| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| SAVI16 | Salvia virgata auct. non Jacq. | Salvia superba | Lamiaceae
|
| SALVI | Salvia L. | sage | Lamiaceae
|
| SAAU | Salvinia auriculata Aubl. | eared watermoss | Salviniaceae
|
| SAAU10 | Salvinia auriculata auct. non Aubl. | Salvinia minima | Salviniaceae
|
| SABI9 | Salvinia biloba Raddi | giant salvinia | Salviniaceae
|
| SAHE7 | Salvinia herzogii de la Sota | giant salvinia | Salviniaceae
|
| SALA14 | Salvinia laevigata Humb. & Bonpl. ex Willd. | Limnobium laevigatum | Hydrocharitaceae
|
| SAMI7 | Salvinia minima Baker | water spangles | Salviniaceae
|
| SAMO5 | Salvinia molesta Mitchell | kariba-weed | Salviniaceae
|
| SANA5 | Salvinia natans (L.) All. | floating watermoss | Salviniaceae
|
| SANA4 | Salvinia natans auct. non (L.) All. | Salvinia auriculata | Salviniaceae
|
| SARO9 | Salvinia rotundifolia Willd. | Salvinia auriculata | Salviniaceae
|
| SARO10 | Salvinia rotundifolia auct. non Willd. | Salvinia minima | Salviniaceae
|
| SALVI2 | Salvinia S�guier | watermoss | Salviniaceae
|
| SAIN13 | Samadera indica Gaertn. | | Simaroubaceae
|
| SAMAD | Samadera Gaertn. | | Simaroubaceae
|
| SASA10 | Samanea saman (Jacq.) Merr. | raintree | Fabaceae
|
| SAMAN | Samanea Merr. | raintree | Fabaceae
|
| SAAF | Sambucus africana Standl. | | Caprifoliaceae
|
| SACA11 | Sambucus callicarpa Greene | Sambucus racemosa var. racemosa | Caprifoliaceae
|
| SACAL2 | Sambucus canadensis L. var. laciniata Gray | Sambucus nigra ssp. canadensis | Caprifoliaceae
|
| SACAS2 | Sambucus canadensis L. var. submollis Rehd. | Sambucus nigra ssp. canadensis | Caprifoliaceae
|
| SACA12 | Sambucus canadensis L. | Sambucus nigra ssp. canadensis | Caprifoliaceae
|
| SACEM3 | Sambucus cerulea Raf. var. mexicana (K. Presl ex DC.) L. Benson | Sambucus nigra ssp. canadensis | Caprifoliaceae
|
| SACEN | Sambucus cerulea Raf. var. neomexicana (Woot.) Rehd. | Sambucus nigra ssp. cerulea | Caprifoliaceae
|
| SACEV | Sambucus cerulea Raf. var. velutina (Dur. & Hilg.) Schwerin | Sambucus nigra ssp. cerulea | Caprifoliaceae
|
| SACE3 | Sambucus cerulea Raf. | Sambucus nigra ssp. cerulea | Caprifoliaceae
|
| SAEB | Sambucus ebulus L. | dwarf elderberry | Caprifoliaceae
|
| SAGL14 | Sambucus glauca Nutt. | Sambucus nigra ssp. cerulea | Caprifoliaceae
|
| SALA19 | Sambucus laciniata P. Mill. ex A. Murr. | Sambucus nigra ssp. nigra | Caprifoliaceae
|
| SAME4 | Sambucus melanocarpa Gray | Sambucus racemosa var. melanocarpa | Caprifoliaceae
|
| SAMEC | Sambucus mexicana K. Presl ex DC. ssp. cerulea (Raf.) E. Murr. | Sambucus nigra ssp. cerulea | Caprifoliaceae
|
| SAMEC2 | Sambucus mexicana K. Presl ex DC. var. cerulea (Raf.) E. Murr. | Sambucus nigra ssp. cerulea | Caprifoliaceae
|
| SAME5 | Sambucus mexicana K. Presl ex DC. | Sambucus nigra ssp. canadensis | Caprifoliaceae
|
| SAMI15 | Sambucus microbotrys Rydb. | Sambucus racemosa var. racemosa | Caprifoliaceae
|
| SANEV | Sambucus neomexicana Woot. var. vestita (Woot. & Standl.) Kearney & Peebles | Sambucus nigra ssp. cerulea | Caprifoliaceae
|
| SANE2 | Sambucus neomexicana Woot. | Sambucus nigra ssp. cerulea | Caprifoliaceae
|
| SANIC4 | Sambucus nigra L. ssp. canadensis (L.) R. Bolli | common elderberry | Caprifoliaceae
|
| SANIC5 | Sambucus nigra L. ssp. cerulea (Raf.) R. Bolli | blue elderberry | Caprifoliaceae
|
| SANIN2 | Sambucus nigra L. ssp. nigra | European black elderberry | Caprifoliaceae
|
| SANIL4 | Sambucus nigra L. var. laciniata L. | Sambucus nigra ssp. nigra | Caprifoliaceae
|
| SANI4 | Sambucus nigra L. | European black elderberry | Caprifoliaceae
|
| SAOR5 | Sambucus orbiculata Greene | Sambucus nigra ssp. canadensis | Caprifoliaceae
|
| SAPUA | Sambucus pubens Michx. var. arborescens Torr. & Gray | Sambucus racemosa var. racemosa | Caprifoliaceae
|
| SAPU11 | Sambucus pubens Michx. | Sambucus racemosa var. racemosa | Caprifoliaceae
|
| SARAP | Sambucus racemosa L. ssp. pubens (Michx.) House | Sambucus racemosa var. racemosa | Caprifoliaceae
|
| SARAA3 | Sambucus racemosa L. var. arborescens (Torr. & Gray) Gray | Sambucus racemosa var. racemosa | Caprifoliaceae
|
| SARAL2 | Sambucus racemosa L. var. leucocarpa (Torr. & Gray) Cronq. | Sambucus racemosa var. racemosa | Caprifoliaceae
|
| SARAM4 | Sambucus racemosa L. var. melanocarpa (Gray) McMinn | black elderberry | Caprifoliaceae
|
| SARAM5 | Sambucus racemosa L. var. microbotrys (Rydb.) Kearney & Peebles | Sambucus racemosa var. racemosa | Caprifoliaceae
|
| SARAP5 | Sambucus racemosa L. var. pubens (Michx.) Koehne | Sambucus racemosa var. racemosa | Caprifoliaceae
|
| SARAR3 | Sambucus racemosa L. var. racemosa | red elderberry | Caprifoliaceae
|
| SARA2 | Sambucus racemosa L. | red elderberry | Caprifoliaceae
|
| SASI3 | Sambucus simpsonii Rehd. ex Sarg. | Sambucus nigra ssp. canadensis | Caprifoliaceae
|
| SAVE3 | Sambucus velutina Dur. & Hilg. | Sambucus nigra ssp. cerulea | Caprifoliaceae
|
| SAMBU | Sambucus L. | elderberry | Caprifoliaceae
|
| SAEB3 | Samodia ebracteata (Kunth) Baudo | Samolus ebracteatus ssp. ebracteatus | Primulaceae
|
| SAAL7 | Samolus alyssoides Heller | Samolus ebracteatus ssp. alyssoides | Primulaceae
|
| SACU3 | Samolus cuneatus Small | Samolus ebracteatus ssp. cuneatus | Primulaceae
|
| SAEBA | Samolus ebracteatus Kunth ssp. alyssoides (Heller) R. Knuth | limewater brookweed | Primulaceae
|
| SAEBC | Samolus ebracteatus Kunth ssp. cuneatus (Small) R. Knuth | limewater brookweed | Primulaceae
|
| SAEBE | Samolus ebracteatus Kunth ssp. ebracteatus | limewater brookweed | Primulaceae
|
| SAEBA2 | Samolus ebracteatus Kunth var. alyssoides (Heller) Henrickson | Samolus ebracteatus ssp. alyssoides | Primulaceae
|
| SAEBC2 | Samolus ebracteatus Kunth var. cuneatus (Small) Henrickson | Samolus ebracteatus ssp. cuneatus | Primulaceae
|
| SAEB2 | Samolus ebracteatus Kunth | limewater brookweed | Primulaceae
|
| SAFL10 | Samolus floribundus Kunth | Samolus valerandi ssp. parviflorus | Primulaceae
|
| SAPA9 | Samolus parviflorus Raf. | Samolus valerandi ssp. parviflorus | Primulaceae
|
| SAVA2 | Samolus vagans Greene | Chiricahua Mountain brookweed | Primulaceae
|
| SAVAP | Samolus valerandi L. ssp. parviflorus (Raf.) Hult�n | seaside brookweed | Primulaceae
|
| SAVAV | Samolus valerandi L. ssp. valerandi | seaside brookweed | Primulaceae
|
| SAVA3 | Samolus valerandi L. | seaside brookweed | Primulaceae
|
| SAMOL | Samolus L. | brookweed | Primulaceae
|
| SACA40 | Samuela carnerosana auct. non Trel. | Yucca faxoniana | Agavaceae
|
| SAFA9 | Samuela faxoniana Trel. | Yucca faxoniana | Agavaceae
|
| SADO7 | Samyda dodecandra Jacq. | Guarea guidonia | Meliaceae
|
| SAGU2 | Samyda guidonia L. | Guarea guidonia | Meliaceae
|
| SASP5 | Samyda spinulosa Vent. | soldier crabtree | Flacourtiaceae
|
| SAMYD | Samyda Jacq. | samyda | Flacourtiaceae
|
| SASP7 | Sanchezia speciosa Leonard | shrubby whitevein | Acanthaceae
|
| SANCH | Sanchezia Ruiz & Pav�n | sanchezia | Acanthaceae
|
| SACAR | Sanguinaria canadensis L. var. rotundifolia (Greene) Fedde | Sanguinaria canadensis | Papaveraceae
|
| SACA13 | Sanguinaria canadensis L. | bloodroot | Papaveraceae
|
| SANGU | Sanguinaria L. | bloodroot | Papaveraceae
|
| SAAN2 | Sanguisorba annua (Nutt. ex Hook.) Torr. & Gray | prairie burnet | Rosaceae
|
| SACAL3 | Sanguisorba canadensis L. ssp. latifolia (Hook.) Calder & Taylor | Sanguisorba canadensis | Rosaceae
|
| SACAL | Sanguisorba canadensis L. var. latifolia Hook. | Sanguisorba canadensis | Rosaceae
|
| SACA14 | Sanguisorba canadensis L. | Canadian burnet | Rosaceae
|
| SAME6 | Sanguisorba menziesii Rydb. | Menzies' burnet | Rosaceae
|
| SAMI17 | Sanguisorba microcephala K. Presl | Sanguisorba officinalis | Rosaceae
|
| SAMIM | Sanguisorba minor Scop. ssp. muricata (Spach) Nordborg | small burnet | Rosaceae
|
| SAMI3 | Sanguisorba minor Scop. | small burnet | Rosaceae
|
| SAOC2 | Sanguisorba occidentalis Nutt. | western burnet | Rosaceae
|
| SAOFM | Sanguisorba officinalis L. ssp. microcephala (K. Presl) Calder & Taylor | Sanguisorba officinalis | Rosaceae
|
| SAOFP | Sanguisorba officinalis L. var. polygama (W. Nyl.) Mela & A. Caj. | Sanguisorba officinalis | Rosaceae
|
| SAOF3 | Sanguisorba officinalis L. | official burnet | Rosaceae
|
| SASI10 | Sanguisorba sitchensis C.A. Mey. | Sanguisorba canadensis | Rosaceae
|
| SAST11 | Sanguisorba stipulata Raf. | Sanguisorba canadensis | Rosaceae
|
| SANGU2 | Sanguisorba L. | burnet | Rosaceae
|
| SAAR9 | Sanicula arctopoides Hook. & Arn. | footsteps of spring | Apiaceae
|
| SAAR10 | Sanicula arguta Greene ex Coult. & Rose | sharptooth blacksnakeroot | Apiaceae
|
| SABI2 | Sanicula bipinnata Hook. & Arn. | poison sanicle | Apiaceae
|