| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| CESA | Ceanothus sanguineus Pursh | redstem ceanothus | Rhamnaceae
|
| CESE5 | Ceanothus serpyllifolius Nutt. | coastal plain buckbrush | Rhamnaceae
|
| CESE | Ceanothus �serrulatus McMinn (pro sp.) | Cascade Lake ceanothus | Rhamnaceae
|
| CESO | Ceanothus sonomensis J.T. Howell | Sonoma ceanothus | Rhamnaceae
|
| CESO2 | Ceanothus sorediatus Hook. & Arn. | jimbrush | Rhamnaceae
|
| CESPP | Ceanothus spinosus Nutt. var. palmeri (Trel.) Jepson | Ceanothus palmeri | Rhamnaceae
|
| CESP | Ceanothus spinosus Nutt. | redheart | Rhamnaceae
|
| CESU3 | Ceanothus subsericeus Rydb. | Ceanothus fendleri | Rhamnaceae
|
| CETHR | Ceanothus thyrsiflorus Eschsch. var. repens McMinn | Ceanothus thyrsiflorus | Rhamnaceae
|
| CETH | Ceanothus thyrsiflorus Eschsch. | blueblossom | Rhamnaceae
|
| CETOO2 | Ceanothus tomentosus Parry ssp. olivaceus (Jepson) Munz | Ceanothus tomentosus | Rhamnaceae
|
| CETOO | Ceanothus tomentosus Parry var. olivaceus Jepson | Ceanothus tomentosus | Rhamnaceae
|
| CETO | Ceanothus tomentosus Parry | woolyleaf ceanothus | Rhamnaceae
|
| CEVA | Ceanothus �vanrensselaeri J.B. Roof | | Rhamnaceae
|
| CEVE4 | Ceanothus �veitchianus Hook. (pro sp.) | | Rhamnaceae
|
| CEVEH2 | Ceanothus velutinus Dougl. ex Hook. var. hookeri M.C. Johnston | Hooker's ceanothus | Rhamnaceae
|
| CEVEL | Ceanothus velutinus Dougl. ex Hook. var. laevigatus Torr. & Gray | Ceanothus velutinus var. hookeri | Rhamnaceae
|
| CEVEL2 | Ceanothus velutinus Dougl. ex Hook. var. lorenzenii Jepson | Ceanothus lorenzenii | Rhamnaceae
|
| CEVEV4 | Ceanothus velutinus Dougl. ex Hook. var. velutinus | snowbrush ceanothus | Rhamnaceae
|
| CEVE | Ceanothus velutinus Dougl. ex Hook. | snowbrush ceanothus | Rhamnaceae
|
| CEVE2 | Ceanothus verrucosus Nutt. | barranca brush | Rhamnaceae
|
| CEVE9 | Ceanothus vestitus Greene | Ceanothus greggii var. vestitus | Rhamnaceae
|
| CEANO | Ceanothus L. | ceanothus | Rhamnaceae
|
| CEUM3 | Cecidonia umbonella (Nyl.) Triebel & Rambold | | Lecideaceae
|
| CECID | Cecidonia Treibel & Rambold | cecidonia | Lecideaceae
|
| CEAD2 | Cecropia adenopus Mart. ex Miq. | Ambay pumpwood | Cecropiaceae
|
| CEOB | Cecropia obtusifolia Bertol. | trumpet tree | Cecropiaceae
|
| CEPE | Cecropia peltata auct. non L. | Cecropia schreberiana | Cecropiaceae
|
| CESC9 | Cecropia schreberiana Miq. | pumpwood | Cecropiaceae
|
| CECRO | Cecropia Loefl. | pumpwood | Cecropiaceae
|
| CEOD | Cedrela odorata L. | Spanish cedar | Meliaceae
|
| CETOA | Cedrela toona Roxb. ex Rottl. & Willd. var. australis (F. Muell.) C. DC. | Toona ciliata ssp. ciliata var. australis | Meliaceae
|
| CEDRE | Cedrela P. Br. | cedrela | Meliaceae
|
| CECA | Cedronella canariensis (L.) Willd. ex Webb & Berth. | herb of Gilead | Lamiaceae
|
| CEMI7 | Cedronella micrantha Gray | Agastache micrantha | Lamiaceae
|
| CEDRO | Cedronella Moench | cedronella | Lamiaceae
|
| CEDE2 | Cedrus deodara (Roxb. ex D. Don) G. Don f. | Deodar cedar | Pinaceae
|
| CEDRU | Cedrus Trew | cedar | Pinaceae
|
| CEAC4 | Ceiba acuminata (S. Watson) Rose | pochote | Bombacaceae
|
| CEAE2 | Ceiba aesculifolia (Kunth) Britten & Baker | pochote | Bombacaceae
|
| CEPE2 | Ceiba pentandra (L.) Gaertn. | kapoktree | Bombacaceae
|
| CESP7 | Ceiba speciosa (A. St.-Hil.) Ravenna | floss-silktree | Bombacaceae
|
| CEIBA | Ceiba P. Mill. | ceiba | Bombacaceae
|
| CEAL7 | Celastrus alatus Thunb. | Euonymus alata | Celastraceae
|
| CEED | Celastrus edulis Vahl | Catha edulis | Celastraceae
|
| CEOR | Celastrus orbiculata Thunb. | Asian bittersweet | Celastraceae
|
| CEOR7 | Celastrus orbiculatus Thunb. | oriental bittersweet | Celastraceae
|
| CESC | Celastrus scandens L. | American bittersweet | Celastraceae
|
| CELAS | Celastrus L. | bittersweet | Celastraceae
|
| CEGR11 | Celeri graveolens (L.) Britt. p.p. | Apium graveolens var. dulce | Apiaceae
|
| CEVA2 | Celidium varians Arnold | Arthonia glaucomaria | Arthoniaceae
|
| CESP8 | Celmisia spectabilis Hook. f. | | Asteraceae
|
| CELMI | Celmisia Cass. | celmisia | Asteraceae
|
| CEARC | Celosia argentea L. var. cristata (L.) Kuntze | Celosia cristata | Amaranthaceae
|
| CEAR3 | Celosia argentea L. | silver cock's comb | Amaranthaceae
|
| CECR2 | Celosia cristata L. | crested cock's comb | Amaranthaceae
|
| CEMA17 | Celosia margaritacea L. | Celosia argentea | Amaranthaceae
|
| CENI | Celosia nitida Vahl | West Indian cock's comb | Amaranthaceae
|
| CEPA5 | Celosia palmeri S. Wats. | Palmer's cock's comb | Amaranthaceae
|
| CEPA10 | Celosia paniculata L. 1763, non 1753 | Chamissoa altissima | Amaranthaceae
|
| CETR7 | Celosia trigyna L. | woolflower | Amaranthaceae
|
| CEVI4 | Celosia virgata Jacq. | albahaca | Amaranthaceae
|
| CELOS | Celosia L. | cock's comb | Amaranthaceae
|
| CEAC5 | Celothelium aciculiferum (Nyl.) Vainio | | Uncertain Lichen Family
|
| CELOT | Celothelium A. Massal. | celothelium | Uncertain Lichen Family
|
| CEAU8 | Celtis australis L. | | Ulmaceae
|
| CEBR7 | Celtis brevipes S. Wats. | Celtis laevigata var. brevipes | Ulmaceae
|
| CECA9 | Celtis canina Raf. | Celtis occidentalis var. canina | Ulmaceae
|
| CEDO | Celtis douglasii Planch. | Celtis laevigata var. reticulata | Ulmaceae
|
| CEGE2 | Celtis georgiana Small | Celtis tenuifolia | Ulmaceae
|
| CEIG | Celtis iguanaea (Jacq.) Sarg. | iguana hackberry | Ulmaceae
|
| CELAA | Celtis laevigata Willd. var. anomala Sarg. | Celtis laevigata var. laevigata | Ulmaceae
|
| CELAB2 | Celtis laevigata Willd. var. brachyphylla Sarg. | Celtis laevigata var. laevigata | Ulmaceae
|
| CELAB | Celtis laevigata Willd. var. brevipes (S. Wats.) Sarg. | sugarberry | Ulmaceae
|
| CELAL | Celtis laevigata Willd. var. laevigata | sugarberry | Ulmaceae
|
| CELAR | Celtis laevigata Willd. var. reticulata (Torr.) L. Benson | netleaf hackberry | Ulmaceae
|
| CELAS3 | Celtis laevigata Willd. var. smallii (Beadle) Sarg. | Celtis tenuifolia | Ulmaceae
|
| CELAT8 | Celtis laevigata Willd. var. texana Sarg. | Texan sugarberry | Ulmaceae
|
| CELA | Celtis laevigata Willd. | sugarberry | Ulmaceae
|
| CELI | Celtis lindheimeri Engelm. ex K. Koch | Lindheimer's hackberry | Ulmaceae
|
| CEMI9 | Celtis mississippiensis Bosc | Celtis tenuifolia | Ulmaceae
|
| CEOCC | Celtis occidentalis L. var. canina (Raf.) Sarg. | common hackberry | Ulmaceae
|
| CEOCC3 | Celtis occidentalis L. var. crassifolia (Lam.) Gray | Celtis occidentalis var. occidentalis | Ulmaceae
|
| CEOCG | Celtis occidentalis L. var. georgiana (Small) Ahles | Celtis tenuifolia | Ulmaceae
|
| CEOCO2 | Celtis occidentalis L. var. occidentalis | common hackberry | Ulmaceae
|
| CEOCP | Celtis occidentalis L. var. pumila (Pursh) Gray | common hackberry | Ulmaceae
|
| CEOCR | Celtis occidentalis L. var. reticulata (Torr.) Sarg. | Celtis laevigata var. reticulata | Ulmaceae
|
| CEOC | Celtis occidentalis L. | common hackberry | Ulmaceae
|
| CEPA8 | Celtis pallida Torr. | spiny hackberry | Ulmaceae
|
| CEPUD2 | Celtis pumila Pursh var. deamii Sarg. | Celtis occidentalis var. pumila | Ulmaceae
|
| CEPUG | Celtis pumila Pursh var. georgiana (Small) Sarg. | Celtis tenuifolia | Ulmaceae
|
| CEPU10 | Celtis pumila Pursh | Celtis occidentalis var. pumila | Ulmaceae
|
| CEREV | Celtis reticulata Torr. var. vestita Sarg. | Celtis laevigata var. reticulata | Ulmaceae
|
| CERE2 | Celtis reticulata Torr. | Celtis laevigata var. reticulata | Ulmaceae
|
| CESM | Celtis smallii Beadle | Celtis tenuifolia | Ulmaceae
|
| CESPP2 | Celtis spinosa Spreng. var. pallida (Torr.) M.C. Johnston | Celtis pallida | Ulmaceae
|
| CETAP | Celtis tala Gillies var. pallida (Torr.) Planch. | Celtis pallida | Ulmaceae
|
| CETEG | Celtis tenuifolia Nutt. var. georgiana (Small) Fern. & Schub. | Celtis tenuifolia | Ulmaceae
|
| CETES | Celtis tenuifolia Nutt. var. soperi Boivin | Celtis tenuifolia | Ulmaceae
|
| CETE | Celtis tenuifolia Nutt. | dwarf hackberry | Ulmaceae
|
| CETR3 | Celtis trinervia Lam. | almex | Ulmaceae
|