| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| SCHKU | Schkuhria Roth | false threadleaf | Asteraceae
|
| SCBR5 | Schlegelia brachyantha Griseb. | higuerito de sierra | Bignoniaceae
|
| SCPO6 | Schlegelia portoricensis (Urban) Britt. | Schlegelia brachyantha | Bignoniaceae
|
| SCHLE | Schlegelia Miq. | Schlegelia | Bignoniaceae
|
| SCOL3 | Schleichera oleosa (Lour.) Oken | lac tree | Sapindaceae
|
| SCHLE2 | Schleichera Willd. | schleichera | Sapindaceae
|
| SCFO2 | Schleinitzia fosbergii L.I.Nevling & Ch.J.Niezgoda | strand tangantangan | Fabaceae
|
| SCHLE3 | Schleinitzia Warb. | strand tangantangan | Fabaceae
|
| SCLA9 | Schlotheimia lancifolia Bartr. | lanceleaf schlotheimia moss | Orthotrichaceae
|
| SCRU7 | Schlotheimia rugifolia (Hook.) Schwaegr. | ruggedleaf schlotheimia moss | Orthotrichaceae
|
| SCSU8 | Schlotheimia sullivantii C. M�ll. | Schlotheimia rugifolia | Orthotrichaceae
|
| SCHLO | Schlotheimia Brid. | schlotheimia moss | Orthotrichaceae
|
| SCGA4 | Schlumbergera gaertneri (Regel) Britton & Rose | Hatiora gaertneri | Cactaceae
|
| SCTR2 | Schlumbergera truncata (Haw.) Moran | false Christmas cactus | Cactaceae
|
| SCHLU | Schlumbergera Lem. | schlumbergera | Cactaceae
|
| SCAN6 | Schmaltzia anisophylla Greene | Rhus trilobata var. anisophylla | Anacardiaceae
|
| SCCR3 | Schmaltzia crenata (P. Mill.) Greene | Rhus aromatica var. aromatica | Anacardiaceae
|
| SCRA2 | Schmaltzia racemulosa Greene | Rhus trilobata var. racemulosa | Anacardiaceae
|
| SCTRA | Schmaltzia trilobata (Nutt.) Small var. anisophylla (Greene) Barkl. | Rhus trilobata var. anisophylla | Anacardiaceae
|
| SCTR4 | Schmaltzia trilobata (Nutt.) Small | Rhus trilobata var. trilobata | Anacardiaceae
|
| SCOC6 | Schmidelia occidentalis Sw. | Allophylus racemosus | Sapindaceae
|
| SCAN7 | Schobera angiosperma (Murr.) Britt. | Heliotropium angiospermum | Boraginaceae
|
| SCOC10 | Schoberia occidentalis S. Wats. | Suaeda calceoliformis | Chenopodiaceae
|
| SCDR | Schoenocaulon drummondii Gray | green feathershank | Liliaceae
|
| SCDU | Schoenocaulon dubium (Michx.) Small | Florida feathershank | Liliaceae
|
| SCTE2 | Schoenocaulon texanum Scheele | Texas feathershank | Liliaceae
|
| SCHOE | Schoenocaulon Gray | feathershank | Liliaceae
|
| SCAR5 | Schoenocrambe argillacea (Welsh & Atwood) Rollins | Uinta Basin plainsmustard | Brassicaceae
|
| SCBA80 | Schoenocrambe barnebyi (Welsh & Atwood) Rollins | Syes Butte plainsmustard | Brassicaceae
|
| SCLI12 | Schoenocrambe linearifolia (Gray) Rollins | slimleaf plainsmustard | Brassicaceae
|
| SCLI | Schoenocrambe linifolia (Nutt.) Greene | flaxleaf plainsmustard | Brassicaceae
|
| SCSU2 | Schoenocrambe suffrutescens (Rollins) Welsh & Chatterley | Glaucocarpum suffrutescens | Brassicaceae
|
| SCHOE2 | Schoenocrambe Greene | plainsmustard | Brassicaceae
|
| SCAL5 | Schoenolirion albiflorum (Raf.) R.R. Gates | white sunnybell | Liliaceae
|
| SCAL | Schoenolirion album Dur. | Hastingsia alba | Liliaceae
|
| SCBR | Schoenolirion bracteosum (S. Wats.) Jepson | Hastingsia bracteosa var. bracteosa | Liliaceae
|
| SCCR | Schoenolirion croceum (Michx.) Wood | yellow sunnybell | Liliaceae
|
| SCEL2 | Schoenolirion elliottii Feay ex Gray | Schoenolirion albiflorum | Liliaceae
|
| SCTE3 | Schoenolirion texanum (Scheele) Gray | Schoenolirion wrightii | Liliaceae
|
| SCWR3 | Schoenolirion wrightii Sherman | Texas sunnybell | Liliaceae
|
| SCHOE3 | Schoenolirion Torr. ex Dur. | sunnybell | Liliaceae
|
| SCACA | Schoenoplectus acutus (Muhl. ex Bigelow) A.& D. L�ve var. acutus | hardstem bulrush | Cyperaceae
|
| SCACO2 | Schoenoplectus acutus (Muhl. ex Bigelow) A.& D. L�ve var. occidentalis (S. Wats.) S.G. Sm. | tule | Cyperaceae
|
| SCAC3 | Schoenoplectus acutus (Muhl. ex Bigelow) A.& D. L�ve | hardstem bulrush | Cyperaceae
|
| SCAM6 | Schoenoplectus americanus (Pers.) Volk. ex Schinz & R. Keller | chairmaker's bulrush | Cyperaceae
|
| SCCA11 | Schoenoplectus californicus (C.A. Mey.) Palla | California bulrush | Cyperaceae
|
| SCCA25 | Schoenoplectus �carinatus (Sm.) Palla | oblong bulrush | Cyperaceae
|
| SCCO20 | Schoenoplectus �contortus (Eames) S.G. Sm. | contorted bulrush | Cyperaceae
|
| SCDE6 | Schoenoplectus deltarum (Schuyler) Soj�k | delta bulrush | Cyperaceae
|
| SCERR | Schoenoplectus erectus (Poir.) Palla ex Raynal ssp. raynalii (Schuyler) Lye | sharpscale bulrush | Cyperaceae
|
| SCER5 | Schoenoplectus erectus (Poir.) Palla ex Raynal | sharpscale bulrush | Cyperaceae
|
| SCET2 | Schoenoplectus etuberculatus (Steud.) Soj�k | Canby's bulrush | Cyperaceae
|
| SCFL11 | Schoenoplectus fluviatilis (Torr.) M.T. Strong | river bulrush | Cyperaceae
|
| SCGL11 | Schoenoplectus glaucus (Lam.) Kartesz, comb. nov. ined. | tuberous bulrush | Cyperaceae
|
| SCHA9 | Schoenoplectus hallii (Gray) S.G. Sm. | Hall's bulrush | Cyperaceae
|
| SCHE5 | Schoenoplectus heterochaetus (Chase) Soj�k | slender bulrush | Cyperaceae
|
| SCJUP | Schoenoplectus juncoides (Roxb.) Palla ssp. purshianus (Fern.) Soj�k | Schoenoplectus purshianus | Cyperaceae
|
| SCJU2 | Schoenoplectus juncoides (Roxb.) Palla | rock bulrush | Cyperaceae
|
| SCLAA | Schoenoplectus lacustris (L.) Palla ssp. acutus (Muhl. ex Bigelow) A.& D. L�ve | Schoenoplectus acutus var. acutus | Cyperaceae
|
| SCLAC | Schoenoplectus lacustris (L.) Palla ssp. creber (Fern.) A.& D. L�ve | Schoenoplectus tabernaemontani | Cyperaceae
|
| SCLAT4 | Schoenoplectus lacustris (L.) Palla ssp. tabernaemontani (K. C. Gmel.) A.& D. L�ve | Schoenoplectus tabernaemontani | Cyperaceae
|
| SCLAV | Schoenoplectus lacustris (L.) Palla ssp. validus (Vahl) T. Koyama | Schoenoplectus tabernaemontani | Cyperaceae
|
| SCLA14 | Schoenoplectus lacustris (L.) Palla | lakeshore bulrush | Cyperaceae
|
| SCMA8 | Schoenoplectus maritimus (L.) Lye | cosmopolitan bulrush | Cyperaceae
|
| SCMU10 | Schoenoplectus mucronatus (L.) Palla | bog bulrush | Cyperaceae
|
| SCNO5 | Schoenoplectus novae-angliae (Britt.) M.T. Strong | New England bulrush | Cyperaceae
|
| SCOB7 | Schoenoplectus �oblongatus (T. Koyama) Soj�k | | Cyperaceae
|
| SCPUB | Schoenoplectus pungens (Vahl) Palla var. badius (J.& K. Presl) S.G. Sm. | common threesquare | Cyperaceae
|
| SCPUL4 | Schoenoplectus pungens (Vahl) Palla var. longispicatus (Britt.) S.G. Sm. | common threesquare | Cyperaceae
|
| SCPUP5 | Schoenoplectus pungens (Vahl) Palla var. pungens | common threesquare | Cyperaceae
|
| SCPU10 | Schoenoplectus pungens (Vahl) Palla | common threesquare | Cyperaceae
|
| SCPU13 | Schoenoplectus purshianus (Fern.) M.T. Strong | weakstalk bulrush | Cyperaceae
|
| SCRO5 | Schoenoplectus robustus (Pursh) M.T. Strong | sturdy bulrush | Cyperaceae
|
| SCRU9 | Schoenoplectus rubiginosus (Beetle) Soj�k p.p. | Schoenoplectus acutus var. occidentalis | Cyperaceae
|
| SCSA8 | Schoenoplectus saximontanus (Fern.) Raynal | Rocky Mountain bulrush | Cyperaceae
|
| SCSC12 | Schoenoplectus �scheuchzeri (Bruegger) Palla ex Janchen, nomen invalid. | Schoenoplectus carinatus | Cyperaceae
|
| SCSE | Schoenoplectus setaceus (L.) Palla | Isolepis setacea | Cyperaceae
|
| SCSM2 | Schoenoplectus smithii (Gray) Soj�k | Smith's bulrush | Cyperaceae
|
| SCST10 | Schoenoplectus �steinmetzii (Fern.) S.G. Sm. | | Cyperaceae
|
| SCSU10 | Schoenoplectus subterminalis (Torr.) Soj�k | swaying bulrush | Cyperaceae
|
| SCTA2 | Schoenoplectus tabernaemontani (K.C. Gmel.) Palla | softstem bulrush | Cyperaceae
|
| SCTO3 | Schoenoplectus torreyi (Olney) Palla | Torrey's bulrush | Cyperaceae
|
| SCTR5 | Schoenoplectus triqueter (L.) Palla | streambank bulrush | Cyperaceae
|
| SCVAC2 | Schoenoplectus validus (Vahl) A.& D. L�ve ssp. creber (Fern.) A.& D. L�ve | Schoenoplectus tabernaemontani | Cyperaceae
|
| SCVAL | Schoenoplectus validus (Vahl) A.& D. L�ve ssp. luxurians (Miq.) Soj�k | Schoenoplectus tabernaemontani | Cyperaceae
|
| SCVA3 | Schoenoplectus validus (Vahl) A.& D. L�ve | Schoenoplectus tabernaemontani | Cyperaceae
|
| SCHOE6 | Schoenoplectus (Reichenb.) Palla | bulrush | Cyperaceae
|
| SCLI10 | Schoenoprasum lineare Kunth | Allium kunthii | Liliaceae
|
| SCAP3 | Schoenus apogon Roemer & J.A. Schultes | smooth bogrush | Cyperaceae
|
| SCCA23 | Schoenus calostachyus Poir. | bogrush | Cyperaceae
|
| SCCO14 | Schoenus coloratus L. | Rhynchospora colorata | Cyperaceae
|
| SCFA | Schoenus fascicularis Michx. | Rhynchospora fascicularis var. fascicularis | Cyperaceae
|
| SCMI10 | Schoenus miliaceus Lam. | Rhynchospora miliacea | Cyperaceae
|
| SCNI | Schoenus nigricans L. | black bogrush | Cyperaceae
|
| SCRA3 | Schoenus rariflorus Michx. | Rhynchospora rariflora | Cyperaceae
|
| SCRU3 | Schoenus rugosus Vahl | Rhynchospora rugosa ssp. rugosa | Cyperaceae
|
| SCTE14 | Schoenus tendo Banks & Soland. ex Hook. f. | bogrush | Cyperaceae
|
| SCHOE4 | Schoenus L. | bogrush | Cyperaceae
|
| SCAR2 | Schoepfia arenaria Britt. | arana | Olacaceae
|
| SCCH | Schoepfia chrysophylloides (A. Rich.) Planch. | Schoepfia schreberi | Olacaceae
|
| SCOB | Schoepfia obovata C. Wright | white beefwood | Olacaceae
|