| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| CRWO | Crataegus wootoniana Egglest. | Wooton's hawthorn | Rosaceae
|
| CRXA | Crataegus xanthophylla Sarg. | buffalo hawthorn | Rosaceae
|
| CRYO2 | Crataegus youngii Sarg. | Crataegus phaenopyrum | Rosaceae
|
| CRATA | Crataegus L. | hawthorn | Rosaceae
|
| CRPL5 | Craterostigma plantagineum Hochst. | blue gem | Scrophulariaceae
|
| CRPU15 | Craterostigma pumilum Hochst. | | Scrophulariaceae
|
| CRATE3 | Craterostigma Hochst. | craterostigma | Scrophulariaceae
|
| CRRE12 | Crateva religiosa Forster f. | sacred garlic pear | Capparaceae
|
| CRATE2 | Crateva L. | crateva | Capparaceae
|
| CRAR13 | Cratoneuron arcticum Steere | arctic cratoneuron moss | Amblystegiaceae
|
| CRCOF | Cratoneuron commutatum (Brid.) G. Roth var. falcatum (Brid.) M�nk. | Palustriella commutata | Amblystegiaceae
|
| CRCO19 | Cratoneuron commutatum (Brid.) G. Roth | Palustriella commutata | Amblystegiaceae
|
| CRCU5 | Cratoneuron curvicaule (Jur.) G. Roth | Cratoneuron filicinum | Amblystegiaceae
|
| CRDE11 | Cratoneuron decipiens (De Not.) Loeske | Palustriella decipiens | Amblystegiaceae
|
| CRFAW | Cratoneuron falcatum (Brid.) G. Roth var. williamsii (Grout) Flow. | Palustriella decipiens | Amblystegiaceae
|
| CRFA5 | Cratoneuron falcatum (Brid.) G. Roth | Palustriella commutata | Amblystegiaceae
|
| CRFIA | Cratoneuron filicinum (Hedw.) Spruce var. aciculinum (C. M�ll. & Kindb. in Mac. & Kindb.) Grout | Cratoneuron filicinum | Amblystegiaceae
|
| CRFIC | Cratoneuron filicinum (Hedw.) Spruce var. curvicaule (Jur.) M�nk. | Cratoneuron filicinum | Amblystegiaceae
|
| CRFI70 | Cratoneuron filicinum (Hedw.) Spruce | cratoneuron moss | Amblystegiaceae
|
| CRWI4 | Cratoneuron williamsii Grout | Palustriella decipiens | Amblystegiaceae
|
| CRATO2 | Cratoneuron (Sull.) Spruce | cratoneuron moss | Amblystegiaceae
|
| CRACA | Crepis acuminata Nutt. ssp. acuminata | tapertip hawksbeard | Asteraceae
|
| CRACP | Crepis acuminata Nutt. ssp. pluriflora Babcock & Stebbins | tapertip hawksbeard | Asteraceae
|
| CRACT | Crepis acuminata Nutt. ssp. typica Babcock & Stebbins | Crepis acuminata ssp. acuminata | Asteraceae
|
| CRAC2 | Crepis acuminata Nutt. | tapertip hawksbeard | Asteraceae
|
| CRAL5 | Crepis alpicola (Rydb.) A. Nels. | Crepis runcinata ssp. runcinata | Asteraceae
|
| CRATA2 | Crepis atribarba Heller ssp. atribarba | slender hawksbeard | Asteraceae
|
| CRATC | Crepis atribarba Heller ssp. cytotaxonomicorum (Boivin) W.A. Weber | Crepis atribarba ssp. atribarba | Asteraceae
|
| CRATO | Crepis atribarba Heller ssp. originalis (Babcock & Stebbins) Babcock & Stebbins | slender hawksbeard | Asteraceae
|
| CRATT | Crepis atribarba Heller ssp. typicus Babcock & Stebbins | Crepis atribarba ssp. atribarba | Asteraceae
|
| CRATC2 | Crepis atribarba Heller var. cytotaxonomicorum Boivin | Crepis atribarba ssp. atribarba | Asteraceae
|
| CRAT | Crepis atribarba Heller | slender hawksbeard | Asteraceae
|
| CRBAB | Crepis bakeri Greene ssp. bakeri | Baker's hawksbeard | Asteraceae
|
| CRBAC | Crepis bakeri Greene ssp. cusickii (Eastw.) Babcock & Stebbins | Cusick's hawksbeard | Asteraceae
|
| CRBAI | Crepis bakeri Greene ssp. idahoensis Babcock & Stebbins | Idaho hawksbeard | Asteraceae
|
| CRBA2 | Crepis bakeri Greene | Baker's hawksbeard | Asteraceae
|
| CRBA7 | Crepis barbata L. | Tolpis barbata | Asteraceae
|
| CRBA11 | Crepis barberi Greenm. | Crepis runcinata ssp. barberi | Asteraceae
|
| CRBA3 | Crepis barbigera Leib. ex Coville | Crepis atribarba ssp. originalis | Asteraceae
|
| CRBI3 | Crepis biennis L. | rough hawksbeard | Asteraceae
|
| CRBU3 | Crepis bursifolia L. | Italian hawksbeard | Asteraceae
|
| CRCA3 | Crepis capillaris (L.) Wallr. | smooth hawksbeard | Asteraceae
|
| CREL | Crepis elegans Hook. | elegant hawksbeard | Asteraceae
|
| CRFO2 | Crepis foetida L. | stinking hawksbeard | Asteraceae
|
| CRGLB | Crepis glauca (Nutt.) Torr. & Gray ssp. barberi (Greenm.) Babcock & Stebbins | Crepis runcinata ssp. barberi | Asteraceae
|
| CRGL5 | Crepis glauca (Nutt.) Torr. & Gray | Crepis runcinata ssp. glauca | Asteraceae
|
| CRGL6 | Crepis glaucella Rydb. | Crepis runcinata ssp. runcinata | Asteraceae
|
| CRIN4 | Crepis intermedia Gray | limestone hawksbeard | Asteraceae
|
| CRJA4 | Crepis japonica (L.) Benth. | Youngia japonica | Asteraceae
|
| CRMOG3 | Crepis modocensis Greene ssp. glareosa (Piper) Babcock & Stebbins | Modoc hawksbeard | Asteraceae
|
| CRMOM | Crepis modocensis Greene ssp. modocensis | Modoc hawksbeard | Asteraceae
|
| CRMOR | Crepis modocensis Greene ssp. rostrata (Coville) Babcock & Stebbins | Modoc hawksbeard | Asteraceae
|
| CRMOS | Crepis modocensis Greene ssp. subacaulis (Kellogg) Babcock & Stebbins | Modoc hawksbeard | Asteraceae
|
| CRMOT | Crepis modocensis Greene ssp. typica Babcock & Stebbins | Crepis modocensis ssp. modocensis | Asteraceae
|
| CRMOR2 | Crepis modocensis Greene var. rostrata (Coville) Boivin | Crepis modocensis ssp. rostrata | Asteraceae
|
| CRMO4 | Crepis modocensis Greene | Modoc hawksbeard | Asteraceae
|
| CRMO5 | Crepis monticola Coville | mountain hawksbeard | Asteraceae
|
| CRNAC | Crepis nana Richards. ssp. clivicola Leggett | dwarf alpine hawksbeard | Asteraceae
|
| CRNAN | Crepis nana Richards. ssp. nana | dwarf alpine hawksbeard | Asteraceae
|
| CRNAR | Crepis nana Richards. ssp. ramosa Babcock | dwarf alpine hawksbeard | Asteraceae
|
| CRNAT2 | Crepis nana Richards. ssp. typica Babcock | Crepis nana ssp. nana | Asteraceae
|
| CRNAL | Crepis nana Richards. var. lyratifolia (Turcz.) Hult�n | Crepis nana ssp. nana | Asteraceae
|
| CRNAR2 | Crepis nana Richards. var. ramosa (Babcock) Cronq. | Crepis nana ssp. ramosa | Asteraceae
|
| CRNA | Crepis nana Richards. | dwarf alpine hawksbeard | Asteraceae
|
| CRNE3 | Crepis neomexicana Woot. & Standl. | Crepis runcinata ssp. runcinata | Asteraceae
|
| CRNI2 | Crepis nicaeensis Balbis ex Pers. | Turkish hawksbeard | Asteraceae
|
| CROCC | Crepis occidentalis Nutt. ssp. conjuncta (Jepson) Babcock & Stebbins | largeflower hawksbeard | Asteraceae
|
| CROCC2 | Crepis occidentalis Nutt. ssp. costata (Gray) Babcock & Stebbins | largeflower hawksbeard | Asteraceae
|
| CROCO2 | Crepis occidentalis Nutt. ssp. occidentalis | largeflower hawksbeard | Asteraceae
|
| CROCP | Crepis occidentalis Nutt. ssp. pumila (Rydb.) Babcock & Stebbins | largeflower hawksbeard | Asteraceae
|
| CROCT | Crepis occidentalis Nutt. ssp. typica Babcock & Stebbins | Crepis occidentalis ssp. occidentalis | Asteraceae
|
| CROCC3 | Crepis occidentalis Nutt. var. costata Gray | Crepis occidentalis ssp. costata | Asteraceae
|
| CROCN2 | Crepis occidentalis Nutt. var. nevadensis Kellogg | Crepis occidentalis ssp. conjuncta | Asteraceae
|
| CROCN | Crepis occidentalis Nutt. var. nevadensis Kellogg p.p. | Crepis modocensis ssp. subacaulis | Asteraceae
|
| CROCP2 | Crepis occidentalis Nutt. var. pumila (Rydb.) Babcock & Stebbins | Crepis occidentalis ssp. pumila | Asteraceae
|
| CROC | Crepis occidentalis Nutt. | largeflower hawksbeard | Asteraceae
|
| CRPA20 | Crepis pannonica (Jacq.) K. Koch | pasture hawksbeard | Asteraceae
|
| CRPE12 | Crepis perplexans Rydb. | Crepis runcinata ssp. runcinata | Asteraceae
|
| CRPL3 | Crepis platyphylla Greene | Crepis runcinata ssp. hispidulosa | Asteraceae
|
| CRPL | Crepis pleurocarpa Gray | nakedstem hawksbeard | Asteraceae
|
| CRPU3 | Crepis pulchra L. | smallflower hawksbeard | Asteraceae
|
| CRRI7 | Crepis rigida Waldst. & Kit. | Crepis pannonica | Asteraceae
|
| CRRI6 | Crepis riparia A. Nels. | Crepis runcinata ssp. hispidulosa | Asteraceae
|
| CRRU9 | Crepis rubra L. | red hawksbeard | Asteraceae
|
| CRRUA | Crepis runcinata (James) Torr. & Gray ssp. andersonii (Gray) Babcock & Stebbins | Anderson's hawksbeard | Asteraceae
|
| CRRUB | Crepis runcinata (James) Torr. & Gray ssp. barberi (Greenm.) Babcock & Stebbins | Barber's hawksbeard | Asteraceae
|
| CRRUG | Crepis runcinata (James) Torr. & Gray ssp. glauca (Nutt.) Babcock & Stebbins | fiddleleaf hawksbeard | Asteraceae
|
| CRRUH | Crepis runcinata (James) Torr. & Gray ssp. hallii Babcock & Stebbins | Hall's hawksbeard | Asteraceae
|
| CRRUH2 | Crepis runcinata (James) Torr. & Gray ssp. hispidulosa (T.J. Howell ex Rydb.) Babcock & Stebbins | fiddleleaf hawksbeard | Asteraceae
|
| CRRUI | Crepis runcinata (James) Torr. & Gray ssp. imbricata Babcock & Stebbins | fiddleleaf hawksbeard | Asteraceae
|
| CRRUR | Crepis runcinata (James) Torr. & Gray ssp. runcinata | fiddleleaf hawksbeard | Asteraceae
|
| CRRUT | Crepis runcinata (James) Torr. & Gray ssp. typica Babcock & Stebbins | Crepis runcinata ssp. runcinata | Asteraceae
|
| CRRUA2 | Crepis runcinata (James) Torr. & Gray var. andersonii (Gray) Cronq. | Crepis runcinata ssp. andersonii | Asteraceae
|
| CRRUB2 | Crepis runcinata (James) Torr. & Gray var. barberi (Greenm.) B.L. Turner | Crepis runcinata ssp. barberi | Asteraceae
|
| CRRUG2 | Crepis runcinata (James) Torr. & Gray var. glauca (Nutt.) Boivin | Crepis runcinata ssp. glauca | Asteraceae
|
| CRRUH3 | Crepis runcinata (James) Torr. & Gray var. hispidulosa T.J. Howell ex Rydb. | Crepis runcinata ssp. hispidulosa | Asteraceae
|
| CRRUI2 | Crepis runcinata (James) Torr. & Gray var. imbricata (Babcock & Stebbins) M.E. Peck | Crepis runcinata ssp. imbricata | Asteraceae
|
| CRRU3 | Crepis runcinata (James) Torr. & Gray | fiddleleaf hawksbeard | Asteraceae
|
| CRSE2 | Crepis setosa Haller f. | bristly hawksbeard | Asteraceae
|
| CRTE3 | Crepis tectorum L. | narrowleaf hawksbeard | Asteraceae
|
| CRVEH | Crepis vesicaria L. ssp. haenseleri (Boiss. ex DC.) P.D. Sell | Crepis vesicaria ssp. taraxacifolia | Asteraceae
|