| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| COMAC | Cordylanthus maritimus Nutt. ex Benth. ssp. canescens (Gray) Chuang & Heckard | saltmarsh bird's-beak | Scrophulariaceae
|
| COMAM3 | Cordylanthus maritimus Nutt. ex Benth. ssp. maritimus | saltmarsh bird's-beak | Scrophulariaceae
|
| COMAP | Cordylanthus maritimus Nutt. ex Benth. ssp. palustris (Behr) Chuang & Heckard | Pt. Reyes bird's-beak | Scrophulariaceae
|
| COMAC3 | Cordylanthus maritimus Nutt. ex Benth. var. canescens (Gray) Jepson | Cordylanthus maritimus ssp. canescens | Scrophulariaceae
|
| COMA5 | Cordylanthus maritimus Nutt. ex Benth. | saltmarsh bird's-beak | Scrophulariaceae
|
| COMOH | Cordylanthus mollis Gray ssp. hispidus (Pennell) Chuang & Heckard | hispid bird's-beak | Scrophulariaceae
|
| COMOM | Cordylanthus mollis Gray ssp. mollis | soft bird's-beak | Scrophulariaceae
|
| COMO | Cordylanthus mollis Gray | soft bird's-beak | Scrophulariaceae
|
| CONE5 | Cordylanthus nevadensis Edwin | Cordylanthus capitatus | Scrophulariaceae
|
| CONE | Cordylanthus nevinii Gray | Nevin's bird's-beak | Scrophulariaceae
|
| CONI2 | Cordylanthus nidularius J.T. Howell | Mt. Diablo bird's-beak | Scrophulariaceae
|
| COOR7 | Cordylanthus orcuttianus Gray | Orcutt's bird's-beak | Scrophulariaceae
|
| COPA7 | Cordylanthus pallescens Pennell | Cordylanthus tenuis ssp. pallescens | Scrophulariaceae
|
| COPAC2 | Cordylanthus palmatus (Ferris) J.F. Macbr. ssp. carnulosus (Pennell) Munz | Cordylanthus palmatus | Scrophulariaceae
|
| COPA8 | Cordylanthus palmatus (Ferris) J.F. Macbr. | palmbract bird's-beak | Scrophulariaceae
|
| COPA9 | Cordylanthus parviflorus (Ferris) Wiggins | purple bird's-beak | Scrophulariaceae
|
| COPIB | Cordylanthus pilosus Gray ssp. bolanderi (Gray) Munz | Cordylanthus tenuis ssp. tenuis | Scrophulariaceae
|
| COPID | Cordylanthus pilosus Gray ssp. diffusus (Pennell) Munz | Cordylanthus pilosus ssp. pilosus | Scrophulariaceae
|
| COPIH | Cordylanthus pilosus Gray ssp. hansenii (Ferris) Chuang & Heckard | Hansen's bird's beak | Scrophulariaceae
|
| COPIP | Cordylanthus pilosus Gray ssp. pilosus | hairy bird's beak | Scrophulariaceae
|
| COPIT | Cordylanthus pilosus Gray ssp. trifidus (Robins. & Greenm.) Chuang & Heckard | hairy bird's beak | Scrophulariaceae
|
| COPIT2 | Cordylanthus pilosus Gray var. trifidus Robins. & Greenm. | Cordylanthus pilosus ssp. trifidus | Scrophulariaceae
|
| COPI2 | Cordylanthus pilosus Gray | hairy bird's-beak | Scrophulariaceae
|
| COPL2 | Cordylanthus platycephalus Pennell | Cordylanthus rigidus ssp. rigidus | Scrophulariaceae
|
| COPR | Cordylanthus pringlei Gray | Pringle's bird's beak | Scrophulariaceae
|
| CORAE | Cordylanthus ramosus Nutt. ex Benth. ssp. eremicus (Coville & Morton) Munz | Cordylanthus eremicus ssp. eremicus | Scrophulariaceae
|
| CORAS | Cordylanthus ramosus Nutt. ex Benth. ssp. setosus Pennell | Cordylanthus ramosus | Scrophulariaceae
|
| CORAP | Cordylanthus ramosus Nutt. ex Benth. var. puberulus J.F. Macbr. | Cordylanthus ramosus | Scrophulariaceae
|
| CORA5 | Cordylanthus ramosus Nutt. ex Benth. | bushy bird's beak | Scrophulariaceae
|
| CORIB | Cordylanthus rigidus (Benth.) Jepson ssp. brevibracteatus (Gray) Munz | stiffbranch bird's beak | Scrophulariaceae
|
| CORIL | Cordylanthus rigidus (Benth.) Jepson ssp. littoralis (Ferris) Chuang & Heckard | seaside bird's beak | Scrophulariaceae
|
| CORIR | Cordylanthus rigidus (Benth.) Jepson ssp. rigidus | stiffbranch bird's beak | Scrophulariaceae
|
| CORIS2 | Cordylanthus rigidus (Benth.) Jepson ssp. setigerus Chuang & Heckard | stiffbranch bird's beak | Scrophulariaceae
|
| CORIL2 | Cordylanthus rigidus (Benth.) Jepson var. littoralis (Ferris) Jepson | Cordylanthus rigidus ssp. littoralis | Scrophulariaceae
|
| CORI2 | Cordylanthus rigidus (Benth.) Jepson | stiffbranch bird's beak | Scrophulariaceae
|
| COTE2 | Cordylanthus tecopensis Munz & Roos | Tecopa bird's beak | Scrophulariaceae
|
| COTE7 | Cordylanthus tenuifolius Pennell | Cordylanthus wrightii ssp. tenuifolius | Scrophulariaceae
|
| COTEB2 | Cordylanthus tenuis Gray ssp. barbatus Chuang & Heckard | Fresno County bird's beak | Scrophulariaceae
|
| COTEB | Cordylanthus tenuis Gray ssp. brunneus (Jepson) Munz | serpentine bird's beak | Scrophulariaceae
|
| COTEC | Cordylanthus tenuis Gray ssp. capillaris (Pennell) Chuang & Heckard | Pennell's bird's beak | Scrophulariaceae
|
| COTEP2 | Cordylanthus tenuis Gray ssp. pallescens (Pennell) Chuang & Heckard | pallid bird's beak | Scrophulariaceae
|
| COTET2 | Cordylanthus tenuis Gray ssp. tenuis | slender bird's beak | Scrophulariaceae
|
| COTEV | Cordylanthus tenuis Gray ssp. viscidus (T.J. Howell) Chuang & Heckard | slender bird's beak | Scrophulariaceae
|
| COTE3 | Cordylanthus tenuis Gray | slender bird's beak | Scrophulariaceae
|
| COVI4 | Cordylanthus viscidus (T.J. Howell) Pennell ex M.E. Peck | Cordylanthus tenuis ssp. viscidus | Scrophulariaceae
|
| COWRK | Cordylanthus wrightii Gray ssp. kaibabensis Chuang & Heckard | Kaibab bird's beak | Scrophulariaceae
|
| COWRT | Cordylanthus wrightii Gray ssp. tenuifolius (Pennell) Chuang & Heckard | Wright's bird's beak | Scrophulariaceae
|
| COWRW | Cordylanthus wrightii Gray ssp. wrightii | Wright's bird's beak | Scrophulariaceae
|
| COWRP | Cordylanthus wrightii Gray var. pauciflorus Kearney & Peebles | Cordylanthus wrightii ssp. wrightii | Scrophulariaceae
|
| COWR2 | Cordylanthus wrightii Gray | Wright's bird's beak | Scrophulariaceae
|
| CORDY | Cordylanthus Nutt. ex Benth. | bird's-beak | Scrophulariaceae
|
| COAU12 | Cordyline australis (G. Forst.) Endl. | cabbage tree | Liliaceae
|
| COBA14 | Cordyline banksii Hook. f. | ti ngahere | Liliaceae
|
| COFR2 | Cordyline fruticosa (L.) Chev. | tiplant | Liliaceae
|
| COGU2 | Cordyline guineensis (L.) Britt. | Sansevieria hyacinthoides | Agavaceae
|
| COTET3 | Cordyline terminalis (L.) Kunth var. ti (Schott) Baker | Cordyline fruticosa | Liliaceae
|
| COTE12 | Cordyline terminalis (L.) Kunth | Cordyline fruticosa | Liliaceae
|
| CORDY2 | Cordyline Comm. ex R. Br. | cordyline | Liliaceae
|
| COCO9 | Corema conradii (Torr.) Torr. ex Loud. | broom crowberry | Empetraceae
|
| COREM | Corema D. Don | corema | Empetraceae
|
| COAR5 | Coreocarpus arizonicus (Gray) Blake | little lemonhead | Asteraceae
|
| COREO | Coreocarpus Benth. | coreocarpus | Asteraceae
|
| COAN10 | Coreopsis angustata Greene | Coreopsis leavenworthii | Asteraceae
|
| COAN9 | Coreopsis angustifolia Ait., non L. | Coreopsis gladiata | Asteraceae
|
| COAT3 | Coreopsis atkinsoniana Dougl. ex Lindl. | Coreopsis tinctoria var. atkinsoniana | Asteraceae
|
| COAU6 | Coreopsis aurea Ait. | Bidens aurea | Asteraceae
|
| COAU | Coreopsis auriculata L. | lobed tickseed | Asteraceae
|
| COBAW | Coreopsis basalis (A. Dietr.) Blake var. wrightii (Gray) Blake | Coreopsis wrightii | Asteraceae
|
| COBA2 | Coreopsis basalis (A. Dietr.) Blake | goldenmane tickseed | Asteraceae
|
| COBI | Coreopsis bigelovii (Gray) Hall | Bigelow's tickseed | Asteraceae
|
| COCAC4 | Coreopsis californica (Nutt.) H.K. Sharsmith var. californica | California tickseed | Asteraceae
|
| COCAN | Coreopsis californica (Nutt.) H.K. Sharsmith var. newberryi (Gray) E.B. Sm. | Newberry's tickseed | Asteraceae
|
| COCA8 | Coreopsis californica (Nutt.) H.K. Sharsmith | California tickseed | Asteraceae
|
| COCA9 | Coreopsis calliopsidea (DC.) Gray | leafstem tickseed | Asteraceae
|
| COCA12 | Coreopsis cardaminefolia (DC.) Torr. & Gray | Coreopsis tinctoria var. tinctoria | Asteraceae
|
| COCO22 | Coreopsis corninsularis Sherff | Coreopsis pubescens var. debilis | Asteraceae
|
| COCR5 | Coreopsis crassifolia Ait. | Coreopsis lanceolata | Asteraceae
|
| CODE6 | Coreopsis debilis Sherff | Coreopsis pubescens var. debilis | Asteraceae
|
| CODEC2 | Coreopsis delphiniifolia Lam. var. chlooidea Sherff | Coreopsis delphiniifolia | Asteraceae
|
| CODE3 | Coreopsis delphiniifolia Lam. | larkspurleaf tickseed | Asteraceae
|
| CODO2 | Coreopsis douglasii (DC.) Hall | Douglas' tickseed | Asteraceae
|
| CODRW | Coreopsis drummondii (D. Don) Torr. & Gray var. wrightii Gray | Coreopsis wrightii | Asteraceae
|
| CODR3 | Coreopsis drummondii (D. Don) Torr. & Gray | Coreopsis basalis | Asteraceae
|
| COFA | Coreopsis falcata Boynt. | sickle tickseed | Asteraceae
|
| COFE3 | Coreopsis ferulifolia Jacq. | Bidens ferulifolia | Asteraceae
|
| COFL6 | Coreopsis floridana E.B. Sm. | Florida tickseed | Asteraceae
|
| COGI | Coreopsis gigantea (Kellogg) Hall | giant coreopsis | Asteraceae
|
| COGLL | Coreopsis gladiata Walt. var. linifolia (Nutt.) Cronq. | Coreopsis linifolia | Asteraceae
|
| COGL2 | Coreopsis gladiata Walt. | coastalplain tickseed | Asteraceae
|
| COGRG | Coreopsis grandiflora Hogg ex Sweet var. grandiflora | largeflower tickseed | Asteraceae
|
| COGRH | Coreopsis grandiflora Hogg ex Sweet var. harveyana (Gray) Sherff | largeflower tickseed | Asteraceae
|
| COGRL | Coreopsis grandiflora Hogg ex Sweet var. longipes (Hook.) Torr. & Gray | largeflower tickseed | Asteraceae
|
| COGRP2 | Coreopsis grandiflora Hogg ex Sweet var. pilosa Sherff | Coreopsis grandiflora var. grandiflora | Asteraceae
|
| COGRS | Coreopsis grandiflora Hogg ex Sweet var. saxicola (Alexander) E.B. Sm. | largeflower tickseed | Asteraceae
|
| COGR5 | Coreopsis grandiflora Hogg ex Sweet | largeflower tickseed | Asteraceae
|
| COHA2 | Coreopsis hamiltonii (Elmer) H.K. Sharsmith | Mt. Hamilton tickseed | Asteraceae
|
| COHE11 | Coreopsis helianthoides Beadle | Coreopsis gladiata | Asteraceae
|
| COHE7 | Coreopsis heterogyna Fern. | Coreopsis lanceolata | Asteraceae
|
| COHE8 | Coreopsis heterolepis Sherff | Coreopsis grandiflora var. harveyana | Asteraceae
|
| COIN4 | Coreopsis integrifolia Poir. | fringeleaf tickseed | Asteraceae
|
| COIN2 | Coreopsis intermedia Sherff | goldenwave tickseed | Asteraceae
|