| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| SAPS4 | Salix pseudolapponum von Seem. | Salix glauca ssp. glauca var. villosa | Salicaceae
|
| SAPSP | Salix pseudomonticola Ball var. padophylla (Rydb.) Ball | Salix monticola | Salicaceae
|
| SAPS | Salix pseudomonticola Ball | false mountain willow | Salicaceae
|
| SAPSA2 | Salix pseudomyrsinites Anderss. var. aequalis (Anderss.) Anderss. ex Ball | Salix boothii | Salicaceae
|
| SAPS8 | Salix pseudomyrsinites Anderss. | firmleaf willow | Salicaceae
|
| SAPS5 | Salix pseudomyrsinites auct. non Anderss. | Salix boothii | Salicaceae
|
| SAPS6 | Salix pseudopolaris Flod. | Salix polaris | Salicaceae
|
| SAPUL | Salix pulchra Cham. var. looffiae Ball | Salix pulchra | Salicaceae
|
| SAPUP4 | Salix pulchra Cham. var. palmeri Ball | Salix pulchra | Salicaceae
|
| SAPUY | Salix pulchra Cham. var. yukonensis Schneid. | Salix pulchra | Salicaceae
|
| SAPU15 | Salix pulchra Cham. | tealeaf willow | Salicaceae
|
| SAPU2 | Salix purpurea L. | purpleosier willow | Salicaceae
|
| SAPU9 | Salix purshiana Spreng. | Salix nigra | Salicaceae
|
| SAPY3 | Salix pychnocarpa Anderss. | Salix planifolia | Salicaceae
|
| SAPYL | Salix pyrifolia Anderss. var. lanceolata (Bebb) Fern. | Salix pyrifolia | Salicaceae
|
| SAPY | Salix pyrifolia Anderss. | balsam willow | Salicaceae
|
| SAPYH | Salix pyrolifolia Anderss. var. hoyeriana (Dieck) Dippel | Salix barclayi | Salicaceae
|
| SARE16 | Salix recurvata Pursh | Salix humilis var. tristis | Salicaceae
|
| SARE15 | Salix regelii Anderss. | Salix barclayi | Salicaceae
|
| SAREG | Salix reticulata L. ssp. glabellicarpa Argus | netleaf willow | Salicaceae
|
| SAREN | Salix reticulata L. ssp. nivalis (Hook.) A.& D. L�ve & Kapoor | Salix nivalis | Salicaceae
|
| SAREO4 | Salix reticulata L. ssp. orbicularis (Anderss.) Flod. | Salix reticulata ssp. reticulata | Salicaceae
|
| SARER | Salix reticulata L. ssp. reticulata | netleaf willow | Salicaceae
|
| SAREG2 | Salix reticulata L. var. gigantifolia Ball | Salix reticulata ssp. reticulata | Salicaceae
|
| SAREG3 | Salix reticulata L. var. glabra Trautv. | Salix reticulata ssp. reticulata | Salicaceae
|
| SAREN2 | Salix reticulata L. var. nana (Hook.) Anderss. | Salix nivalis | Salicaceae
|
| SAREN3 | Salix reticulata L. var. nivalis (Hook.) Anderss. | Salix nivalis | Salicaceae
|
| SAREO3 | Salix reticulata L. var. orbicularis (Anderss.) Komarov | Salix reticulata ssp. reticulata | Salicaceae
|
| SARES | Salix reticulata L. var. saximontana (Rydb.) L. Kelso | Salix nivalis | Salicaceae
|
| SARES2 | Salix reticulata L. var. semicalva Fern. | Salix reticulata ssp. reticulata | Salicaceae
|
| SAREV | Salix reticulata L. var. vestita (Pursh) Anderss. | Salix vestita | Salicaceae
|
| SARE2 | Salix reticulata L. | netleaf willow | Salicaceae
|
| SARIM | Salix richardsonii Hook. var. macouniana Bebb | Salix calcicola | Salicaceae
|
| SARIM2 | Salix richardsonii Hook. var. mckeandii Polunin | Salix richardsonii | Salicaceae
|
| SARI4 | Salix richardsonii Hook. | Richardson's willow | Salicaceae
|
| SARIL | Salix rigida Muhl. ssp. ligulifolia (Ball) E. Murr. | Salix ligulifolia | Salicaceae
|
| SARIM3 | Salix rigida Muhl. ssp. mackenzieana (Hook.) E. Murr. | Salix prolixa | Salicaceae
|
| SARIA | Salix rigida Muhl. var. angustata (Pursh) Fern. | Salix eriocephala | Salicaceae
|
| SARIM4 | Salix rigida Muhl. var. mackenzieana (Hook.) Cronq. | Salix prolixa | Salicaceae
|
| SARIM5 | Salix rigida Muhl. var. macrogemma (Ball) Cronq. | Salix prolixa | Salicaceae
|
| SARIV | Salix rigida Muhl. var. vestita (Anderss.) Ball | Salix eriocephala | Salicaceae
|
| SARIW | Salix rigida Muhl. var. watsonii (Bebb) Cronq. | Salix lutea | Salicaceae
|
| SARI2 | Salix rigida Muhl. | Salix eriocephala | Salicaceae
|
| SAROC | Salix rostrata Richards. var. capreifolia Fern. | Salix bebbiana | Salicaceae
|
| SAROL | Salix rostrata Richards. var. luxurians Fern. | Salix bebbiana | Salicaceae
|
| SAROP | Salix rostrata Richards. var. perrostrata (Rydb.) Fern. | Salix bebbiana | Salicaceae
|
| SAROP2 | Salix rostrata Richards. var. projecta Fern. | Salix bebbiana | Salicaceae
|
| SARO6 | Salix rostrata Richards., non Thuill. | Salix bebbiana | Salicaceae
|
| SARO7 | Salix rotundata Rydb. ex Macoun | Salix ovalifolia var. cyclophylla | Salicaceae
|
| SAROD | Salix rotundifolia Trautv. ssp. dodgeana (Rydb.) Argus | timberline willow | Salicaceae
|
| SAROR | Salix rotundifolia Trautv. ssp. rotundifolia | least willow | Salicaceae
|
| SAROD2 | Salix rotundifolia Trautv. var. dodgeana (Rydb.) E. Murr. | Salix rotundifolia ssp. dodgeana | Salicaceae
|
| SARO8 | Salix rotundifolia Nutt., non Trautv. | Salix tweedyi | Salicaceae
|
| SARO2 | Salix rotundifolia Trautv. | least willow | Salicaceae
|
| SARU2 | Salix �rubella Bebb | | Salicaceae
|
| SARU3 | Salix �rubens Schrank (pro sp.) | hybrid crack willow | Salicaceae
|
| SARU9 | Salix rubra Richards., non Huds. | Salix interior | Salicaceae
|
| SASA16 | Salix salomonii hort. | Salix sepulcralis | Salicaceae
|
| SASA12 | Salix sandbergii Rydb. | Salix lasiolepis var. lasiolepis | Salicaceae
|
| SASA15 | Salix saskatchevana von Seem. | Salix arbusculoides | Salicaceae
|
| SASA11 | Salix sawatchicola L. Kelso | Salix monticola | Salicaceae
|
| SASA13 | Salix saximontana Rydb. | Salix nivalis | Salicaceae
|
| SASCB | Salix scouleriana Barratt ex Hook. var. brachystachys (Benth.) M.E. Jones | Salix scouleriana | Salicaceae
|
| SASCC | Salix scouleriana Barratt ex Hook. var. coetanea Ball | Salix scouleriana | Salicaceae
|
| SASCC2 | Salix scouleriana Barratt ex Hook. var. crassijulis (Anderss.) Schneid. | Salix scouleriana | Salicaceae
|
| SASCF | Salix scouleriana Barratt ex Hook. var. flavescens (Nutt.) J.K. Henry | Salix scouleriana | Salicaceae
|
| SASCP | Salix scouleriana Barratt ex Hook. var. poikila Schneid. | Salix scouleriana | Salicaceae
|
| SASCT | Salix scouleriana Barratt ex Hook. var. thompsonii Ball | Salix scouleriana | Salicaceae
|
| SASC | Salix scouleriana Barratt ex Hook. | Scouler's willow | Salicaceae
|
| SASE14 | Salix seemanii Rydb. | Salix glauca ssp. glauca var. acutifolia | Salicaceae
|
| SASE11 | Salix sensitiva Barratt | Salix discolor | Salicaceae
|
| SASEC3 | Salix �sepulcralis Simonkai var. chrysocoma (Dode) Meikle | Salix sepulcralis | Salicaceae
|
| SASE10 | Salix �sepulcralis Simonkai | weeping willow | Salicaceae
|
| SASES | Salix sericea Marsh. var. subsericea (Anderss.) Rydb. | Salix petiolaris | Salicaceae
|
| SASE | Salix sericea Marsh. | silky willow | Salicaceae
|
| SASE12 | Salix seriocarpa Buser | Salix pellita | Salicaceae
|
| SASE2 | Salix serissima (Bailey) Fern. | autumn willow | Salicaceae
|
| SASEH | Salix sessilifolia Nutt. var. hindsiana (Benth.) Anderss. | Salix exigua | Salicaceae
|
| SASEL | Salix sessilifolia Nutt. var. leucodendroides (Rowlee) Schneid. | Salix exigua | Salicaceae
|
| SASEV | Salix sessilifolia Nutt. var. vancouverensis Brayshaw | Salix melanopsis | Salicaceae
|
| SASEV2 | Salix sessilifolia Nutt. var. villosa Anderss. | Salix sessilifolia | Salicaceae
|
| SASE3 | Salix sessilifolia Nutt. | northwest sandbar willow | Salicaceae
|
| SASE4 | Salix setchelliana Ball | Setchell's willow | Salicaceae
|
| SASIA | Salix sitchensis Sanson ex Bong. var. angustifolia Bebb | Salix jepsonii | Salicaceae
|
| SASIC | Salix sitchensis Sanson ex Bong. var. congesta (Anderss.) Anderss. | Salix sitchensis | Salicaceae
|
| SASID | Salix sitchensis Sanson ex Bong. var. denudata (Anderss.) Anderss. | Salix sitchensis | Salicaceae
|
| SASIP2 | Salix sitchensis Sanson ex Bong. var. parviflora (Jepson) Jepson | Salix sitchensis | Salicaceae
|
| SASIP | Salix sitchensis Sanson ex Bong. var. pellita (Anderss.) Jepson | Salix pellita | Salicaceae
|
| SASIR | Salix sitchensis Sanson ex Bong. var. ralphiana (Jepson) Jepson | Salix sitchensis | Salicaceae
|
| SASI2 | Salix sitchensis Sanson ex Bong. | Sitka willow | Salicaceae
|
| SASM2 | Salix �smithiana Willd. (pro sp.) | silky-leaf osier | Salicaceae
|
| SASO4 | Salix �solheimii E.H. Kelso | | Salicaceae
|
| SASPA | Salix speciosa Hook. & Arn. var. alaxensis Anderss. | Salix alaxensis var. alaxensis | Salicaceae
|
| SASP9 | Salix speciosa Hook. & Arn., non Host nec Nutt. | Salix alaxensis var. alaxensis | Salicaceae
|
| SASP8 | Salix speciosa Nutt., non Host nec Hook. & Arn. | Salix lucida ssp. lasiandra | Salicaceae
|
| SASPP | Salix sphenophylla Skvort. ssp. pseudotorulosa Skvort. | Salix sphenophylla | Salicaceae
|
| SASP2 | Salix sphenophylla Skvort. | wedgeleaf willow | Salicaceae
|
| SASQ2 | Salix squamata Rydb. | Salix discolor | Salicaceae
|
| SAST9 | Salix stagnalis Nutt. | Salix scouleriana | Salicaceae
|
| SASTB | Salix starkeana Willd. ssp. bebbiana (Sarg.) Youngberg | Salix bebbiana | Salicaceae
|
| SAST12 | Salix stenophylla Rydb. | Salix exigua | Salicaceae
|