| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| CHVIL10 | Chrysothamnus viscidiflorus (Hook.) Nutt. ssp. viscidiflorus var. latifolius (D.C. Eat.) Greene | yellow rabbitbrush | Asteraceae
|
| CHVIS5 | Chrysothamnus viscidiflorus (Hook.) Nutt. ssp. viscidiflorus var. stenophyllus (Gray) Hall | yellow rabbitbrush | Asteraceae
|
| CHVIV4 | Chrysothamnus viscidiflorus (Hook.) Nutt. ssp. viscidiflorus var. viscidiflorus | yellow rabbitbrush | Asteraceae
|
| CHVIV2 | Chrysothamnus viscidiflorus (Hook.) Nutt. ssp. viscidiflorus | yellow rabbitbrush | Asteraceae
|
| CHVIE3 | Chrysothamnus viscidiflorus (Hook.) Nutt. var. elegans (Greene) Blake | Chrysothamnus viscidiflorus ssp. lanceolatus | Asteraceae
|
| CHVIH3 | Chrysothamnus viscidiflorus (Hook.) Nutt. var. humilis (Greene) Jepson | Chrysothamnus humilis | Asteraceae
|
| CHVIL6 | Chrysothamnus viscidiflorus (Hook.) Nutt. var. lanceolatus (Nutt.) Greene | Chrysothamnus viscidiflorus ssp. lanceolatus | Asteraceae
|
| CHVIL7 | Chrysothamnus viscidiflorus (Hook.) Nutt. var. linifolius (Greene) Kittell | Chrysothamnus linifolius | Asteraceae
|
| CHVIL9 | Chrysothamnus viscidiflorus (Hook.) Nutt. var. ludens Shinners | Chrysothamnus spathulatus | Asteraceae
|
| CHVIM2 | Chrysothamnus viscidiflorus (Hook.) Nutt. var. molestus Blake | Chrysothamnus molestus | Asteraceae
|
| CHVIP6 | Chrysothamnus viscidiflorus (Hook.) Nutt. var. puberulus (D.C. Eat.) Jepson | Chrysothamnus viscidiflorus ssp. puberulus | Asteraceae
|
| CHVIP7 | Chrysothamnus viscidiflorus (Hook.) Nutt. var. pumilus (Nutt.) Jepson | Chrysothamnus viscidiflorus ssp. viscidiflorus var. viscidiflorus | Asteraceae
|
| CHVIT2 | Chrysothamnus viscidiflorus (Hook.) Nutt. var. typicus (Hall & Clements) Cronq. | Chrysothamnus viscidiflorus ssp. viscidiflorus var. viscidiflorus | Asteraceae
|
| CHVI8 | Chrysothamnus viscidiflorus (Hook.) Nutt. | yellow rabbitbrush | Asteraceae
|
| CHRYS9 | Chrysothamnus Nutt. | rabbitbrush | Asteraceae
|
| CHPU9 | Chrysothemis pulchella (Donn ex Sims) Dcne. | | Gesneriaceae
|
| CHRYS16 | Chrysothemis Dcne. | chrysothemis | Gesneriaceae
|
| CHCA31 | Chrysothrix candelaris (L.) J. R. Laundon | dust lichen | Chrysotrichaceae
|
| CHCH15 | Chrysothrix chlorina (Ach.) J. R. Laundon | dust lichen | Chrysotrichaceae
|
| CHRYS12 | Chrysothrix Mont. | dust lichen | Chrysotrichaceae
|
| CHGL8 | Chthonia glaucescens Cass. | Pectis glaucescens | Asteraceae
|
| CHAB | Chusquea abietifolia Griseb. | climbing bamboo | Poaceae
|
| CHMO12 | Chusquea montana Phil. | Argentina mountain bamboo | Poaceae
|
| CHUSQ | Chusquea Kunth | chusquea bamboo | Poaceae
|
| CHAR9 | Chylismia arenaria A. Nels. | Camissonia arenaria | Onagraceae
|
| CHLA11 | Chylismia lancifolia Heller | Camissonia claviformis ssp. lancifolia | Onagraceae
|
| CICH | Cibotium chamissoi Kaulfuss | Chamisso's manfern | Dicksoniaceae
|
| CIGL | Cibotium glaucum (Sm.) Hook. & Arn. | hapu'u | Dicksoniaceae
|
| CIHA2 | Cibotium hawaiense Nakai & Ogura | Cibotium chamissoi | Dicksoniaceae
|
| CIME8 | Cibotium menziesii Hook. | hapu'u li | Dicksoniaceae
|
| CINE2 | Cibotium nealiae O. Deg. | Neal's manfern | Dicksoniaceae
|
| CISP2 | Cibotium splendens (Gaud.) Krajina ex Skottsberg | Cibotium chamissoi | Dicksoniaceae
|
| CIST | Cibotium st.-johnii Krajina | Cibotium glaucum | Dicksoniaceae
|
| CIBOT | Cibotium Kaulfuss | manfern | Dicksoniaceae
|
| CIAC2 | Cicca acidua (L.) Merr. | Phyllanthus acidus | Euphorbiaceae
|
| CIDI3 | Cicca disticha L. | Phyllanthus acidus | Euphorbiaceae
|
| CIEX | Cicendia exaltata Griseb. | Centaurium exaltatum | Gentianaceae
|
| CIQU3 | Cicendia quadrangularis (Lam.) Griseb. | Oregon timwort | Gentianaceae
|
| CICEN | Cicendia Adans. | cicendia | Gentianaceae
|
| CIAR5 | Cicer arietinum L. | chick pea | Fabaceae
|
| CILE3 | Cicer lens Willd. | Lens culinaris | Fabaceae
|
| CICER | Cicer L. | cicer | Fabaceae
|
| CIEN | Cichorium endivia L. | cultivated endive | Asteraceae
|
| CIIN | Cichorium intybus L. | chicory | Asteraceae
|
| CICHO | Cichorium L. | chicory | Asteraceae
|
| CIBO | Cicuta bolanderi S. Wats. | Cicuta maculata var. bolanderi | Apiaceae
|
| CIBU | Cicuta bulbifera L. | bulblet-bearing water hemlock | Apiaceae
|
| CICU | Cicuta curtissii Coult. & Rose | Cicuta maculata var. maculata | Apiaceae
|
| CIDO | Cicuta douglasii (DC.) Coult. & Rose | western water hemlock | Apiaceae
|
| CIMA | Cicuta mackenzieana Raup | Cicuta virosa | Apiaceae
|
| CIMAA | Cicuta maculata L. var. angustifolia Hook. | spotted water hemlock | Apiaceae
|
| CIMAB | Cicuta maculata L. var. bolanderi (S. Wats.) Mulligan | spotted water hemlock | Apiaceae
|
| CIMAC | Cicuta maculata L. var. californica (Gray) Boivin | Cicuta douglasii | Apiaceae
|
| CIMAC2 | Cicuta maculata L. var. curtissii (Coult. & Rose) Fern. | Cicuta maculata var. maculata | Apiaceae
|
| CIMAM | Cicuta maculata L. var. maculata | spotted water hemlock | Apiaceae
|
| CIMA2 | Cicuta maculata L. | spotted water hemlock | Apiaceae
|
| CIME2 | Cicuta mexicana Coult. & Rose | Cicuta maculata var. maculata | Apiaceae
|
| CIOC3 | Cicuta occidentalis Greene | Cicuta maculata var. angustifolia | Apiaceae
|
| CIVI5 | Cicuta virosa L. | Mackenzie's water hemlock | Apiaceae
|
| CICUT | Cicuta L. | water hemlock | Apiaceae
|
| CIDR | Cienfuegosia drummondii (Gray) Lewt. | yellow flymallow | Malvaceae
|
| CIHE2 | Cienfuegosia heterophylla (Vent.) Garcke | variableleaf flymallow | Malvaceae
|
| CIYU | Cienfuegosia yucatanensis Millsp. | Yucatan flymallow | Malvaceae
|
| CIENF | Cienfuegosia Cav. | flymallow | Malvaceae
|
| CIAU3 | Ciliaria austromontana (Wieg.) W.A. Weber | Saxifraga bronchialis ssp. austromontana | Saxifragaceae
|
| CIFU | Ciliaria funstonii (Small) W.A. Weber | Saxifraga bronchialis ssp. funstonii | Saxifragaceae
|
| CIVE4 | Ciliaria vespertina (Small) W.A. Weber | Saxifraga bronchialis ssp. vespertina | Saxifragaceae
|
| CIAM | Cimicifuga americana Michx. | mountain bugbane | Ranunculaceae
|
| CIAR | Cimicifuga arizonica S. Wats. | Arizona bugbane | Ranunculaceae
|
| CICO4 | Cimicifuga cordifolia Pursh | Cimicifuga racemosa | Ranunculaceae
|
| CIEL | Cimicifuga elata Nutt. | tall bugbane | Ranunculaceae
|
| CILA | Cimicifuga laciniata S. Wats. | Mt. Hood bugbane | Ranunculaceae
|
| CIRAC | Cimicifuga racemosa (L.) Nutt. var. cordifolia (Pursh) Gray p.p. | Cimicifuga racemosa | Ranunculaceae
|
| CIRAC | Cimicifuga racemosa (L.) Nutt. var. cordifolia (Pursh) Gray p.p. | Cimicifuga rubifolia | Ranunculaceae
|
| CIRA | Cimicifuga racemosa (L.) Nutt. | black bugbane | Ranunculaceae
|
| CIRU | Cimicifuga rubifolia Kearney | Appalachian bugbane | Ranunculaceae
|
| CIMIC | Cimicifuga Wernischeck | bugbane | Ranunculaceae
|
| CIFR2 | Ciminalis fremontii (Torr.) W.A. Weber | Gentiana fremontii | Gentianaceae
|
| CIPR3 | Ciminalis prostrata (Haenke) A.& D. L�ve | Gentiana prostrata | Gentianaceae
|
| CICA17 | Cinchona calisaya Wedd. | quinine | Rubiaceae
|
| CICA14 | Cinchona caribaea Jacq. | Exostema caribaeum | Rubiaceae
|
| CILE4 | Cinchona ledgeriana Moens ex Trimen | Cinchona calisaya | Rubiaceae
|
| CIOF | Cinchona officinalis L. | quinine | Rubiaceae
|
| CIPU | Cinchona pubescens Vahl | quinine | Rubiaceae
|
| CISU2 | Cinchona succirubra Pavon ex Klotzsch | Cinchona pubescens | Rubiaceae
|
| CINCH | Cinchona L. | cinchona | Rubiaceae
|
| CIAR70 | Cinclidium arcticum Bruch & Schimp. in B.S.G. | arctic cinclidium moss | Mniaceae
|
| CILA70 | Cinclidium latifolium Lindb. | wideleaf cinclidium moss | Mniaceae
|
| CIST70 | Cinclidium stygium Sw. in Schrad. | cinclidium moss | Mniaceae
|
| CISU70 | Cinclidium subrotundum Lindb. | cinclidium moss | Mniaceae
|
| CINCL2 | Cinclidium Sw. in Schrad. | cinclidium moss | Mniaceae
|
| CICO8 | Cineraria congesta R. Br. | Senecio congestus | Asteraceae
|
| CIMU3 | Cineraria multiflora L'Herit. | | Asteraceae
|
| CISA3 | Cineraria salicifolia Kunth | Barkleyanthus salicifolius | Asteraceae
|
| CISA4 | Cineraria saxifraga D.C. | wild cineraria | Asteraceae
|
| CINER | Cineraria L. | cineraria | Asteraceae
|
| CIAR10 | Cinna arkansana (Nutt.) G. Tucker | Limnodea arkansana | Poaceae
|
| CIARI | Cinna arundinacea L. var. inexpansa Fern. & Grisc. | Cinna arundinacea | Poaceae
|
| CIAR2 | Cinna arundinacea L. | sweet woodreed | Poaceae
|
| CIBO2 | Cinna bolanderi Scribn. | Bolander's woodreed | Poaceae
|
| CIGL2 | Cinna glomerata Walt. | Andropogon glomeratus var. glomeratus | Poaceae
|