigua Nutt. var. angustissima (Anderss.) Reveal & Broome | SAEXA |
| Salix exigua | Salix exigua Nutt. var. columbiana Dorn | SAEXC |
| Salix exigua | Salix exigua Nutt. var. hindsiana (Benth.) Dorn | SAEXH |
| Salix exigua | Salix exigua Nutt. var. luteosericea (Rydb.) Schneid. | SAEXL |
| Salix exigua | Salix exigua Nutt. var. nevadensis (S. Wats.) Schneid. | SAEXN |
| Salix exigua | Salix exigua Nutt. var. parishiana (Rowlee) Jepson | SAEXP |
| Salix exigua | Salix exigua Nutt. var. stenophylla (Rydb.) Schneid. | SAEXS |
| Salix exigua | Salix exigua Nutt. var. virens Rowlee | SAEXV |
| Salix exigua | Salix fluviatilis Nutt. var. argophylla (Nutt.) Sarg. | SAFLA |
| Salix exigua | Salix hindsiana Benth. | SAHI9 |
| Salix exigua | Salix hindsiana Benth. var. leucodendroides (Rowlee) Ball | SAHIL |
| Salix exigua | Salix hindsiana Benth. var. parishiana (Rowlee) Ball | SAHIP3 |
| Salix exigua | Salix hindsiana Benth. var. tenuifolia (Anderss.) Anderss. | SAHIT |
| Salix exigua | Salix interior Rowlee var. angustissima (Anderss.) Dayton | SAINA |
| Salix exigua | Salix interior Rowlee var. luteosericea (Rydb.) Schneid. | SAINL |
| Salix exigua | Salix linearifolia Rydb. | SALI2 |
| Salix exigua | Salix longifolia Muhl. var. argophylla (Nutt.) Anderss. | SALOA3 |
| Salix exigua | Salix longifolia Muhl. var. exigua (Nutt.) Bebb | SALOE |
| Salix exigua | Salix longifolia Muhl. var. opaca Anderss. | SALOO |
| Salix exigua | Salix luteosericea Rydb. | SALU3 |
| Salix exigua | Salix macrostachya Nutt. var. leucodendroides Rowlee | SAMAL |
| Salix exigua | Salix malacophylla Nutt. ex Ball | SAMA18 |
| Salix exigua | Salix nevadensis S. Wats. | SANE6 |
| Salix exigua | Salix parishiana Rowlee | SAPA16 |
| Salix exigua | Salix sessilifolia Nutt. ssp. hindsiana (Benth.) Andersson | SASEH2 |
| Salix exigua | Salix sessilifolia Nutt. var. hindsiana (Benth.) Anderss. | SASEH |
| Salix exigua | Salix sessilifolia Nutt. var. leucodendroides (Rowlee) Schneid. | SASEL |
| Salix exigua | Salix stenophylla Rydb. | SAST12 |
| Salix exigua | Salix thurberi Rowlee | SATH3 |
| Salix farriae | Salix farriae Ball var. microserrulata Ball | SAFAM |
| Salix farriae | Salix hastata L. var. farriae (Ball) Hult | SAHAF |
| Salix floridana | Salix astatulana Murrill & Palmer | SAAS2 |
| Salix floridana | Salix chapmanii Small | SACH13 |
| Salix fuscescens | Salix arbutifolia auct. non Pallas [misapplied] | SAAR20 |
| Salix fuscescens | Salix fuscescens Anderss. var. reducta Ball | SAFUR |
| Salix geyeriana | Salix geyeriana Anderss. ssp. argentea (Bebb) E. Murr. | SAGEA |
| Salix geyeriana | Salix geyeriana Anderss. var. argentea (Bebb) Schneid. | SAGEA2 |
| Salix geyeriana | Salix geyeriana Anderss. var. meleina J.K. Henry | SAGEM |
| Salix geyeriana | Salix macrocarpa Nutt. | SAMA15 |
| Salix geyeriana | Salix macrocarpa Nutt. var. argentea Bebb | SAMAA |
| Salix geyeriana | Salix meleina (J.K. Henry) G.N. Jones | SAME11 |
| Salix glauca ssp. glauca var. acutifolia | Salix glauca L. ssp. acutifolia (Hook.) Hult | SAGLA3 |
| Salix glauca ssp. glauca var. acutifolia | Salix glauca L. var. alicea Ball | SAGLA4 |
| Salix glauca ssp. glauca var. acutifolia | Salix glauca L. var. perstipulata Raup | SAGLP |
| Salix glauca ssp. glauca var. acutifolia | Salix glauca L. var. poliophylla (Schneid.) Raup | SAGLP3 |
| Salix glauca ssp. glauca var. acutifolia | Salix glauca L. var. seemanii (Rydb.) Ostenf. | SAGLS2 |
| Salix glauca ssp. glauca var. acutifolia | Salix seemanii Rydb. | SASE14 |
| Salix glauca ssp. glauca var. acutifolia | Salix villosa D. Don ex Hook. var. acutifolia Hook. | SAVIA2 |
| Salix glauca ssp. glauca var. glauca | Salix kobayashii Kimura | SAKO |
| Salix glauca ssp. glauca var. villosa | Salix arctica Pallas var. subcordata (Anderss.) Schneid. | SAARS |
| Salix glauca ssp. glauca var. villosa | Salix desertorum Richards. | SADE7 |
| Salix glauca ssp. glauca var. villosa | Salix desertorum Richards. var. elata Anderss. | SADEE |
| Salix glauca ssp. glauca var. villosa | Salix glauca L. ssp. desertorum (Richards.) Hult | SAGLD |
| Salix glauca ssp. glauca var. villosa | Salix glauca L. ssp. glabrescens (Anderss.) Hult | SAGLG3 |
| Salix glauca ssp. glauca var. villosa | Salix glauca L. var. glabrescens (Anderss.) Schneid. | SAGLG5 |
| Salix glauca ssp. glauca var. villosa | Salix glauca L. var. kenosha (L. Kelso) L. Kelso | SAGLK |
| Salix glauca ssp. glauca var. villosa | Salix glauca L. var. pseudolapponum (von Seem.) L. Kelso | SAGLP2 |
| Salix glauca ssp. glauca var. villosa | Salix glauca L. var. sericea Hult | SAGLS3 |
| Salix glauca ssp. glauca var. villosa | Salix glauca L. var. subincurva (E.H. Kelso) L. Kelso | SAGLS4 |
| Salix glauca ssp. glauca var. villosa | Salix glaucops Anderss. | SAGL10 |
| Salix glauca ssp. glauca var. villosa | Salix glaucops Anderss. var. glabrescens Anderss. | SAGLG4 |
| Salix glauca ssp. glauca var. villosa | Salix glaucops Anderss. var. villosa (D. Don ex Hook.) Anderss. | SAGLV2 |
| Salix glauca ssp. glauca var. villosa | Salix nudescens Rydb. | SANU7 |
| Salix glauca ssp. glauca var. villosa | Salix pseudolapponum von Seem. | SAPS4 |
| Salix glauca ssp. glauca var. villosa | Salix pseudolapponum von Seem. var. kenosha L. Kelso | SAPSK |
| Salix glauca ssp. glauca var. villosa | Salix pseudolapponum von Seem. var. subincurva E.H. Kelso | SAPSS |
| Salix glauca ssp. glauca var. villosa | Salix subcordata Anderss. | SASU10 |
| Salix glauca ssp. glauca var. villosa | Salix villosa D. Don ex Hook. | SAVI10 |
| Salix glauca ssp. glauca var. villosa | Salix wolfii Bebb var. pseudolapponum (von Seem.) M.E. Jones | SAWOP |
| Salix glauca ssp. glauca var. villosa | Salix wyomingensis Rydb. | SAWY |
| Salix gooddingii | Salix gooddingii Ball var. vallicola (Dudley) Ball | SAGOV3 |
| Salix gooddingii | Salix gooddingii Ball var. variabilis Ball | SAGOV |
| Salix gooddingii | Salix nigra Marsh. var. vallicola Dudley | SANIV |
| Salix gooddingii | Salix vallicola (Dudley) Britt. & Shafer | SAVA6 |
| Salix hastata | Salix farriae Ball var. walpolei Coville & Ball | SAFAW |
| Salix hastata | Salix hastata L. ssp. subintegrifolia (Flod.) Flod. | SAHAS |
| Salix hastata | Salix hastata L. var. subintegrifolia Flod. | SAHAS2 |
| Salix hastata | Salix walpolei (Coville & Ball) Ball | SAWA4 |
| Salix hookeriana | Salix amplifolia Coville | SAAM8 |
| Salix hookeriana | Salix hookeriana Barratt ex Hook. var. laurifolia J.K. Henry | SAHOL |
| Salix hookeriana | Salix hookeriana Barratt ex Hook. var. tomentosa J.K. Henry ex Schneid. | SAHOT |
| Salix hookeriana | Salix piperi Bebb | SAPI |
| Salix humboldtiana | Salix chilensis Molina | SACH9 |
| Salix humboldtiana | Salix humboldtiana Willd. var. fastigiata Andr | SAHUF |
| Salix humilis var. humilis | Salix conifera Muhl., non Wangenh. | SACO20 |
| Salix humilis var. humilis | Salix humilis Marsh. var. angustifolia (Barratt) Anderss. | SAHUA |
| Salix humilis var. humilis | Salix humilis Marsh. var. grandifolia (Barratt) Anderss. | SAHUG |
| Salix humilis var. humilis | Salix humilis Marsh. var. hyporhysa Fern. | SAHUH2 |
| Salix humilis var. humilis | Salix humilis Marsh. var. keweenawensis Farw. | SAHUK |
| Salix humilis var. humilis | Salix humilis Marsh. var. rigidiuscula (Anderss.) B.L. Robins. & Fern. | SAHUR |
| Salix humilis var. humilis | Salix muehlenbergiana Willd. var. angustifolia Barratt | SAMUA |
| Salix humilis var. humilis | Salix muehlenbergiana Willd. var. grandifolia Barratt | SAMUG |
| Salix humilis var. humilis | Salix tristis Ait. var. glabrata (Anderss.) Anderss. | SATRG |
| Salix humilis var. tristis | Salix alpina Walt. | SAAL13 |
| Salix humilis var. tristis | Salix humilis Marsh. var. microphylla (Anderss.) Fern. | SAHUM |
| Salix humilis var. tristis | Salix longirostris Michx. | SALO8 |
| Salix humilis var. tristis | Salix muehlenbergiana Willd. | SAMU5 |
| Salix humilis var. tristis | Salix occidentalis Walt. | SAOC8 |
| Salix humilis var. tristis | Salix recurvata Pursh | SARE16 |
| Salix humilis var. tristis | Salix tristis Ait. | SATR2 |
| Salix humilis var. tristis | Salix tristis Ait. var. longifolia Anderss. | SATRL |
| Salix humilis var. tristis | Salix tristis Ait. var. microphylla Anderss. | SATRM |
| Salix humilis var. tristis | Salix tristis Ait. var. momadelphia Barratt | SATRM2 |
| Salix interior | Salix exigua Nutt. ssp. interior (Rowlee) Cronq. | SAEXI |
| Salix interior | Salix exigua Nutt. var. exterior (Fern.) C.F. Reed | SAEXE |
| Salix interior | Salix exigua Nutt. var. pedicellata (Anderss.) Cronq. | SAEXP2 |
| Salix interior | Salix exigua Nutt. var. sericans (Nees) Dorn | SAEXS3 |
| Salix interior | Salix fluviatilis Nutt. var. sericans (Nees) Boivin | SAFLS2 |
| Salix interior | Salix interior Rowlee var. exterior Fern. | SAINE |
| Salix interior | Salix interior Rowlee var. pedicellata (Anderss.) Ball | SAINP |
| Salix interior | Salix interior Rowlee var. wheeleri Rowlee | SAINW |
| Salix interior | Salix longifolia Muhl. var. interior (Rowlee) M.E. Jones | SALOI |
| Salix interior | Salix longifolia Muhl. var. pedicellata Anderss. | SALOP2 |
| Salix interior | Salix longifolia Muhl. var. sericans Nees | SALOS |
| Salix interior | Salix longifolia Muhl. var. wheeleri (Rowlee) Schneid. | SALOW2 |
| Salix interior | Salix longifolia Muhl., non Lam. | SALO9 |
| Salix interior | Salix rubra Richards., non Huds. | SARU9 |
| Salix interior | Salix wheeleri (Rowlee) Rydb. | SAWH |
| Salix jepsonii | Salix pellita (Anderss.) Anderss. var. angustifolia (Bebb) Boivin | SAPEA3 |
| Salix jepsonii | Salix sitchensis Sanson ex Bong. var. angustifolia Bebb | SASIA |
| Salix laevigata | Salix bonplandiana Kunth var. laevigata (Bebb) Dorn | SABOL |
| Salix laevigata | Salix congesta (Bebb ex Rothrock) J.T. Howell | SACO16 |
| Salix laevigata | Salix laevigata Bebb var. angustifolia Bebb ex Rothrock | SALAA |
| Salix laevigata | Salix laevigata Bebb var. araquipa (Jepson) Ball | SALAA2 |
| Salix laevigata | Salix laevigata Bebb var. congesta Bebb ex Rothrock | SALAC3 |
| Salix lasiolepis var. bigelovii | Salix bigelovii Torr. | SABI5 |
| Salix lasiolepis var. bigelovii | Salix franciscana von Seem. | SAFR6 |
| Salix lasiolepis var. lasiolepis | Salix bakeri von Seem. | SABA11 |
| Salix lasiolepis var. lasiolepis | Salix boiseana A. Nels. | SABO6 |
| Salix lasiolepis var. lasiolepis | Salix lasiolepis Benth. var. bakeri (von Seem.) Ball | SALAB2 |
| Salix lasiolepis var. lasiolepis | Salix lasiolepis Benth. var. bracelinae Ball | SALAB3 |
| Salix lasiolepis var. lasiolepis | Salix lasiolepis Benth. var. fallax Bebb | SALAF |
| Salix lasiolepis var. lasiolepis | Salix lasiolepis Benth. var. nivaria Jepson | SALAN |
| Salix lasiolepis var. lasiolepis | Salix lasiolepis Benth. var. sandbergii (Rydb.) Ball | SALAS |
| Salix lasiolepis var. lasiolepis | Salix lutea Nutt. var. nivaria Jepson | SALUN |
| Salix lasiolepis var. lasiolepis | Salix sandbergii Rydb. | SASA12 |
| Salix lasiolepis var. lasiolepis | Salix suksdorfii Gandog. | SASU13 |
| Salix lemmonii | Salix austinae Bebb | SAAU5 |
| Salix lemmonii | Salix lemmonii Bebb var. austinae (Bebb) Schneid. | SALEA |
| Salix lemmonii | Salix lemmonii Bebb var. macrostachya Bebb | SALEM |
| Salix lemmonii | Salix lemmonii Bebb var. melanopsis Bebb | SALEM2 |
| Salix lemmonii | Salix lemmonii Bebb var. sphaerostachya Bebb | SALES |
| Salix ligulifolia | Salix cordata Michx. var. ligulifolia (Ball) L. Kelso | SACOL |
| Salix ligulifolia | Salix eriocephala Michx. var. ligulifolia (Ball) Dorn | SAERL |
| Salix ligulifolia | Salix lutea Nutt. var. ligulifolia Ball | SALUL3 |
| Salix ligulifolia | Salix rigida Muhl. ssp. ligulifolia (Ball) E. Murr. | SARIL |
| Salix lucida ssp. caudata | Salix caudata (Nutt.) Heller | SACA38 |
| Salix lucida ssp. caudata | Salix caudata (Nutt.) Heller var. bryantiana Ball & Braceline | SACAB |
| Salix lucida ssp. caudata | Salix caudata (Nutt.) Heller var. parvifolia Ball | SACAP2 |
| Salix lucida ssp. caudata | Salix fendleriana Anderss. | SAFE2 |
| Salix lucida ssp. caudata | Salix lasiandra Benth. ssp. caudata (Nutt.) E. Murr. | SALAC4 |
| Salix lucida ssp. caudata | Salix lasiandra Benth. var. caudata (Nutt.) Sudworth | SALAC |
| Salix lucida ssp. caudata | Salix lasiandra Benth. var. fendleriana (Anderss.) Bebb | SALAF2 |
| Salix lucida ssp. caudata | Salix pentandra L. var. caudata Nutt. | SAPEC2 |
| Salix lucida ssp. lasiandra | Salix arguta Anderss. | SAAR17 |
| Salix lucida ssp. lasiandra | Salix arguta Anderss. var. erythrocoma (Anderss.) Anderss. | SAARE |
| Salix lucida ssp. lasiandra | Salix arguta Anderss. var. lasiandra (Benth.) Anderss. | SAARL3 |
| Salix lucida ssp. lasiandra | Salix lancifolia Anderss. | SALA17 |
| Salix lucida ssp. lasiandra | Salix lasiandra Benth. | SALA5 |
| Salix lucida ssp. lasiandra | Salix lasiandra Benth. var. abramsii Ball | SALAA3 |
| Salix lucida ssp. lasiandra | Salix lasiandra Benth. var. lancifolia (Anderss.) Bebb | SALAL5 |
| Salix lucida ssp. lasiandra | Salix lasiandra Benth. var. lyallii Sarg. | SALAL4 |
| Salix lucida ssp. lasiandra | Salix lasiandra Benth. var. macrophylla (Anderss.) Little | SALAM4 |
| Salix lucida ssp. lasiandra | Salix lasiandra Benth. var. recomponens Raup | SALAR2 |
| Salix lucida ssp. lasiandra | Salix lucida Muhl. var. macrophylla Anderss. | SALUM |
| Salix lucida ssp. lasiandra | Salix lyallii (Sarg.) Heller | SALY4 |
| Salix lucida ssp. lasiandra | Salix speciosa Nutt., non Host nec Hook. & Arn. | SASP8 |
| Salix lucida ssp. lucida | Salix arguta Anderss. var. hirtisquama (Anderss.) Anderss. | SAARH |
| Salix lucida ssp. lucida | Salix lucida Muhl. var. angustifolia (Anderss.) Anderss. | SALUA |
| Salix lucida ssp. lucida | Salix lucida Muhl. var. intonsa Fern. | SALUI |
| Salix lucida ssp. lucida | Salix lucida Muhl. var. latifolia (Anderss.) Anderss. | SALUL4 |
| Salix lucida ssp. lucida | Salix lucida Muhl. var. ovatifolia Anderss. | SALUO |
| Salix lucida ssp. lucida | Salix pentandra L. var. lucida (Muhl.) Kuntze | SAPEL |
| Salix lutea | Salix cordata Michx. var. denveriana L. Kelso | SACOD2 |
| Salix lutea | Salix cordata Michx. var. desolata (E.H. Kelso) L. Kelso | SACOD3 |
| Salix lutea | Salix cordata Michx. var. platyphylla (Ball) L. Kelso | SACOP2 |
| Salix lutea | Salix cordata Muhl. var. lutea (Nutt.) Bebb | SACOL2 |
| Salix lutea | Salix cordata Muhl. var. watsonii Bebb | SACOW |
| Salix lutea | Salix eriocephala Michx. var. famelica (Ball) Dorn | SAERF |
| Salix lutea | Salix eriocephala Michx. var. watsonii (Bebb) Dorn | SAERW |
| Salix lutea | Salix flava Rydb., non Schoepf | SAFL11 |
| Salix lutea | Salix lutea Nutt. var. desolata E.H. Kelso | SALUD |
| Salix lutea | Salix lutea Nutt. var. famelica Ball | SALUF |
| Salix lutea | Salix lutea Nutt. var. platyphylla Ball | SALUP |
| Salix lutea | Salix lutea Nutt. var. watsonii (Bebb) Jepson | SALUW |
| Salix lutea | Salix ormsbyensis von Seem. | SAOR6 |
| Salix lutea | Salix rigida Muhl. var. watsonii (Bebb) Cronq. | SARIW |
| Salix lutea | Salix watsonii (Bebb) Rydb. | SAWA6 |
| Salix melanopsis | Salix bolanderiana Rowlee | SABO5 |
| Salix melanopsis | Salix exigua Nutt. ssp. melanopsis (Nutt.) Cronq. | SAEXM |
| Salix melanopsis | Salix exigua Nutt. var. gracilipes (Ball) Cronq. | SAEXG |
| Salix melanopsis | Salix exigua Nutt. var. tenerrima (Henderson) Schneid. | SAEXT |
| Salix melanopsis | Salix fluviatilis auct. non Nutt. [misapplied] | SAFL14 |
| Salix melanopsis | Salix fluviatilis Nutt. var. tenerrima (Henderson) T.J. Howell | SAFLT |
| Salix melanopsis | Salix longifolia Muhl. var. tenerrima Henderson | SALOT |
| Salix melanopsis | Salix melanopsis Nutt. var. bolanderiana (Rowlee) Schneid. | SAMEB |
| Salix melanopsis | Salix melanopsis Nutt. var. gracilipes Ball | SAMEG |
| Salix melanopsis | Salix melanopsis Nutt. var. kronkheittii L. Kelso | SAMEK |
| Salix melanopsis | Salix melanopsis Nutt. var. tenerrima (Henderson) Ball | SAMET |
| Salix melanopsis | Salix parksiana Ball | SAPA4 |
| Salix melanopsis | Salix sessilifolia Nutt. var. vancouverensis Brayshaw | SASEV |
| Salix melanopsis | Salix tenerrima (Henderson) Heller | SATE7 |
| Salix monochroma | Salix eriocephala Michx. var. monochroma (Ball) Dorn | SAERM |
| Salix monticola | Salix amelanchieroides L. Kelso | SAAM7 |
| Salix monticola | Salix barclayi Anderss. var. cochetopiana L. Kelso | SABAC2 |
| Salix monticola | Salix barclayi Anderss. var. neomexicana (E.H. Kelso) L. Kelso | SABAN |
| Salix monticola | Salix barclayi Anderss. var. padophylla (Rydb.) L. Kelso | SABAP3 |
| Salix monticola | Salix barclayi Anderss. var. resurrectionis L. Kelso | SABAR |
| Salix monticola | Salix barclayi Anderss. var. uncompahgre L. Kelso | SABAU |
| Salix monticola | Salix barclayi Anderss. var. veritomonticola L. Kelso | SABAV |
| Salix monticola | Salix cordata Michx. var. crux-aureae L. Kelso | SACOC4 |
| Salix monticola | Salix cordata Michx. var. monticola (Bebb) L. Kelso | SACOM3 |
| Salix monticola | Salix dissymetrica L. Kelso | SADI4 |
| Salix monticola | Salix monticola Bebb var. neomexicana E.H. Kelso | SAMON |
| Salix monticola | Salix padifolia Rydb., non Anderss. | SAPA19 |
| Salix monticola | Salix padophylla Rydb. | SAPA20 |
| Salix monticola | Salix pseudomonticola Ball var. padophylla (Rydb.) Ball | SAPSP |
| Salix monticola | Salix sawatchicola L. Kelso | SASA11 |
| Salix myricoides var. albovestita | Salix glaucophylla Bebb (Bebb) var. albovestita Ball | SAGLA5 |
| Salix myricoides var. albovestita | Salix glaucophylloides Fern. var. albovestita (Ball) Fern. | SAGLA7 |
| Salix myricoides var. myricoides | Salix cordata Muhl. var. glaucophylla Bebb | SACOG |
| Salix myricoides var. myricoides | Salix cordata Muhl. var. myricoides (Muhl.) Carey | SACOM4 |
| Salix myricoides var. myricoides | Salix glaucophylla Bebb (Bebb) var. angustifolia Bebb | SAGLA6 |
| Salix myricoides var. myricoides | Salix glaucophylla Bebb (Bebb) var. brevifolia Bebb | SAGLB |
| Salix myricoides var. myricoides | Salix glaucophylla Bebb (Bebb) var. latifolia Bebb | SAGLL |
| Salix myricoides var. myricoides | Salix glaucophylla Bebb (Bebb), non Bess. nec Anderss. | SAGL11 |
| Salix myricoides var. myricoides | Salix glaucophylloides Fern. | SAGL2 |
| Salix myricoides var. myricoides | Salix glaucophylloides Fern. var. brevifolia (Bebb) Ball | SAGLB2 |
| Salix myricoides var. myricoides | Salix glaucophylloides Fern. var. glaucophylla (Bebb) Schneid. | SAGLG6 |
| Salix myrsinites | Salix myrsinites L. var. jacquiniana (Willd.) W. D. J. Koch | SAMYJ2 |
| Salix myrtillifolia | Salix lingulata Anderss. | SALI3 |
| Salix myrtillifolia | Salix myrsinites L. var. curtiflora Anderss. | SAMYC5 |
| Salix myrtillifolia | Salix myrtillifolia Anderss. var. curtiflora (Anderss.) Bebb ex Rose | SAMYC6 |
| Salix myrtillifolia | Salix myrtillifolia Anderss. var. lingulata (Anderss.) Ball | SAMYL |
| Salix myrtillifolia | Salix novae-angliae Anderss. var. myrtillifolia (Anderss.) Anderss. | SANOM |
| Salix myrtillifolia | Salix novae-angliae Anderss. var. pseudocordata Anderss. | SANOP2 |
| Salix myrtillifolia | Salix pseudocordata (Anderss.) Rydb. | SAPS7 |
| Salix nigra | Salix ambigua Pursh, non Ehrh. | SAAM9 |
| Salix nigra | Salix denudata Raf. | SADE8 |
| Salix nigra | Salix dubia Trautv. | SADU2 |
| Salix nigra | Salix falcata Pursh | SAFA7 |
| Salix nigra | Salix flavovirens Hornem. | SAFL12 |
| Salix nigra | Salix ligustrina Michx. f. | SALI4 |
| Salix nigra | Salix ludoviciana Raf. | SALU4 |
| Salix nigra | Salix nigra Marsh. var. altissima Sarg. | SANIA2 |
| Salix nigra | Salix nigra Marsh. var. brevifolia Anderss. | SANIB |
| Salix nigra | Salix nigra Marsh. var. brevijulis Anderss. | SANIB2 |
| Salix nigra | Salix nigra Marsh. var. falcata (Pursh) Torr. | SANIF2 |
| Salix nigra | Salix nigra Marsh. var. lindheimeri Schneid. | SANIL2 |
| Salix nigra | Salix nigra Marsh. var. longifolia Anderss. | SANIL3 |
| Salix nigra | Salix nigra Marsh. var. marginata (C.F.H. Wimmer ex Anderss.) Anderss. | SANIM2 |
| Salix nigra | Salix purshiana Spreng. | SAPU9 |
| Salix niphoclada | Salix brachycarpa Nutt. ssp. fullertonensis (Schneid.) A.& D. L?ve | SABRF3 |
| Salix niphoclada | Salix brachycarpa Nutt. ssp. niphoclada (Rydb.) Argus | SABRN |
| Salix niphoclada | Salix brachycarpa Nutt. var. fullertonensis (Schneid.) Argus | SABRF4 |
| Salix niphoclada | Salix brachycarpa Nutt. var. mexiae Ball | SABRM |
| Salix niphoclada | Salix fullertonensis Schneid. | SAFU3 |
| Salix niphoclada | Salix glauca L. var. niphoclada (Rydb.) Wiggins | SAGLN |
| Salix niphoclada | Salix muriei Hult | SAMU4 |
| Salix niphoclada | Salix niphoclada Rydb. var. fullertonensis (Schneid.) Raup | SANIF |
| Salix niphoclada | Salix niphoclada Rydb. var. mexiae (Ball) Hult | SANIM |
| Salix niphoclada | Salix niphoclada Rydb. var. muriei (Hult?n) Raup | SANIM3 |
| Salix nivalis | Salix nivalis Hook. var. saximontana (Rydb.) Schneid. | SANIS |
| Salix nivalis | Salix reticulata L. ssp. nivalis (Hook.) A.& D. L?ve & Kapoor | SAREN |
| Salix nivalis | Salix reticulata L. var. nana (Hook.) Anderss. | SAREN2 |
| Salix nivalis | Salix reticulata L. var. nivalis (Hook.) Anderss. | SAREN3 |
| Salix nivalis | Salix reticulata L. var. saximontana (Rydb.) L. Kelso | SARES |
| Salix nivalis | Salix saximontana Rydb. | SASA13 |
| Salix nivalis | Salix venusta Anderss. | SAVE8 |
| Salix nivalis | Salix vestita Pursh var. nana Hook. | SAVEN |
| Salix nummularia | Salix nummularia Anderss. ssp. tundricola (Schljak.) A.& D. L?ve | SANUT |
| Salix nummularia | Salix tundricola Schljak. | SATU3 |
| Salix orestera | Salix commutata Bebb var. rubicunda Jepson | SACOR4 |
| Salix orestera | Salix glauca L. ssp. orestera (Schneid.) Youngberg | SAGLO |
| Salix orestera | Salix glauca L. var. orestera (Schneid.) Jepson | SAGLO2 |
| Salix ovalifolia var. arctolitoralis | Salix arctolitoralis Hult | SAAR15 |
| Salix ovalifolia var. cyclophylla | Salix cyclophylla Rydb. | SACY6 |
| Salix ovalifolia var. cyclophylla | Salix rotundata Rydb. ex Macoun | SARO7 |
| Salix ovalifolia var. glacialis | Salix glacialis Anderss. | SAGL9 |
| Salix ovalifolia var. ovalifolia | Salix flagellaris Hult | SAFL15 |
| Salix ovalifolia var. ovalifolia | Salix ovalifolia Trautv. var. camdensis Schneid. | SAOVC2 |
| Salix ovalifolia var. ovalifolia | Salix unalaschensis Cham. | SAUN3 |
| Salix pedicellaris | Salix fuscescens Anderss. var. hebecarpa Fern. | SAFUH |
| Salix pedicellaris | Salix hebecarpa (Fern.) Fern. | SAHE4 |
| Salix pedicellaris | Salix myrtilloides L. var. hypoglauca (Fern.) Ball | SAMYH |
| Salix pedicellaris | Salix myrtilloides L. var. pedicellaris (Pursh) Anderss. | SAMYP3 |
| Salix pedicellaris | Salix pedicellaris Pursh var. hypoglauca Fern. | SAPEH |
| Salix pedicellaris | Salix pedicellaris Pursh var. tenuescens Fern. | SAPET2 |
| Salix pellita | Salix chlorophylla Anderss. var. pellita Anderss. | SACHP |
| Salix pellita | Salix obovata Pursh | SAOB3 |
| Salix pellita | Salix seriocarpa Buser | SASE12 |
| Salix pellita | Salix sitchensis Sanson ex Bong. var. pellita (Anderss.) Jepson | SASIP |
| Salix petiolaris | Salix ?subsericea (Anderss.) Schneid. | SASU3 |
| Salix petiolaris | Salix gracilis Anderss. | SAGR13 |
| Salix petiolaris | Salix gracilis Anderss. var. rosmarinoides Anderss. | SAGRR |
| Salix petiolaris | Salix gracilis Anderss. var. textoris Fern. | SAGRT2 |
| Salix petiolaris | Salix neoforbesii Toepffer | SANE8 |
| Salix petiolaris | Salix petiolaris Sm. var. angustifolia Anderss. | SAPEA2 |
| Salix petiolaris | Salix petiolaris Sm. var. gracilis (Anderss.) Anderss. | SAPEG |
| Salix petiolaris | Salix petiolaris Sm. var. rosmarinoides (Anderss.) Schneid. | SAPER |
| Salix petiolaris | Salix petiolaris Sm. var. subsericea Anderss. | SAPES |
| Salix petiolaris | Salix sericea Marsh. var. subsericea (Anderss.) Rydb. | SASES |
| Salix petrophila | Salix arctica Pallas ssp. petraea (Anderss.) A.& D. L?ve & Kapoor | SAARP |
| Salix petrophila | Salix arctica Pallas var. caespitosa (Kennedy) L. Kelso | SAARC2 |
| Salix petrophila | Salix arctica Pallas var. graminifolia (E.H. Kelso) L. Kelso | SAARG |
| Salix petrophila | Salix arctica Pallas var. petraea (Anderss.) Bebb | SAARP5 |
| Salix petrophila | Salix arctica Pallas var. petrophila (Rydb.) L. Kelso | SAARP4 |
| Salix petrophila | Salix brownei (Anderss.) Bebb var. petraea (Anderss.) Bebb | SABRP4 |
| Salix petrophila | Salix caespitosa Kennedy | SACA30 |
| Salix petrophila | Salix petrophila Rydb. var. caespitosa (Kennedy) Schneid. | SAPEC |
| Salix phlebophylla | Salix anglorum Cham. | SAAN8 |
| Salix phlebophylla | Salix paleoneura Rydb. | SAPA23 |
| Salix planifolia ssp. planifolia | Salix chlorophylla Anderss. | SACH12 |
| Salix planifolia ssp. planifolia | Salix chlorophylla Anderss. var. monica (Bebb) Flod. | SACHM |
| Salix planifolia ssp. planifolia | Salix chlorophylla Anderss. var. nelsonii (Ball) Flod. | SACHN |
| Salix planifolia ssp. planifolia | Salix chlorophylla Anderss. var. pychnocarpa (Anderss.) Anderss. | SACHP2 |
| Salix planifolia ssp. planifolia | Salix monica Bebb | SAMO10 |
| Salix planifolia ssp. planifolia | Salix nelsonii Ball | SANE7 |
| Salix planifolia ssp. planifolia | Salix pennata Ball | SAPE17 |
| Salix planifolia ssp. planifolia | Salix phylicifolia L. ssp. planifolia (Pursh) Hiitonen | SAPHP4 |
| Salix planifolia ssp. planifolia | Salix phylicifolia L. var. monica (Bebb) Jepson | SAPHM |
| Salix planifolia ssp. planifolia | Salix phylicifolia L. var. pennata (Ball) Cronq. | SAPHP2 |
| Salix planifolia ssp. planifolia | Salix planifolia Pursh var. monica (Bebb) Schneid. | SAPLM |
| Salix planifolia ssp. planifolia | Salix planifolia Pursh var. nelsonii (Ball) Ball ex E.C. Sm. | SAPLN |
| Salix planifolia ssp. planifolia | Salix planifolia Pursh var. pennata (Ball) Ball ex Dutilly, Lepage & Daman | SAPLP3 |
| Salix planifolia ssp. planifolia | Salix pychnocarpa Anderss. | SAPY3 |
| Salix polaris | Salix polaris Wahlenb. ssp. pseudopolaris (Flod.) Hult | SAPOP |
| Salix polaris | Salix polaris Wahlenb. var. glabrata Hult | SAPOG |
| Salix polaris | Salix polaris Wahlenb. var. selwynensis Raup | SAPOS |
| Salix polaris | Salix pseudopolaris Flod. | SAPS6 |
| Salix prolixa | Salix cordata Muhl. var. mackenzieana Hook. | SACOM5 |
| Salix prolixa | Salix eriocephala Michx. ssp. mackenzieana (Hook.) Dorn | SAERM2 |
| Salix prolixa | Salix eriocephala Michx. var. mackenzieana (Hook.) Dorn | SAERM3 |
| Salix prolixa | Salix mackenzieana (Hook.) Barratt ex Anderss. | SAMA16 |
| Salix prolixa | Salix mackenzieana (Hook.) Barratt ex Anderss. var. macrogemma Ball | SAMAM3 |
| Salix prolixa | Salix rigida Muhl. ssp. mackenzieana (Hook.) E. Murr. | SARIM3 |
| Salix prolixa | Salix rigida Muhl. var. mackenzieana (Hook.) Cronq. | SARIM4 |
| Salix prolixa | Salix rigida Muhl. var. macrogemma (Ball) Cronq. | SARIM5 |
| Salix pseudomonticola | Salix barclayi Anderss. var. pseudomonticola (Ball) L. Kelso | SABAP2 |
| Salix pseudomyrsinites | Salix myrtillifolia Anderss. var. cordata (Anderss.) Dorn | SAMYC |
| Salix pseudomyrsinites | Salix myrtillifolia Anderss. var. pseudomyrsinites (Anderss.) Ball ex Hult | SAMYP4 |
| Salix pseudomyrsinites | Salix novae-angliae Anderss. var. pseudomyrsinites (Anderss.) Anderss. | SANOP4 |
| Salix pseudomyrsinites | Salix novae-angliae auct. non Anderss. [misapplied] | SANO2 |
| Salix pseudomyrsinites | Salix pseudocordata (Anderss.) Rydb. var. cordata (Anderss.) Ball | SAPSC |
| Salix pulchra | Salix arbusculoides Anderss. var. glabra (Anderss.) Anderss. ex Schneid. | SAARG2 |
| Salix pulchra | Salix barclayi Anderss. var. hebecarpa Anderss. | SABAH |
| Salix pulchra | Salix fulcrata Anderss. var. subglauca Anderss. | SAFUS |
| Salix pulchra | Salix phylicifolia L. ssp. pulchra (Cham.) Hult | SAPHP3 |
| Salix pulchra | Salix phylicifolia L. var. subglauca (Anderss.) Boivin | SAPHS |
| Salix pulchra | Salix phylicoides Anderss. | SAPH4 |
| Salix pulchra | Salix planifolia Pursh ssp. pulchra (Cham.) Argus | SAPLP |
| Salix pulchra | Salix planifolia Pursh var. yukonensis (Schneid.) Argus | SAPLY |
| Salix pulchra | Salix pulchra Cham. var. looffiae Ball | SAPUL |
| Salix pulchra | Salix pulchra Cham. var. palmeri Ball | SAPUP4 |
| Salix pulchra | Salix pulchra Cham. var. yukonensis Schneid. | SAPUY |
| Salix purpurea | Salix purpurea L. | SAPUG2 |
| Salix purpurea | Salix purpurea L. var. nana Dieck | SAPUN3 |
| Salix pyrifolia | Salix balsamifera (Hook.) Barratt ex Anderss. | SABA12 |
| Salix pyrifolia | Salix balsamifera (Hook.) Barratt ex Anderss. var. alpestris Bebb | SABAA3 |
| Salix pyrifolia | Salix balsamifera (Hook.) Barratt ex Anderss. var. lanceolata Bebb | SABAL4 |
| Salix pyrifolia | Salix balsamifera (Hook.) Barratt ex Anderss. var. vegeta Bebb | SABAV2 |
| Salix pyrifolia | Salix cordata Muhl. var. balsamifera Hook. | SACOB |
| Salix pyrifolia | Salix pyrifolia Anderss. var. lanceolata (Bebb) Fern. | SAPYL |
| Salix reticulata ssp. reticulata | Salix orbicularis Anderss. | SAOR7 |
| Salix reticulata ssp. reticulata | Salix reticulata L. ssp. orbicularis (Anderss.) Flod. | SAREO4 |
| Salix reticulata ssp. reticulata | Salix reticulata L. var. gigantifolia Ball | SAREG2 |
| Salix reticulata ssp. reticulata | Salix reticulata L. var. glabra Trautv. | SAREG3 |
| Salix reticulata ssp. reticulata | Salix reticulata L. var. orbicularis (Anderss.) Komarov | SAREO3 |
| Salix reticulata ssp. reticulata | Salix reticulata L. var. semicalva Fern. | SARES2 |
| Salix richardsonii | Salix lanata L. ssp. richardsonii (Hook.) Skvort. | SALAR |
| Salix richardsonii | Salix richardsonii Hook. var. mckeandii Polunin | SARIM2 |
| Salix rotundifolia ssp. dodgeana | Salix dodgeana Rydb. | SADO8 |
| Salix rotundifolia ssp. dodgeana | Salix dodgeana Rydb. var. subrariflora (L. Kelso) L. Kelso | SADOS |
| Salix rotundifolia ssp. dodgeana | Salix rotundifolia Trautv. var. dodgeana (Rydb.) E. Murr. | SAROD2 |
| Salix rotundifolia ssp. rotundifolia | Salix behringica von Seem. | SABE7 |
| Salix rotundifolia ssp. rotundifolia | Salix leiocarpa (Cham.) Coville | SALE6 |
| Salix rotundifolia ssp. rotundifolia | Salix polaris Wahlenb. var. leiocarpa Cham. | SAPOL |
| Salix scouleriana | Salix brachystachys Benth. | SABR16 |
| Salix scouleriana | Salix brachystachys Benth. var. scouleriana (Barratt ex Hook.) Anderss. | SABRS2 |
| Salix scouleriana | Salix capreoides Anderss. | SACA39 |
| Salix scouleriana | Salix flavescens Nutt. | SAFL13 |
| Salix scouleriana | Salix flavescens Nutt. var. capreoides (Anderss.) Bebb | SAFLC2 |
| Salix scouleriana | Salix flavescens Nutt. var. scouleriana (Barratt ex Hook.) Bebb | SAFLS4 |
| Salix scouleriana | Salix nuttallii Sarg. | SANU8 |
| Salix scouleriana | Salix nuttallii Sarg. var. capreoides (Anderss.) Sarg. | SANUC |
| Salix scouleriana | Salix scouleriana Barratt ex Hook. var. brachystachys (Benth.) M.E. Jones | SASCB |
| Salix scouleriana | Salix scouleriana Barratt ex Hook. var. coetanea Ball | SASCC |
| Salix scouleriana | Salix scouleriana Barratt ex Hook. var. crassijulis (Anderss.) Schneid. | SASCC2 |
| Salix scouleriana | Salix scouleriana Barratt ex Hook. var. flavescens (Nutt.) J.K. Henry | SASCF |
| Salix scouleriana | Salix scouleriana Barratt ex Hook. var. poikila Schneid. | SASCP |
| Salix scouleriana | Salix scouleriana Barratt ex Hook. var. thompsonii Ball | SASCT |
| Salix scouleriana | Salix stagnalis Nutt. | SAST9 |
| Salix sericea | Salix coactilis Fern. | SACO22 |
| Salix sericea | Salix grisea Willd. | SAGR14 |
| Salix sericea | Salix pensylvanica Forbes | SAPE21 |
| Salix sericea | Salix petiolaris Sm. var. grisea (Willd.) Torr. | SAPEG2 |
| Salix sericea | Salix petiolaris Sm. var. sericea (Marsh.) Anderss. | SAPES2 |
| Salix serissima | Salix arguta Anderss. var. alpigena Anderss. | SAARA3 |
| Salix serissima | Salix arguta Anderss. var. pallescens Anderss. | SAARP2 |
| Salix serissima | Salix lucida Muhl. var. serissima Bailey | SALUS |
| Salix sessilifolia | Salix exigua Nutt. var. sessilifolia (Nutt.) Dorn | SAEXS2 |
| Salix sessilifolia | Salix fluviatilis Nutt. | SAFL2 |
| Salix sessilifolia | Salix fluviatilis Nutt. var. sessilifolia (Nutt.) Scoggan | SAFLS3 |
| Salix sessilifolia | Salix longifolia Muhl. var. sessilifolia (Nutt.) M.E. Jones | SALOS2 |
| Salix sessilifolia | Salix macrostachya Nutt. | SAMA17 |
| Salix sessilifolia | Salix macrostachya Nutt. var. cusickii Rowlee | SAMAC2 |
| Salix sessilifolia | Salix sessilifolia Nutt. var. villosa Anderss. | SASEV2 |
| Salix setchelliana | Salix aliena Flod. | SAAL10 |
| Salix sitchensis | Salix coulteri Anderss. | SACO4 |
| Salix sitchensis | Salix cuneata Nutt. | SACU8 |
| Salix sitchensis | Salix sitchensis Sanson ex Bong. var. congesta (Anderss.) Anderss. | SASIC |
| Salix sitchensis | Salix sitchensis Sanson ex Bong. var. denudata (Anderss.) Anderss. | SASID |
| Salix sitchensis | Salix sitchensis Sanson ex Bong. var. parviflora (Jepson) Jepson | SASIP2 |
| Salix sitchensis | Salix sitchensis Sanson ex Bong. var. ralphiana (Jepson) Jepson | SASIR |
| Salix sphenophylla | Salix cuneata Turcz. ex Ledeb., non Nutt. | SACU5 |
| Salix sphenophylla | Salix sphenophylla Skvort. ssp. pseudotorulosa Skvort. | SASPP |
| Salix taxifolia | Salix taxifolia Kunth var. lejocarpa Anderss. | SATAL |
| Salix taxifolia | Salix taxifolia Kunth var. limitanea I.M. Johnston | SATAL2 |
| Salix taxifolia | Salix taxifolia Kunth var. seriocarpa Anderss. | SATAS |
| Salix tweedyi | Salix barrattiana Hook. var. tweedyi Bebb ex Rose | SABAT2 |
| Salix tweedyi | Salix rotundifolia Nutt., non Trautv. | SARO8 |
| Salix udensis | Salix sachalinensis F. Schmidt | SASA21 |
| Salix uva-ursi | Salix arbuscula L. var. labradorica (Anderss.) Anderss. | SAARL2 |
| Salix uva-ursi | Salix cutleri Tuckerman | SACU6 |
| Salix uva-ursi | Salix cutleri Tuckerman var. labradorica (Anderss.) Anderss. | SACUL |
| Salix uva-ursi | Salix ivigtutiana Lundstr. | SAIV |
| Salix uva-ursi | Salix myrsinites L. var. parvifolia Lange | SAMYP2 |
| Salix variegata | Salix bockii Seemen | SABO8 |
| Salix vestita | Salix fernaldii Blank. | SAFE3 |
| Salix vestita | Salix leiolepis Fern. | SALE7 |
| Salix vestita | Salix reticulata L. var. vestita (Pursh) Anderss. | SAREV |
| Salix vestita | Salix vestita Pursh ssp. leiolepis (Fern.) Argus | SAVEL |
| Salix vestita | Salix vestita Pursh var. erecta Anderss. | SAVEE |
| Salix vestita | Salix vestita Pursh var. humilior Anderss. | SAVEH |
| Salix vestita | Salix vestita Pursh var. psilophylla Fern. & St. John | SAVEP |
| Salix wolfii | Salix idahoensis (Ball) Rydb. | SAID2 |
| Salix wolfii | Salix wolfii Bebb ssp. idahoensis (Ball) E. Murr. | SAWOI |
| Salix wolfii | Salix wolfii Bebb var. idahoensis Ball | SAWOI2 |
| sandbar willow | Salix interior Rowlee | SAIN3 |
| satiny willow | Salix pellita (Anderss.) Anderss. | SAPE3 |
| Scouler's willow | Salix scouleriana Barratt ex Hook. | SASC |
| Seringe willow | Salix ?seringeana Gaudin | SASE20 |
| Setchell's willow | Salix setchelliana Ball | SASE4 |
| sharp-stipule willow | Salix ?mollissima Ehrh. | SAMOH |
| shining willow | Salix lucida Muhl. | SALU |
| shining willow | Salix lucida Muhl. ssp. lucida | SALUL2 |
| shortfruit willow | Salix brachycarpa Nutt. | SABR |
| shortfruit willow | Salix brachycarpa Nutt. var. brachycarpa | SABRB7 |
| Sierra willow | Salix orestera Schneid. | SAOR |
| silky willow | Salix sericea Marsh. | SASE |
| silky-leaf osier | Salix ?smithiana Willd. (pro sp.) [cinerea ? viminalis] | SASM2 |
| Simon poplar | Populus simonii Carr. [excluded] | POSI11 |
| Sitka willow | Salix sitchensis Sanson ex Bong. | SASI2 |
| skeletonleaf willow | Salix phlebophylla Anderss. | SAPH |
| snow willow | Salix nivalis Hook. | SANI8 |
| snowbed willow | Salix herbacea L. | SAHE2 |
| sprouting leaf willow | Salix stolonifera Coville | SAST2 |
| strapleaf willow | Salix ligulifolia (Ball) Ball ex Schneid. | SALI |
| swamp cottonwood | Populus heterophylla L. | POHE4 |
| tealeaf willow | Salix pulchra Cham. | SAPU15 |
| timberline willow | Salix rotundifolia Trautv. ssp. dodgeana (Rydb.) Argus | SAROD |
| Tracy's willow | Salix tracyi Ball | SATR |
| Tweedy's willow | Salix tweedyi (Bebb ex Rose) Ball | SATW |
| undergreen willow | Salix commutata Bebb | SACO2 |
| wedgeleaf willow | Salix sphenophylla Skvort. | SASP2 |
| weeping willow | Salix ?sepulcralis Simonkai [alba ? ?pendulina] | SASE10 |
| white poplar | Populus alba L. | POAL7 |
| white willow | Salix alba L. | SAAL2 |
| willow | Salix bicolor Fries | SABI8 |
| willow | Salix gilgiana Fries | SAGI3 |
| willow | Salix L. | SALIX |
| Wisconsin weeping willow | Salix ?pendulina Wenderoth [fragilis ? ?sepulcralis] | SAPE12 |
| Wolf's willow | Salix wolfii Bebb | SAWO |
| woolly willow | Salix calcicola Fern. & Wieg. | SACA37 |
| yellow willow | Salix lutea Nutt. | SALU2 |
| yewleaf willow | Salix taxifolia Kunth | SATA |