| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| SAST10 | Salix stricta (Anderss.) Rydb. | Salix brachycarpa | Salicaceae
|
| SASU9 | Salix subcaerulea Piper | Salix drummondiana | Salicaceae
|
| SASU10 | Salix subcordata Anderss. | Salix glauca ssp. glauca var. villosa | Salicaceae
|
| SASU3 | Salix �subsericea (Anderss.) Schneid. | Salix petiolaris | Salicaceae
|
| SASU13 | Salix suksdorfii Gandog. | Salix lasiolepis var. lasiolepis | Salicaceae
|
| SASY4 | Salix syrticola Fern. | Salix cordata | Salicaceae
|
| SATAL | Salix taxifolia Kunth var. lejocarpa Anderss. | Salix taxifolia | Salicaceae
|
| SATAL2 | Salix taxifolia Kunth var. limitanea I.M. Johnston | Salix taxifolia | Salicaceae
|
| SATAS | Salix taxifolia Kunth var. seriocarpa Anderss. | Salix taxifolia | Salicaceae
|
| SATA | Salix taxifolia Kunth | yewleaf willow | Salicaceae
|
| SATE6 | Salix tenera Anderss. | Salix cascadensis | Salicaceae
|
| SATE7 | Salix tenerrima (Henderson) Heller | Salix melanopsis | Salicaceae
|
| SATH3 | Salix thurberi Rowlee | Salix exigua | Salicaceae
|
| SATO4 | Salix torreyana Barratt | Salix eriocephala | Salicaceae
|
| SATO3 | Salix tortulosa Trautv. | Salix arctica | Salicaceae
|
| SATO5 | Salix toumeyi Britt. & Shafer | Salix bonplandiana | Salicaceae
|
| SATR | Salix tracyi Ball | Salix lasiolepis var. lasiolepis | Salicaceae
|
| SATRG | Salix tristis Ait. var. glabrata (Anderss.) Anderss. | Salix humilis var. humilis | Salicaceae
|
| SATRL | Salix tristis Ait. var. longifolia Anderss. | Salix humilis var. tristis | Salicaceae
|
| SATRM | Salix tristis Ait. var. microphylla Anderss. | Salix humilis var. tristis | Salicaceae
|
| SATRM2 | Salix tristis Ait. var. momadelphia Barratt | Salix humilis var. tristis | Salicaceae
|
| SATR2 | Salix tristis Ait. | Salix humilis var. tristis | Salicaceae
|
| SATU3 | Salix tundricola Schljak. | Salix nummularia | Salicaceae
|
| SATW | Salix tweedyi (Bebb ex Rose) Ball | Tweedy's willow | Salicaceae
|
| SAUN3 | Salix unalaschensis Cham. | Salix ovalifolia var. ovalifolia | Salicaceae
|
| SAUV | Salix uva-ursi Pursh | bearberry willow | Salicaceae
|
| SAVAO | Salix vagans Hook. f. ex Anderss. var. occidentalis Anderss. | Salix bebbiana | Salicaceae
|
| SAVAR | Salix vagans Hook. f. ex Anderss. var. rostrata (Richards.) Anderss. | Salix bebbiana | Salicaceae
|
| SAVA6 | Salix vallicola (Dudley) Britt. & Shafer | Salix gooddingii | Salicaceae
|
| SAVE8 | Salix venusta Anderss. | Salix nivalis | Salicaceae
|
| SAVEL | Salix vestita Pursh ssp. leiolepis (Fern.) Argus | Salix vestita | Salicaceae
|
| SAVEE | Salix vestita Pursh var. erecta Anderss. | Salix vestita | Salicaceae
|
| SAVEH | Salix vestita Pursh var. humilior Anderss. | Salix vestita | Salicaceae
|
| SAVEN | Salix vestita Pursh var. nana Hook. | Salix nivalis | Salicaceae
|
| SAVEP | Salix vestita Pursh var. psilophylla Fern. & St. John | Salix vestita | Salicaceae
|
| SAVE | Salix vestita Pursh | rock willow | Salicaceae
|
| SAVIA2 | Salix villosa D. Don ex Hook. var. acutifolia Hook. | Salix glauca ssp. glauca var. acutifolia | Salicaceae
|
| SAVI10 | Salix villosa D. Don ex Hook. | Salix glauca ssp. glauca var. villosa | Salicaceae
|
| SAVI2 | Salix viminalis L. | basket willow | Salicaceae
|
| SAVI80 | Salix vitellina L. | Salix alba | Salicaceae
|
| SAWA | Salix �waghornei Rydb. (pro sp.) | | Salicaceae
|
| SAWA4 | Salix walpolei (Coville & Ball) Ball | Salix hastata | Salicaceae
|
| SAWA5 | Salix wardii (Bebb) Bebb | Salix caroliniana | Salicaceae
|
| SAWA6 | Salix watsonii (Bebb) Rydb. | Salix lutea | Salicaceae
|
| SAWH | Salix wheeleri (Rowlee) Rydb. | Salix interior | Salicaceae
|
| SAWOI | Salix wolfii Bebb ssp. idahoensis (Ball) E. Murr. | Salix wolfii | Salicaceae
|
| SAWOI2 | Salix wolfii Bebb var. idahoensis Ball | Salix wolfii | Salicaceae
|
| SAWOP | Salix wolfii Bebb var. pseudolapponum (von Seem.) M.E. Jones | Salix glauca ssp. glauca var. villosa | Salicaceae
|
| SAWO | Salix wolfii Bebb | Wolf's willow | Salicaceae
|
| SAWR3 | Salix wrightii Anderss. | Salix amygdaloides | Salicaceae
|
| SAWY | Salix wyomingensis Rydb. | Salix glauca ssp. glauca var. villosa | Salicaceae
|
| SALIX | Salix L. | willow | Salicaceae
|
| SAMA24 | Salmalia malabarica (DC.) Schott & Endl. | Bombax ceiba | Bombacaceae
|
| SASC3 | Salmea scandens (L.) DC. | bejuco de miel | Asteraceae
|
| SALME | Salmea DC. | bejuco de miel | Asteraceae
|
| SACA46 | Salomonia cantoniensis Lour. | | Polygalaceae
|
| SACO14 | Salomonia cobrensis Woot. & Standl. | Polygonatum cobrense | Liliaceae
|
| SALOM | Salomonia Lour. | | Polygalaceae
|
| SAOR4 | Salpichroa origanifolia (Lam.) Baill. | lily of the valley vine | Solanaceae
|
| SARH3 | Salpichroa rhomboidea (Gillies & Hook.) Miers | Salpichroa origanifolia | Solanaceae
|
| SALPI | Salpichroa Miers | salpichroa | Solanaceae
|
| SAER5 | Salpiglossis erecta (DC.) D'Arcy | Bouchetia erecta | Solanaceae
|
| SASI19 | Salpiglossis sinuata Ruiz & Pav�n | painted tongue | Solanaceae
|
| SALPI3 | Salpiglossis K. Koch | salpiglossis | Solanaceae
|
| SAHA9 | Salpingia hartwegii (Benth.) Raimann | Calylophus hartwegii ssp. hartwegii | Onagraceae
|
| SACO25 | Salpingostylis coelestina (Bartr.) Small | Calydorea coelestina | Iridaceae
|
| SAAU3 | Salsola australis R. Br. | Salsola tragus | Chenopodiaceae
|
| SACA41 | Salsola caroliniana Walt. | Salsola kali ssp. kali | Chenopodiaceae
|
| SACO8 | Salsola collina Pallas | slender Russian thistle | Chenopodiaceae
|
| SAIB | Salsola iberica (Sennen & Pau) Botsch. ex Czerepanov | Salsola tragus | Chenopodiaceae
|
| SAKAK | Salsola kali L. ssp. kali | Russian thistle | Chenopodiaceae
|
| SAKAP | Salsola kali L. ssp. pontica (Pallas) Mosyakin | Russian thistle | Chenopodiaceae
|
| SAKAR | Salsola kali L. ssp. ruthenica (Iljin) So� | Salsola tragus | Chenopodiaceae
|
| SAKAT6 | Salsola kali L. ssp. tenuifolia Moq. | Salsola tragus | Chenopodiaceae
|
| SAKAT3 | Salsola kali L. ssp. tragus (L.) Celak. | Salsola tragus | Chenopodiaceae
|
| SAKAC | Salsola kali L. var. caroliniana (Walt.) Nutt. | Salsola kali ssp. kali | Chenopodiaceae
|
| SAKAP2 | Salsola kali L. var. pontica Pallas | Salsola kali ssp. pontica | Chenopodiaceae
|
| SAKA | Salsola kali L. | Russian thistle | Chenopodiaceae
|
| SAPA8 | Salsola paulsenii Litv. | barbwire Russian thistle | Chenopodiaceae
|
| SAPE10 | Salsola pestifer A. Nels. | Salsola tragus | Chenopodiaceae
|
| SAPO12 | Salsola pontica (Pallas) A. Degen | Salsola kali ssp. pontica | Chenopodiaceae
|
| SARU10 | Salsola ruthenica Iljin | Salsola tragus | Chenopodiaceae
|
| SASO3 | Salsola soda L. | oppositeleaf Russian thistle | Chenopodiaceae
|
| SATR12 | Salsola tragus L. | prickly Russian thistle | Chenopodiaceae
|
| SAVE6 | Salsola vermiculata L. | shrubby Russian thistle | Chenopodiaceae
|
| SALSO | Salsola L. | Russian thistle | Chenopodiaceae
|
| SAAE | Salvia aethiopis L. | Mediterranean sage | Lamiaceae
|
| SAAM5 | Salvia amissa Epling | Santa Catalina Mountain sage | Lamiaceae
|
| SAAPA | Salvia apiana Jepson var. apiana | white sage | Lamiaceae
|
| SAAPC | Salvia apiana Jepson var. compacta Munz | compact white sage | Lamiaceae
|
| SAAP2 | Salvia apiana Jepson | white sage | Lamiaceae
|
| SAAR25 | Salvia argentea L. | silver sage | Lamiaceae
|
| SAAR8 | Salvia arizonica Gray | desert indigo sage | Lamiaceae
|
| SAAZI | Salvia azurea Michx. ex Lam. ssp. intermedia Epling | Salvia azurea var. grandiflora | Lamiaceae
|
| SAAZP | Salvia azurea Michx. ex Lam. ssp. pitcheri (Torr. ex Benth.) Epling | Salvia azurea var. grandiflora | Lamiaceae
|
| SAAZA | Salvia azurea Michx. ex Lam. var. azurea | azure blue sage | Lamiaceae
|
| SAAZG | Salvia azurea Michx. ex Lam. var. grandiflora Benth. | pitcher sage | Lamiaceae
|
| SAAZ | Salvia azurea Michx. ex Lam. | azure blue sage | Lamiaceae
|
| SABAP | Salvia ballotiflora Benth. var. pinguifolia Fern. | Salvia pinguifolia | Lamiaceae
|
| SABA5 | Salvia ballotiflora Benth. | shrubby blue sage | Lamiaceae
|
| SABE3 | Salvia �bernardina Parish ex Greene (pro sp.) | | Lamiaceae
|