| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| CENAN | Centaurium namophilum Reveal, Broome & Beatley var. nevadense Broome | Centaurium exaltatum | Gentianaceae
|
| CENA | Centaurium namophilum Reveal, Broome & Beatley | springloving centaury | Gentianaceae
|
| CENU | Centaurium nudicaule (Engelm.) B.L. Robins. | Santa Catalina Mountain centaury | Gentianaceae
|
| CENU3 | Centaurium nuttallii (S. Wats.) Heller | Centaurium exaltatum | Gentianaceae
|
| CEPU3 | Centaurium pulchellum (Sw.) Druce | branched centaury | Gentianaceae
|
| CEQU | Centaurium quitense (Kunth) B.L. Robins. | Britton's centaury | Gentianaceae
|
| CESE6 | Centaurium sebaeoides (Griseb.) Druce | lavaslope centaury | Gentianaceae
|
| CESP3 | Centaurium spicatum (L.) Fritsch | spiked centaury | Gentianaceae
|
| CETE2 | Centaurium texense (Griseb.) Fern. | Lady Bird's centaury | Gentianaceae
|
| CETR2 | Centaurium trichanthum (Griseb.) B.L. Robins. | alkali centaury | Gentianaceae
|
| CEUM | Centaurium umbellatum auct. non Gilib. | Centaurium erythraea | Gentianaceae
|
| CEVEA | Centaurium venustum (Gray) B.L. Robins. ssp. abramsii Munz | charming centaury | Gentianaceae
|
| CEVEV | Centaurium venustum (Gray) B.L. Robins. ssp. venustum | charming centaury | Gentianaceae
|
| CEVE3 | Centaurium venustum (Gray) B.L. Robins. | charming centaury | Gentianaceae
|
| CENTA2 | Centaurium Hill | centaury | Gentianaceae
|
| CEAS | Centella asiatica (L.) Urban | spadeleaf | Apiaceae
|
| CEER2 | Centella erecta (L. f.) Fern. | erect centella | Apiaceae
|
| CERE5 | Centella repanda (Pers.) Small | Centella erecta | Apiaceae
|
| CENTE | Centella L. | centella | Apiaceae
|
| CEMI5 | Centipeda minima (L.) A. Braun & Aschers. | spreading sneezeweed | Asteraceae
|
| CENTI | Centipeda Lour. | centipeda | Asteraceae
|
| CELA9 | Centotheca lappacea (L.) Desv. | | Poaceae
|
| CENTO | Centotheca Desv. | | Poaceae
|
| CERU2 | Centranthus ruber (L.) DC. | red valerian | Valerianaceae
|
| CENTR | Centranthus Neck. ex Lam. & DC. | centranthus | Valerianaceae
|
| CEPU6 | Centratherum punctatum Cass. | larkdaisy | Asteraceae
|
| CENTR6 | Centratherum Cass. | centratherum | Asteraceae
|
| CESE3 | Centrogenium setaceum (Lindl.) Schlechter | Eltroplectris calcarata | Orchidaceae
|
| CEAR5 | Centrosema arenicola (Small) F.J. Herm. | pineland butterfly pea | Fabaceae
|
| CEFL3 | Centrosema floridanum (Britt.) Lakela | Centrosema arenicola | Fabaceae
|
| CEMO5 | Centrosema molle Mart. ex Benth. | | Fabaceae
|
| CEPL | Centrosema plumieri (Turp. ex Pers.) Benth. | feefee | Fabaceae
|
| CEPU5 | Centrosema pubescens Benth. | flor de conchitas | Fabaceae
|
| CESA6 | Centrosema sagittatum (Willd.) Brandeg. ex Riley | arrowleaf butterfly pea | Fabaceae
|
| CEVIE | Centrosema virginianum (L.) Benth. var. ellipticum (DC.) Fern. | Centrosema virginianum | Fabaceae
|
| CEVI2 | Centrosema virginianum (L.) Benth. | spurred butterfly pea | Fabaceae
|
| CENTR2 | Centrosema (DC.) Benth. | butterfly pea | Fabaceae
|
| CEAS3 | Centrostachys aspera (L.) Standl. | Achyranthes aspera var. aspera | Amaranthaceae
|
| CEIN6 | Centrostachys indica (L.) Standl. | Achyranthes aspera var. aspera | Amaranthaceae
|
| CEIN5 | Centrostegia insignis (Curran) Heller | Aristocapsa insignis | Polygonaceae
|
| CELE4 | Centrostegia leptoceras Gray ex Benth. | Dodecahema leptoceras | Polygonaceae
|
| CETHM | Centrostegia thurberi Gray ex Benth. var. macrotheca (J.T. Howell) Goodman | Centrostegia thurberi | Polygonaceae
|
| CETH3 | Centrostegia thurberi Gray ex Benth. | red triangles | Polygonaceae
|
| CEVO | Centrostegia vortriedei (Brandeg.) Goodman | Systenotheca vortriedei | Polygonaceae
|
| CENTR4 | Centrostegia Gray ex Benth. | centrostegia | Polygonaceae
|
| CEMI | Centunculus minimus L. | Anagallis minima | Primulaceae
|
| CEUM2 | Ceodes umbellifera J.R. & G. Forst. | Pisonia umbellifera | Nyctaginaceae
|
| CEIP | Cephaelis ipecacuanha (Brot.) Tussac | ipecac | Rubiaceae
|
| CEPHA9 | Cephaelis Sw. | cephaelis | Rubiaceae
|
| CEAU | Cephalanthera austiniae (Gray) Heller | phantom orchid | Orchidaceae
|
| CEPHA3 | Cephalanthera L.C. Rich. | cephalanthera | Orchidaceae
|
| CEOCC2 | Cephalanthus occidentalis L. var. californicus Benth. | Cephalanthus occidentalis | Rubiaceae
|
| CEOCP2 | Cephalanthus occidentalis L. var. pubescens Raf. | Cephalanthus occidentalis | Rubiaceae
|
| CEOC2 | Cephalanthus occidentalis L. | common buttonbush | Rubiaceae
|
| CESA3 | Cephalanthus salicifolius Humb. & Bonpl. | Mexican buttonbush | Rubiaceae
|
| CEPHA | Cephalanthus L. | buttonbush | Rubiaceae
|
| CEGI2 | Cephalaria gigantea (Ledeb.) Bobr. | Tatarian cephalaria | Dipsacaceae
|
| CESY | Cephalaria syriaca (L.) Scrad. ex Roemer & J.A. Schultes | Syrian cephalaria | Dipsacaceae
|
| CETA | Cephalaria tatarica auct. non Roemer & J.A. Schultes | Cephalaria gigantea | Dipsacaceae
|
| CEPHA4 | Cephalaria Schrad. ex Roemer & J.A. Schultes | cephalaria | Dipsacaceae
|
| CEDE9 | Cephalocereus deeringii Small | Pilosocereus robinii var. deeringii | Cactaceae
|
| CEKE2 | Cephalocereus keyensis Britt. & Rose | Pilosocereus robinii var. robinii | Cactaceae
|
| CENO2 | Cephalocereus nobilis (Haw.) Britt. & Rose | Pilosocereus royenii | Cactaceae
|
| CERO2 | Cephalocereus royenii (L.) Britt. & Rose | Pilosocereus royenii | Cactaceae
|
| CEPHA10 | Cephalocereus Pfeiff. | cephalocereus | Cactaceae
|
| CEPO6 | Cephalonema polyandrum Schumann ex Sprague | Clappertonia polyandra | Tiliaceae
|
| CELE5 | Cephalophysis leucospila (Anzi) R. Kilias & Scheid. | | Teloschistaceae
|
| CEPHA7 | Cephalophysis (Hertel) Kilias | cephalophysis | Teloschistaceae
|
| CEHA2 | Cephalotaxus harringtonia (Knight ex Forbes) K. Koch | Harrington's cephalotaxus | Cephalotaxaceae
|
| CEPHA8 | Cephalotaxus Siebold & Zucc. ex Endl. | cephalotaxus | Cephalotaxaceae
|
| CEAF2 | Cephalozia affinis Lindb. ex Steph. | | Cephaloziaceae
|
| CEBIA | Cephalozia bicuspidata (L.) Dumort. ssp. ambigua (C. Massal.) R. M. Schust. | | Cephaloziaceae
|
| CEBIB | Cephalozia bicuspidata (L.) Dumort. ssp. bicuspidata [autonym] | | Cephaloziaceae
|
| CEBIL | Cephalozia bicuspidata (L.) Dumort. ssp. lammersiana (Huebener) R. M. Schust. | | Cephaloziaceae
|
| CEBIO | Cephalozia bicuspidata (L.) Dumort. ssp. otaruensis (Steph.) S. Hatt. | | Cephaloziaceae
|
| CEBI4 | Cephalozia bicuspidata (L.) Dumort. | | Cephaloziaceae
|
| CECA15 | Cephalozia catenulata (Huebener) Lindb. | | Cephaloziaceae
|
| CECOB | Cephalozia connivens (Dicks.) Lindb. var. bifida R. M. Schust. | | Cephaloziaceae
|
| CECOC2 | Cephalozia connivens (Dicks.) Lindb. var. compacta (Warnst.) Nichols | | Cephaloziaceae
|
| CECOC | Cephalozia connivens (Dicks.) Lindb. var. connivens | | Cephaloziaceae
|
| CECO7 | Cephalozia connivens (Dicks.) Lindb. | | Cephaloziaceae
|
| CELA6 | Cephalozia lacinulata J. B. Jack ex Spruce | | Cephaloziaceae
|
| CELE6 | Cephalozia leucantha Spruce | | Cephaloziaceae
|
| CELO4 | Cephalozia loitlesbergeri Schiffn. | | Cephaloziaceae
|
| CELU | Cephalozia lunulifolia (Dumort.) Dumort. | | Cephaloziaceae
|
| CEMA14 | Cephalozia macounii (Austin) Austin | | Cephaloziaceae
|
| CEMAA | Cephalozia macrostachya Kaal. ssp. australis R. M. Schust. | | Cephaloziaceae
|
| CEMAM | Cephalozia macrostachya Kaal. ssp. macrostachya | | Cephaloziaceae
|
| CEMA15 | Cephalozia macrostachya Kaal. | | Cephaloziaceae
|
| CEPA19 | Cephalozia pachycaulis R. M. Schust. | | Cephaloziaceae
|
| CEPLC | Cephalozia pleniceps (Austin) Lindb. var. caroliniana R. M. Schust. | | Cephaloziaceae
|
| CEPLP | Cephalozia pleniceps (Austin) Lindb. var. pleniceps | | Cephaloziaceae
|
| CEPLS | Cephalozia pleniceps (Austin) Lindb. var. sphagnorum (C. Massal.) J�rg. | | Cephaloziaceae
|
| CEPL3 | Cephalozia pleniceps (Austin) Lindb. | | Cephaloziaceae
|
| CEPHA5 | Cephalozia (Dumort. emend. Schiffn.) Dumort. | | Cephaloziaceae
|
| CEARA5 | Cephaloziella arctica Bryhn & Douin ssp. arctica | | Cephaloziellaceae
|
| CEAR15 | Cephaloziella arctica Bryhn & Douin | | Cephaloziellaceae
|
| CEAR14 | Cephaloziella arctogena (R. M. Schust.) Konst. | | Cephaloziellaceae
|
| CEAS4 | Cephaloziella aspericaulis J�rg. | | Cephaloziellaceae
|
| CEBI6 | Cephaloziella biloba (Lindenb.) M�ll. Frib. | | Cephaloziellaceae
|
| CEBR9 | Cephaloziella brinkmani Douin | | Cephaloziellaceae
|