| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| SOSU2 | Sorghum subglabrescens Schweinf. & Aschers. | Sorghum bicolor ssp. bicolor | Poaceae
|
| SOSU4 | Sorghum sudanense (Piper) Stapf | Sorghum bicolor ssp. drummondii | Poaceae
|
| SOVE3 | Sorghum verticilliflorum (Steud.) Stapf | Sorghum bicolor ssp. arundinaceum | Poaceae
|
| SOVI5 | Sorghum virgatum (Hack.) Stapf | Sorghum bicolor ssp. arundinaceum | Poaceae
|
| SOVUC2 | Sorghum vulgare Pers. var. caffrorum (Retz.) Hubbard & Rehd. | Sorghum bicolor ssp. bicolor | Poaceae
|
| SOVUD4 | Sorghum vulgare Pers. var. drummondii (Nees ex Steud.) Hack. ex Chiov. | Sorghum bicolor ssp. drummondii | Poaceae
|
| SOVUD3 | Sorghum vulgare Pers. var. durra (Forsk.) Hubbard & Rehd. | Sorghum bicolor ssp. bicolor | Poaceae
|
| SOVUR2 | Sorghum vulgare Pers. var. roxburghii (Stapf) Haines | Sorghum bicolor ssp. bicolor | Poaceae
|
| SOVUS2 | Sorghum vulgare Pers. var. saccharatum (L.) Boerl. | Sorghum bicolor ssp. bicolor | Poaceae
|
| SOVUT2 | Sorghum vulgare Pers. var. technicum (Koern.) J�v. | Sorghum bicolor ssp. bicolor | Poaceae
|
| SOVU2 | Sorghum vulgare Pers. | Sorghum bicolor ssp. bicolor | Poaceae
|
| SORGH2 | Sorghum Moench | sorghum | Poaceae
|
| SPFRG | Sparaxis fragrans (Jacq.) Ker-Gawl. ssp. grandiflora (D. Delar.) Goldbl. | fragrant wandflower | Iridaceae
|
| SPFR2 | Sparaxis fragrans (Jacq.) Ker-Gawl. | fragrant wandflower | Iridaceae
|
| SPGR9 | Sparaxis grandiflora (D. Delar.) Ker-Gawl. | Sparaxis fragrans ssp. grandiflora | Iridaceae
|
| SPTR | Sparaxis tricolor (Schneev.) Ker-Gawl. | wandflower | Iridaceae
|
| SPARA2 | Sparaxis Ker-Gawl. | wandflower | Iridaceae
|
| SPAC | Sparganium acaule (Beeby) Rydb. | Sparganium angustifolium | Sparganiaceae
|
| SPAM | Sparganium americanum Nutt. | American bur-reed | Sparganiaceae
|
| SPAN | Sparganium androcladum (Engelm.) Morong | branched bur-reed | Sparganiaceae
|
| SPAN2 | Sparganium angustifolium Michx. | narrowleaf bur-reed | Sparganiaceae
|
| SPCA14 | Sparganium californicum Greene | Sparganium eurycarpum | Sparganiaceae
|
| SPCHA | Sparganium chlorocarpum Rydb. var. acaule (Beeby) Fern. | Sparganium angustifolium | Sparganiaceae
|
| SPCH | Sparganium chlorocarpum Rydb. | Sparganium erectum ssp. stoloniferum | Sparganiaceae
|
| SPEMA | Sparganium emersum Rehmann var. angustifolium (Michx.) Taylor & MacBryde | Sparganium angustifolium | Sparganiaceae
|
| SPEMM | Sparganium emersum Rehmann var. multipedunculatum (Morong) Reveal | Sparganium angustifolium | Sparganiaceae
|
| SPEM2 | Sparganium emersum Rehmann | Sparganium angustifolium | Sparganiaceae
|
| SPERS2 | Sparganium erectum L. ssp. stoloniferum (Graebn.) Hara | simplestem bur-reed | Sparganiaceae
|
| SPER | Sparganium erectum L. | simplestem bur-reed | Sparganiaceae
|
| SPEUG | Sparganium eurycarpum Engelm. ex Gray var. greenei (Morong) Graebn. | Sparganium eurycarpum | Sparganiaceae
|
| SPEU | Sparganium eurycarpum Engelm. ex Gray | broadfruit bur-reed | Sparganiaceae
|
| SPFL | Sparganium fluctuans (Morong) B.L. Robins. | floating bur-reed | Sparganiaceae
|
| SPGL | Sparganium glomeratum (Laestad.) L. Neum. | clustered bur-reed | Sparganiaceae
|
| SPGR7 | Sparganium greenei Morong | Sparganium eurycarpum | Sparganiaceae
|
| SPHY | Sparganium hyperboreum Laestad. | northern bur-reed | Sparganiaceae
|
| SPLU4 | Sparganium lucidum Fern. & Eames | Sparganium androcladum | Sparganiaceae
|
| SPMI | Sparganium minimum (Hartman) Wallr. | Sparganium natans | Sparganiaceae
|
| SPMU3 | Sparganium multipedunculatum (Morong) Rydb. | Sparganium angustifolium | Sparganiaceae
|
| SPNA | Sparganium natans L. | small bur-reed | Sparganiaceae
|
| SPSI | Sparganium simplex Huds. | Sparganium erectum ssp. stoloniferum | Sparganiaceae
|
| SPARG | Sparganium L. | bur-reed | Sparganiaceae
|
| SPALG | Spartina alterniflora Loisel. var. glabra (Muhl. ex Bigelow) Fern. | Spartina alterniflora | Poaceae
|
| SPALP | Spartina alterniflora Loisel. var. pilosa (Merr.) Fern. | Spartina alterniflora | Poaceae
|
| SPAL | Spartina alterniflora Loisel. | smooth cordgrass | Poaceae
|
| SPAN5 | Spartina anglica C.E. Hubbard | common cordgrass | Poaceae
|
| SPBA | Spartina bakeri Merr. | sand cordgrass | Poaceae
|
| SPCA | Spartina �caespitosa A.A. Eat. (pro sp.) | | Poaceae
|
| SPCYP | Spartina cynosuroides (L.) Roth var. polystachya (Michx.) Beal ex Fern. | Spartina cynosuroides | Poaceae
|
| SPCY | Spartina cynosuroides (L.) Roth | big cordgrass | Poaceae
|
| SPDE2 | Spartina densiflora Brongn. | denseflower cordgrass | Poaceae
|
| SPFO | Spartina foliosa Trin. | California cordgrass | Poaceae
|
| SPGR | Spartina gracilis Trin. | alkali cordgrass | Poaceae
|
| SPMA6 | Spartina maritima (M.A. Curtis) Fern. | small cordgrass | Poaceae
|
| SPMI6 | Spartina michauxiana A.S. Hitchc. | Spartina pectinata | Poaceae
|
| SPPAC | Spartina patens (Ait.) Muhl. var. caespitosa (A.A. Eat.) A.S. Hitchc. | Spartina caespitosa | Poaceae
|
| SPPAJ | Spartina patens (Ait.) Muhl. var. juncea (Michx.) A.S. Hitchc. | Spartina patens | Poaceae
|
| SPPAM | Spartina patens (Ait.) Muhl. var. monogyna (M.A. Curtis) Fern. | Spartina patens | Poaceae
|
| SPPA | Spartina patens (Ait.) Muhl. | saltmeadow cordgrass | Poaceae
|
| SPPES | Spartina pectinata Bosc ex Link var. suttiei (Farw.) Fern. | Spartina pectinata | Poaceae
|
| SPPE | Spartina pectinata Bosc ex Link | prairie cordgrass | Poaceae
|
| SPSP | Spartina spartinae (Trin.) Merr. ex A.S. Hitchc. | gulf cordgrass | Poaceae
|
| SPST7 | Spartina stricta (Ait.) Roth | Spartina maritima | Poaceae
|
| SPTO | Spartina �townsendii H.& J. Groves (pro sp.) | | Poaceae
|
| SPART | Spartina Schreb. | cordgrass | Poaceae
|
| SPJU2 | Spartium junceum L. | Spanish broom | Fabaceae
|
| SPART2 | Spartium L. | broom | Fabaceae
|
| SPRA2 | Spathiger ramosus (Jacq.) Britt. | Epidendrum ramosum | Orchidaceae
|
| SPRI | Spathiger rigidus (Jacq.) Small | Epidendrum rigidum | Orchidaceae
|
| SPST | Spathiger strobilifera (Reichenb. f.) Small | Epidendrum strobiliferum | Orchidaceae
|
| SPCA2 | Spathodea campanulata Beauv. | African tuliptree | Bignoniaceae
|
| SPATH | Spathodea Beauv. | spathodea | Bignoniaceae
|
| SPPL | Spathoglottis plicata Blume | Philippine ground orchid | Orchidaceae
|
| SPATH2 | Spathoglottis Blume | ground orchid | Orchidaceae
|
| SPMI5 | Spathularia michauxii (Britt.) Small | Saxifraga michauxii | Saxifragaceae
|
| SPSP6 | Spathulata spuria (Bieb.) A.& D. L�ve | Sedum spurium | Crassulaceae
|
| SPFO2 | Spathyema foetida (L.) Raf. | Symplocarpus foetidus | Araceae
|
| SPFO3 | Spatularia foliolosa (R. Br.) Small | Saxifraga foliolosa | Saxifragaceae
|
| SPBI4 | Specularia biflora (Ruiz & Pav�n) Fisch. & C.A. Mey. | Triodanis perfoliata var. biflora | Campanulaceae
|
| SPHO | Specularia holzingeri (McVaugh) Fern. | Triodanis holzingeri | Campanulaceae
|
| SPLA6 | Specularia lamprosperma (McVaugh) Fern. | Triodanis lamprosperma | Campanulaceae
|
| SPLE2 | Specularia leptocarpa (Nutt.) Gray | Triodanis leptocarpa | Campanulaceae
|
| SPPE5 | Specularia perfoliata (L.) A. DC. | Triodanis perfoliata var. perfoliata | Campanulaceae
|
| SPRA | Specularia rariflora (Nutt.) McVaugh | Heterocodon rariflorum | Campanulaceae
|
| SPSP4 | Specularia speculum-veneris (L.) Tanfani | Legousia speculum-veneris | Campanulaceae
|
| SPEU2 | Speerschneidera euploca (Tuck.) Trevisan | | Bacidiaceae
|
| SPEER | Speerschneidera Trevisan | speerschneidera | Bacidiaceae
|
| SPIN10 | Spergella intermedia (Fenzl) A.& D. L�ve | Sagina nivalis | Caryophyllaceae
|
| SPNO | Spergella nodosa (L.) Reichenb. | Sagina nodosa ssp. nodosa | Caryophyllaceae
|
| SPSA4 | Spergella saginoides (L.) Reichenb. | Sagina saginoides | Caryophyllaceae
|
| SPARS2 | Spergula arvensis L. ssp. sativa (Boenn.) Celak. | Spergula arvensis | Caryophyllaceae
|
| SPARS | Spergula arvensis L. var. sativa (Boenn.) Mert. & Koch | Spergula arvensis | Caryophyllaceae
|
| SPAR | Spergula arvensis L. | corn spurry | Caryophyllaceae
|
| SPMO2 | Spergula morisonii Boreau | Morison's spurry | Caryophyllaceae
|
| SPPE4 | Spergula pentandra L. | wingstem spurry | Caryophyllaceae
|
| SPSA6 | Spergula sativa Boenn. | Spergula arvensis | Caryophyllaceae
|
| SPERG | Spergula L. | spurry | Caryophyllaceae
|
| SPAL4 | Spergularia alata Wieg. | Spergularia salina | Caryophyllaceae
|
| SPAT | Spergularia atrosperma R.P. Rossb. | blackseed sandspurry | Caryophyllaceae
|
| SPBO | Spergularia bocconii (Scheele) Foucaud ex Merino | Boccone's sandspurry | Caryophyllaceae
|
| SPCAC | Spergularia canadensis (Pers.) G. Don var. canadensis | Canadian sandspurry | Caryophyllaceae
|
| SPCAO | Spergularia canadensis (Pers.) G. Don var. occidentalis R.P. Rossb. | western sandspurry | Caryophyllaceae
|