| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| COLA5 | Coreopsis lanceolata L. | lanceleaf tickseed | Asteraceae
|
| COLA7 | Coreopsis latifolia Michx. | broadleaf tickseed | Asteraceae
|
| COLEC | Coreopsis leavenworthii Torr. & Gray var. curtissii Sherff | Coreopsis leavenworthii | Asteraceae
|
| COLEG | Coreopsis leavenworthii Torr. & Gray var. garberi Gray | Coreopsis leavenworthii | Asteraceae
|
| COLEL | Coreopsis leavenworthii Torr. & Gray var. lewtonii (Small) Sherff | Coreopsis leavenworthii | Asteraceae
|
| COLE3 | Coreopsis leavenworthii Torr. & Gray | Leavenworth's tickseed | Asteraceae
|
| COLE4 | Coreopsis lewtonii Small | Coreopsis leavenworthii | Asteraceae
|
| COLI5 | Coreopsis linifolia Nutt. | Texas tickseed | Asteraceae
|
| COLOG2 | Coreopsis longifolia Small var. godfreyi Sherff | Coreopsis gladiata | Asteraceae
|
| COLO7 | Coreopsis longifolia Small | Coreopsis gladiata | Asteraceae
|
| COLO9 | Coreopsis longipes Hook. | Coreopsis grandiflora var. longipes | Asteraceae
|
| COMAL | Coreopsis major Walt. var. linearis Small | Coreopsis delphiniifolia | Asteraceae
|
| COMAO2 | Coreopsis major Walt. var. oemleri (Ell.) Britt. ex Small & Vail | Coreopsis major | Asteraceae
|
| COMAR4 | Coreopsis major Walt. var. rigida (Nutt.) Boynt. | Coreopsis major | Asteraceae
|
| COMAS | Coreopsis major Walt. var. stellata (Nutt.) B.L. Robins. | Coreopsis major | Asteraceae
|
| COMA6 | Coreopsis major Walt. | greater tickseed | Asteraceae
|
| COMA10 | Coreopsis maritima (Nutt.) Hook. f. | sea dahlia | Asteraceae
|
| CONE6 | Coreopsis newberryi Gray | Coreopsis californica var. newberryi | Asteraceae
|
| CONU5 | Coreopsis nudata Nutt. | Georgia tickseed | Asteraceae
|
| CONU3 | Coreopsis nuecensis Heller | crown tickseed | Asteraceae
|
| CONU6 | Coreopsis nuecensoides E.B. Sm. | Rio Grande tickseed | Asteraceae
|
| COONS | Coreopsis oniscicarpa Fern. var. simulans Fern. | Coreopsis linifolia | Asteraceae
|
| COON | Coreopsis oniscicarpa Fern. | Coreopsis linifolia | Asteraceae
|
| COPA10 | Coreopsis palmata Nutt. | stiff tickseed | Asteraceae
|
| COPA19 | Coreopsis parviflora Jacq. | Cosmos parviflorus | Asteraceae
|
| COPUD | Coreopsis pubescens Ell. var. debilis (Sherff) E.B. Sm. | star tickseed | Asteraceae
|
| COPUP | Coreopsis pubescens Ell. var. pubescens | star tickseed | Asteraceae
|
| COPUR | Coreopsis pubescens Ell. var. robusta Gray ex Eames | star tickseed | Asteraceae
|
| COPU2 | Coreopsis pubescens Ell. | star tickseed | Asteraceae
|
| COPU9 | Coreopsis pulchra Boynt. | woodland tickseed | Asteraceae
|
| CORE9 | Coreopsis reptans L. | Bidens reptans var. reptans | Asteraceae
|
| CORO | Coreopsis rosea Nutt. | pink tickseed | Asteraceae
|
| COSAD | Coreopsis saxicola Alexander var. duncanii Sherff | Coreopsis grandiflora var. saxicola | Asteraceae
|
| COSA5 | Coreopsis saxicola Alexander | Coreopsis grandiflora var. saxicola | Asteraceae
|
| COSA7 | Coreopsis saxicoloidea Sherff | Coreopsis linifolia | Asteraceae
|
| COSI7 | Coreopsis similis Boynt. | Coreopsis tinctoria var. similis | Asteraceae
|
| COST11 | Coreopsis stenophylla Boynt. | Coreopsis tinctoria var. tinctoria | Asteraceae
|
| COSTJ | Coreopsis stillmanii (Gray) Blake var. jonesii Sherff | Coreopsis douglasii | Asteraceae
|
| COST3 | Coreopsis stillmanii (Gray) Blake | Stillman's tickseed | Asteraceae
|
| COTIA | Coreopsis tinctoria Nutt. var. atkinsoniana (Dougl. ex Lindl.) H.M. Parker ex E.B. Sm. | Atkinson's tickseed | Asteraceae
|
| COTII | Coreopsis tinctoria Nutt. var. imminuta Sherff | Coreopsis tinctoria var. tinctoria | Asteraceae
|
| COTIS | Coreopsis tinctoria Nutt. var. similis (Boynt.) H.M. Parker | golden tickseed | Asteraceae
|
| COTIT | Coreopsis tinctoria Nutt. var. tinctoria | golden tickseed | Asteraceae
|
| COTI3 | Coreopsis tinctoria Nutt. | golden tickseed | Asteraceae
|
| COTRD | Coreopsis tripteris L. var. deamii Standl. | Coreopsis tripteris | Asteraceae
|
| COTRI | Coreopsis tripteris L. var. intercedens Standl. | Coreopsis tripteris | Asteraceae
|
| COTRS | Coreopsis tripteris L. var. smithii Sherff | Coreopsis tripteris | Asteraceae
|
| COTRS2 | Coreopsis tripteris L. var. subrhomboidea Sherff | Coreopsis tripteris | Asteraceae
|
| COTR4 | Coreopsis tripteris L. | tall tickseed | Asteraceae
|
| COVE5 | Coreopsis verticillata L. | whorled tickseed | Asteraceae
|
| COWR3 | Coreopsis wrightii (Gray) H.M. Parker | rock tickseed | Asteraceae
|
| COREO2 | Coreopsis L. | tickseed | Asteraceae
|
| COCAC5 | Corethrogyne californica DC. var. californica | California sandaster | Asteraceae
|
| COCAL | Corethrogyne californica DC. var. lyonii Blake | California sandaster | Asteraceae
|
| COCAO | Corethrogyne californica DC. var. obovata (Benth.) Kuntze | California sandaster | Asteraceae
|
| COCA11 | Corethrogyne californica DC. | California sandaster | Asteraceae
|
| COFIB | Corethrogyne filaginifolia (Hook. & Arn.) Nutt. var. bernardina (Abrams) Hall | common sandaster | Asteraceae
|
| COFIB2 | Corethrogyne filaginifolia (Hook. & Arn.) Nutt. var. brevicula (Greene) Canby | Corethrogyne filaginifolia var. glomerata | Asteraceae
|
| COFIF | Corethrogyne filaginifolia (Hook. & Arn.) Nutt. var. filaginifolia | common sandaster | Asteraceae
|
| COFIG | Corethrogyne filaginifolia (Hook. & Arn.) Nutt. var. glomerata Hall | common sandaster | Asteraceae
|
| COFIH | Corethrogyne filaginifolia (Hook. & Arn.) Nutt. var. hamiltonensis Keck | common sandaster | Asteraceae
|
| COFII | Corethrogyne filaginifolia (Hook. & Arn.) Nutt. var. incana (Nutt.) Canby | San Diego sandaster | Asteraceae
|
| COFIL | Corethrogyne filaginifolia (Hook. & Arn.) Nutt. var. latifolia Hall | common sandaster | Asteraceae
|
| COFIL2 | Corethrogyne filaginifolia (Hook. & Arn.) Nutt. var. linifolia Hall | Del Mar Mesa sandaster | Asteraceae
|
| COFIP | Corethrogyne filaginifolia (Hook. & Arn.) Nutt. var. peirsonii Canby | common sandaster | Asteraceae
|
| COFIP2 | Corethrogyne filaginifolia (Hook. & Arn.) Nutt. var. pinetorum I.M. Johnston | common sandaster | Asteraceae
|
| COFIR2 | Corethrogyne filaginifolia (Hook. & Arn.) Nutt. var. rigida Gray | Corethrogyne filaginifolia var. virgata | Asteraceae
|
| COFIR | Corethrogyne filaginifolia (Hook. & Arn.) Nutt. var. robusta Greene | common sandaster | Asteraceae
|
| COFIS | Corethrogyne filaginifolia (Hook. & Arn.) Nutt. var. sessilis (Greene) Canby | common sandaster | Asteraceae
|
| COFIV | Corethrogyne filaginifolia (Hook. & Arn.) Nutt. var. virgata (Benth.) Gray | common sandaster | Asteraceae
|
| COFIV2 | Corethrogyne filaginifolia (Hook. & Arn.) Nutt. var. viscidula (Greene) Keck | common sandaster | Asteraceae
|
| COFI2 | Corethrogyne filaginifolia (Hook. & Arn.) Nutt. | common sandaster | Asteraceae
|
| COFL8 | Corethrogyne flagellaris Greene | Corethrogyne filaginifolia var. latifolia | Asteraceae
|
| COFL9 | Corethrogyne floccosa Greene | Corethrogyne filaginifolia var. virgata | Asteraceae
|
| COIN8 | Corethrogyne incana Nutt. | Corethrogyne filaginifolia var. incana | Asteraceae
|
| COLE2 | Corethrogyne leucophylla (Lindl.) Jepson | whiteleaf sandaster | Asteraceae
|
| COLI9 | Corethrogyne linifolia (Hall) Ferris | Corethrogyne filaginifolia var. linifolia | Asteraceae
|
| COOB8 | Corethrogyne obovata Benth. | Corethrogyne californica var. obovata | Asteraceae
|
| COSC8 | Corethrogyne scabra Greene | Corethrogyne filaginifolia var. viscidula | Asteraceae
|
| COSE15 | Corethrogyne sessilis Greene | Corethrogyne filaginifolia var. sessilis | Asteraceae
|
| COTO3 | Corethrogyne tomentella (Hook. & Arn.) Torr. & Gray | Corethrogyne filaginifolia var. filaginifolia | Asteraceae
|
| COVI14 | Corethrogyne viscidula Greene | Corethrogyne filaginifolia var. viscidula | Asteraceae
|
| CORET | Corethrogyne DC. | sandaster | Asteraceae
|
| COSA | Coriandrum sativum L. | coriander | Apiaceae
|
| CORIA | Coriandrum L. | coriander | Apiaceae
|
| COCI | Coridochloa cimicina (L.) Nees ex Chase | Alloteropsis cimicina | Poaceae
|
| COAD2 | Coriflora addisonii (Britt.) W.A. Weber | Clematis addisonii | Ranunculaceae
|
| COAL7 | Coriflora albicoma (Wherry) W.A. Weber | Clematis albicoma | Ranunculaceae
|
| COBA7 | Coriflora baldwinii (Torr. & Gray) W.A. Weber | Clematis baldwinii var. baldwinii | Ranunculaceae
|
| COBE5 | Coriflora beadlei (Small) W.A. Weber | Clematis viorna | Ranunculaceae
|
| COBI4 | Coriflora bigelovii (Torr.) W.A. Weber | Clematis bigelovii | Ranunculaceae
|
| COCR3 | Coriflora crispa (L.) W.A. Weber | Clematis crispa | Ranunculaceae
|
| COFR4 | Coriflora fremontii (S. Wats.) W.A. Weber | Clematis fremontii | Ranunculaceae
|
| COGA2 | Coriflora gattingeri (Small) W.A. Weber | Clematis viorna | Ranunculaceae
|
| COGL10 | Coriflora glaucophylla (Small) W.A. Weber | Clematis glaucophylla | Ranunculaceae
|
| COHI5 | Coriflora hirsutissima (Pursh) W.A. Weber | Clematis hirsutissima var. hirsutissima | Ranunculaceae
|
| COMO12 | Coriflora morefieldii (Kral) W.A. Weber | Clematis morefieldii | Ranunculaceae
|
| COOC4 | Coriflora ochroleuca (Ait.) W.A. Weber | Clematis ochroleuca | Ranunculaceae
|
| COPA25 | Coriflora palmeri (Rose) W.A. Weber | Clematis palmeri | Ranunculaceae
|
| COPI6 | Coriflora pitcheri (Torr. & Gray) W.A. Weber | Clematis pitcheri var. pitcheri | Ranunculaceae
|
| CORE6 | Coriflora reticulata (Walt.) W.A. Weber | Clematis reticulata | Ranunculaceae
|