| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| CAROA2 | Carex rostrata Stokes var. ambigens Fern. | Carex rostrata | Cyperaceae
|
| CAROA3 | Carex rostrata Stokes var. anticostensis Fern. | Carex stenolepis | Cyperaceae
|
| CAROU | Carex rostrata Stokes var. utriculata (Boott) Bailey | Carex utriculata | Cyperaceae
|
| CARO6 | Carex rostrata Stokes | beaked sedge | Cyperaceae
|
| CAROC2 | Carex rotundata Wahlenb. var. compacta (R.Br. ex Dewey) Boivin | Carex saxatilis | Cyperaceae
|
| CARO7 | Carex rotundata Wahlenb. | round sedge | Cyperaceae
|
| CARO24 | Carex rousseaui Raymond | Carex haydenii | Cyperaceae
|
| CARUT | Carex rugosperma Mackenzie var. tonsa (Fern.) E.G. Voss | Carex tonsa var. tonsa | Cyperaceae
|
| CARU5 | Carex rugosperma Mackenzie | Carex tonsa var. rugosperma | Cyperaceae
|
| CARUD2 | Carex rupestris All. ssp. drummondiana (Dewey) Holub | Carex rupestris var. drummondiana | Cyperaceae
|
| CARUD | Carex rupestris All. var. drummondiana (Dewey) Bailey | Drummond's sedge | Cyperaceae
|
| CARUR | Carex rupestris All. var. rupestris | curly sedge | Cyperaceae
|
| CARU3 | Carex rupestris All. | curly sedge | Cyperaceae
|
| CARU12 | Carex rusbyi Mackenzie | Carex vallicola var. rusbyi | Cyperaceae
|
| CARU6 | Carex ruthii Mackenzie | Ruth's sedge | Cyperaceae
|
| CASAL | Carex sabulosa Turcz. ex Kunth ssp. leiophylla (Mackenzie) Porsild | Carex sabulosa | Cyperaceae
|
| CASA5 | Carex sabulosa Turcz. ex Kunth | Baikal sedge | Cyperaceae
|
| CASAK | Carex salina Wahlenb. var. kattegatensis (Fries) Almquist | Carex recta | Cyperaceae
|
| CASAS11 | Carex salina Wahlenb. var. subspathacea (Wormsk. ex Hornem.) Tuckerman | Carex subspathacea | Cyperaceae
|
| CASA6 | Carex saliniformis Mackenzie | Carex hassei | Cyperaceae
|
| CASA14 | Carex saltuensis Bailey | Carex vaginata | Cyperaceae
|
| CASA7 | Carex sartwelliana Olney | Yosemite sedge | Cyperaceae
|
| CASAS5 | Carex sartwellii Dewey var. sartwellii | Sartwell's sedge | Cyperaceae
|
| CASAS6 | Carex sartwellii Dewey var. stenorrhyncha F.J. Herm. | Sartwell's sedge | Cyperaceae
|
| CASA8 | Carex sartwellii Dewey | Sartwell's sedge | Cyperaceae
|
| CASAL2 | Carex saxatilis L. ssp. laxa (Trautv.) Kalela | Carex saxatilis | Cyperaceae
|
| CASAM | Carex saxatilis L. var. major Olney | Carex physocarpioides | Cyperaceae
|
| CASAM2 | Carex saxatilis L. var. miliaris (Michx.) Bailey | Carex saxatilis | Cyperaceae
|
| CASAR | Carex saxatilis L. var. rhomalea Fern. | Carex saxatilis | Cyperaceae
|
| CASA10 | Carex saxatilis L. | rock sedge | Cyperaceae
|
| CASA9 | Carex saximontana Mackenzie | Rocky Mountain sedge | Cyperaceae
|
| CASC13 | Carex scabrata Schwein. | eastern rough sedge | Cyperaceae
|
| CASC14 | Carex scabriuscula Mackenzie | Carex gigas | Cyperaceae
|
| CASC8 | Carex schottii Dewey | Schott's sedge | Cyperaceae
|
| CASC9 | Carex schweinitzii Dewey ex Schwein. | Schweinitz's sedge | Cyperaceae
|
| CASC15 | Carex scirpiformis Mackenzie | Carex scirpoidea | Cyperaceae
|
| CASCC4 | Carex scirpoidea Michx. var. convoluta K�kenth. | Carex scirpoidea | Cyperaceae
|
| CASCC2 | Carex scirpoidea Michx. var. curatorum (Stacey) Cronq. | Carex curatorum | Cyperaceae
|
| CASCP2 | Carex scirpoidea Michx. var. pseudoscirpoidea (Rydb.) Cronq. | Carex pseudoscirpoidea | Cyperaceae
|
| CASCS5 | Carex scirpoidea Michx. var. scirpiformis (Mackenzie) O'Neill & Duman | Carex scirpoidea | Cyperaceae
|
| CASCS6 | Carex scirpoidea Michx. var. stenochlaena Holm | Carex scirpoidea | Cyperaceae
|
| CASC10 | Carex scirpoidea Michx. | northern singlespike sedge | Cyperaceae
|
| CASCC3 | Carex scoparia Schkuhr ex Willd. var. condensa Fern. | Carex scoparia var. scoparia | Cyperaceae
|
| CASCM2 | Carex scoparia Schkuhr ex Willd. var. moniliformis Tuckerman | Carex scoparia var. scoparia | Cyperaceae
|
| CASCS | Carex scoparia Schkuhr ex Willd. var. scoparia | broom sedge | Cyperaceae
|
| CASCT | Carex scoparia Schkuhr ex Willd. var. tessellata Fern. & Wieg. | broom sedge | Cyperaceae
|
| CASC11 | Carex scoparia Schkuhr ex Willd. | broom sedge | Cyperaceae
|
| CASCB | Carex scopulorum Holm var. bracteosa (Bailey) F.J. Herm. | mountain sedge | Cyperaceae
|
| CASCC | Carex scopulorum Holm var. chimaphila (Holm) K�kenth. | Carex scopulorum var. scopulorum | Cyperaceae
|
| CASCP | Carex scopulorum Holm var. prionophylla (Holm) L.A. Standley | firethread sedge | Cyperaceae
|
| CASCS2 | Carex scopulorum Holm var. scopulorum | mountain sedge | Cyperaceae
|
| CASC12 | Carex scopulorum Holm | mountain sedge | Cyperaceae
|
| CASE | Carex senta Boott | swamp carex | Cyperaceae
|
| CASE6 | Carex seorsa Howe | weak stellate sedge | Cyperaceae
|
| CASE23 | Carex serotina M�rat | Carex viridula ssp. viridula | Cyperaceae
|
| CASE2 | Carex serratodens W. Boott | twotooth sedge | Cyperaceae
|
| CASEA6 | Carex setacea Dewey var. ambigua (Barratt) Fern. | Carex annectens | Cyperaceae
|
| CASE22 | Carex setacea Dewey | Carex vulpinoidea var. vulpinoidea | Cyperaceae
|
| CASH | Carex sheldonii Mackenzie | Sheldon's sedge | Cyperaceae
|
| CASH2 | Carex shortiana Dewey | Short's sedge | Cyperaceae
|
| CASH6 | Carex shriveri Britt. | Carex granularis var. haleana | Cyperaceae
|
| CASI12 | Carex siccata Dewey | Carex foenea var. foenea | Cyperaceae
|
| CASI6 | Carex silicea Olney | beach sedge | Cyperaceae
|
| CASI2 | Carex simulata Mackenzie | analogue sedge | Cyperaceae
|
| CASI3 | Carex sitchensis Prescott ex Bong. | Carex aquatilis var. dives | Cyperaceae
|
| CASM2 | Carex smalliana Mackenzie | Carex lonchocarpa | Cyperaceae
|
| CASO | Carex socialis Mohlenbrock & Schwegm. | low woodland sedge | Cyperaceae
|
| CASO10 | Carex sonomensis Stacey | sedge | Cyperaceae
|
| CASO5 | Carex soperi Raup | Carex macloviana | Cyperaceae
|
| CASPA2 | Carex sparganioides Muhl. ex Willd. var. aggregata (Mackenzie) Gleason | Carex aggregata | Cyperaceae
|
| CASPC | Carex sparganioides Muhl. ex Willd. var. cephaloidea (Dewey) Carey | Carex cephaloidea | Cyperaceae
|
| CASP3 | Carex sparganioides Muhl. ex Willd. | burr reed sedge | Cyperaceae
|
| CASP4 | Carex specifica Bailey | narrowfruit sedge | Cyperaceae
|
| CASP5 | Carex spectabilis Dewey | showy sedge | Cyperaceae
|
| CASP9 | Carex specuicola J.T. Howell | Navajo sedge | Cyperaceae
|
| CASP10 | Carex spicata Huds. | prickly sedge | Cyperaceae
|
| CASPU | Carex spissa Bailey var. ultra (Bailey) K�kenth. | Carex ultra | Cyperaceae
|
| CASP6 | Carex spissa Bailey | San Diego sedge | Cyperaceae
|
| CASP7 | Carex sprengelii Dewey ex Spreng. | Sprengel's sedge | Cyperaceae
|
| CASQT | Carex squarrosa L. var. typhina (Michx.) Nutt. | Carex typhina | Cyperaceae
|
| CASQ2 | Carex squarrosa L. | squarrose sedge | Cyperaceae
|
| CAST39 | Carex stans Drej. | Carex aquatilis var. stans | Cyperaceae
|
| CAST26 | Carex stellulata auct. non Goodenough | Carex muricata | Cyperaceae
|
| CAST15 | Carex stenochlaena (Holm) Mackenzie | Carex scirpoidea | Cyperaceae
|
| CAST55 | Carex �stenolepis Lessing | | Cyperaceae
|
| CASTE3 | Carex stenophylla Wahlenb. ssp. eleocharis (Bailey) Hult�n | Carex duriuscula | Cyperaceae
|
| CASTE5 | Carex stenophylla Wahlenb. var. enervis K�kenth. | Carex duriuscula | Cyperaceae
|
| CAST40 | Carex stenophylla auct. non Wahlenb. | Carex duriuscula | Cyperaceae
|
| CAST25 | Carex stenoptera Mackenzie | Carex subfusca | Cyperaceae
|
| CAST4 | Carex stenoptila F.J. Herm. | riverbank sedge | Cyperaceae
|
| CAST16 | Carex sterilis Willd. | dioecious sedge | Cyperaceae
|
| CAST22 | Carex stevenii Holm | Carex norvegica ssp. stevenii | Cyperaceae
|
| CASTL | Carex stipata Muhl. ex Willd. var. laevivaginata K�kenth. | Carex laevivaginata | Cyperaceae
|
| CASTM | Carex stipata Muhl. ex Willd. var. maxima Chapman | stalkgrain sedge | Cyperaceae
|
| CASTO | Carex stipata Muhl. ex Willd. var. oklahomensis (Mackenzie) Gleason | Carex oklahomensis | Cyperaceae
|
| CASTS3 | Carex stipata Muhl. ex Willd. var. stipata | owlfruit sedge | Cyperaceae
|
| CASTU | Carex stipata Muhl. ex Willd. var. uberior C. Mohr | Carex stipata var. maxima | Cyperaceae
|
| CAST5 | Carex stipata Muhl. ex Willd. | owlfruit sedge | Cyperaceae
|
| CAST24 | Carex stolonifera Schwein. | Carex pensylvanica | Cyperaceae
|
| CASTI4 | Carex straminea Willd. ex Schkuhr var. invisa W. Boott | Carex hormathodes | Cyperaceae
|
| CASTM2 | Carex straminea Willd. ex Schkuhr var. mixta Bailey | Carex feta | Cyperaceae
|