| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| CEMY2 | Cenchropsis myosuroides (Kunth) Nash | Cenchrus myosuroides | Poaceae
|
| CEAGA | Cenchrus agrimonioides Trin. var. agrimonioides | kamanomano | Poaceae
|
| CEAGL | Cenchrus agrimonioides Trin. var. laysanensis F. Br. | kamanomano | Poaceae
|
| CEAG | Cenchrus agrimonioides Trin. | kamanomano | Poaceae
|
| CEBA2 | Cenchrus barbatus Schumacher | Cenchrus biflorus | Poaceae
|
| CEBI | Cenchrus biflorus Roxb. | Indian sandburr | Poaceae
|
| CEBR | Cenchrus brownii Roemer & J.A. Schultes | slimbristle sandbur | Poaceae
|
| CECA6 | Cenchrus carolinianus Walt. | Cenchrus longispinus | Poaceae
|
| CECA13 | Cenchrus catharticus Delile | Cenchrus biflorus | Poaceae
|
| CECI | Cenchrus ciliaris L. | Pennisetum ciliare var. ciliare | Poaceae
|
| CEECH | Cenchrus echinatus L. var. hillebrandianus (A.S. Hitchc.) F. Br. | Cenchrus echinatus | Poaceae
|
| CEEC | Cenchrus echinatus L. | southern sandbur | Poaceae
|
| CEGR3 | Cenchrus gracillimus Nash | slender sandbur | Poaceae
|
| CEGR10 | Cenchrus granularis L. | Hackelochloa granularis | Poaceae
|
| CEIN4 | Cenchrus incertus M.A. Curtis | Cenchrus spinifex | Poaceae
|
| CELO7 | Cenchrus longisetus M.C. Johnston | Pennisetum villosum | Poaceae
|
| CELO3 | Cenchrus longispinus (Hack.) Fern. | mat sandbur | Poaceae
|
| CEMY | Cenchrus myosuroides Kunth | big sandbur | Poaceae
|
| CENE | Cenchrus nervosus (Nees) Kuntze | Pennisetum nervosum | Poaceae
|
| CEPA11 | Cenchrus parviceps Shinners | Cenchrus spinifex | Poaceae
|
| CEPA12 | Cenchrus pauciflorus Benth. | Cenchrus spinifex | Poaceae
|
| CEPE3 | Cenchrus pedunculatus O. Deg. & Whitney | Cenchrus agrimonioides var. laysanensis | Poaceae
|
| CERA2 | Cenchrus racemosus L. | Tragus racemosus | Poaceae
|
| CESE2 | Cenchrus setigerus Vahl | Pennisetum ciliare var. setigerum | Poaceae
|
| CESP4 | Cenchrus spinifex Cav. | coastal sandbur | Poaceae
|
| CETR | Cenchrus tribuloides L. | sanddune sandbur | Poaceae
|
| CEVI7 | Cenchrus viridis Spreng. | Cenchrus brownii | Poaceae
|
| CENCH | Cenchrus L. | sandbur | Poaceae
|
| CEAM2 | Centaurea americana Nutt. | American star-thistle | Asteraceae
|
| CEAS2 | Centaurea aspera L. | rough star-thistle | Asteraceae
|
| CEAU3 | Centaurea austriaca Willd. | Centaurea phrygia | Asteraceae
|
| CEBE5 | Centaurea benedicta (L.) L. | Cnicus benedictus | Asteraceae
|
| CEBI2 | Centaurea biebersteinii DC. | spotted knapweed | Asteraceae
|
| CEBO | Centaurea bovina Velen. | pasture knapweed | Asteraceae
|
| CECA2 | Centaurea calcitrapa L. | red star-thistle | Asteraceae
|
| CECA5 | Centaurea calcitrapoides L. | smallhead star-thistle | Asteraceae
|
| CECI2 | Centaurea cineraria L. | dusty miller | Asteraceae
|
| CECY2 | Centaurea cyanus L. | garden cornflower | Asteraceae
|
| CEDE15 | Centaurea dealbata Willd. | whitewash cornflower | Asteraceae
|
| CEDET | Centaurea debeauxii Gren. & Godr. ssp. thuillieri Dost�l | meadow knapweed | Asteraceae
|
| CEDE5 | Centaurea debeauxii Gren. & Godr. | meadow knapweed | Asteraceae
|
| CEDE10 | Centaurea depressa Bieb. | | Asteraceae
|
| CEDI3 | Centaurea diffusa Lam. | white knapweed | Asteraceae
|
| CEDI4 | Centaurea diluta Ait. | North African knapweed | Asteraceae
|
| CEDUV | Centaurea dubia Suter ssp. vochinensis (Bernh. ex Reichenb.) Hayek | Centaurea nigrescens | Asteraceae
|
| CEDU3 | Centaurea dubia Suter | Centaurea transalpina | Asteraceae
|
| CEER | Centaurea eriophora L. | wild sandheath | Asteraceae
|
| CEIB | Centaurea iberica Trev. ex Spreng. | Iberian knapweed | Asteraceae
|
| CEJA | Centaurea jacea L. | brownray knapweed | Asteraceae
|
| CEMA9 | Centaurea macrocephala Puschk. ex Willd. | bighead knapweed | Asteraceae
|
| CEMA4 | Centaurea maculosa auct. non Lam. | Centaurea biebersteinii | Asteraceae
|
| CEME2 | Centaurea melitensis L. | Maltese star-thistle | Asteraceae
|
| CEMO6 | Centaurea �moncktonii C. E. Britton | meadow knapweed | Asteraceae
|
| CEMO | Centaurea montana L. | perennial cornflower | Asteraceae
|
| CEMO3 | Centaurea moschata L. | Amberboa moschata | Asteraceae
|
| CEMU | Centaurea muricata L. | Cyanopsis muricata | Asteraceae
|
| CENE2 | Centaurea nervosa Willd. | Centaurea uniflora ssp. nervosa | Asteraceae
|
| CENIR | Centaurea nigra L. var. radiata DC. | Centaurea nigra | Asteraceae
|
| CENI2 | Centaurea nigra L. | lesser knapweed | Asteraceae
|
| CENI3 | Centaurea nigrescens Willd. | Tyrol knapweed | Asteraceae
|
| CEPA14 | Centaurea paniculata L. | Jersey knapweed | Asteraceae
|
| CEPH | Centaurea phrygia L. | wig knapweed | Asteraceae
|
| CEPI3 | Centaurea picris Pallas ex Willd. | Acroptilon repens | Asteraceae
|
| CEPO8 | Centaurea �pouzinii DC. | | Asteraceae
|
| CEPR2 | Centaurea pratensis Thuill., non Salisb. | Centaurea debeauxii ssp. thuillieri | Asteraceae
|
| CERE6 | Centaurea repens L. | Acroptilon repens | Asteraceae
|
| CERO | Centaurea rothrockii Greenm. | Rothrock's knapweed | Asteraceae
|
| CESA5 | Centaurea salmantica L. | Mantisalca salmantica | Asteraceae
|
| CESC2 | Centaurea scabiosa L. | greater knapweed | Asteraceae
|
| CESO3 | Centaurea solstitialis L. | yellow star-thistle | Asteraceae
|
| CESQ | Centaurea squarrosa Willd. | Centaurea triumfettii | Asteraceae
|
| CESU | Centaurea sulphurea Willd. | sulphur knapweed | Asteraceae
|
| CETR6 | Centaurea transalpina Schleich. ex DC. | alpine knapweed | Asteraceae
|
| CETR12 | Centaurea trichocephala Bieb. ex Willd. | feather-head knapweed | Asteraceae
|
| CETR8 | Centaurea triumfettii All. | squarrose knapweed | Asteraceae
|
| CEUNN | Centaurea uniflora Turra ssp. nervosa (Willd.) Bonnier & Layens | singleflower knapweed | Asteraceae
|
| CEUN2 | Centaurea uniflora Turra | singleflower knapweed | Asteraceae
|
| CEVIS | Centaurea virgata Lam. var. squarrosa (Willd.) Boiss. | Centaurea triumfettii | Asteraceae
|
| CEVI | Centaurea virgata Lam. | Centaurea triumfettii | Asteraceae
|
| CEVO2 | Centaurea vochinensis Bernh. ex Reichenb. | Centaurea nigrescens | Asteraceae
|
| CENTA | Centaurea L. | knapweed | Asteraceae
|
| CEPA13 | Centaurella paniculata Michx. | Bartonia paniculata ssp. paniculata | Gentianaceae
|
| CEVE6 | Centaurella verna Michx. | Bartonia verna | Gentianaceae
|
| CEAR12 | Centaurium arizonicum (Gray) Heller | Arizona centaury | Gentianaceae
|
| CEBEG | Centaurium beyrichii (Torr. & Gray ex Torr.) B.L. Robins. var. glanduliferum Correll | Centaurium glanduliferum | Gentianaceae
|
| CEBE | Centaurium beyrichii (Torr. & Gray ex Torr.) B.L. Robins. | quinineweed | Gentianaceae
|
| CEBR8 | Centaurium breviflorum (Shinners) B.L. Turner | shortflower centaury | Gentianaceae
|
| CEBR4 | Centaurium brittonii Millsp. & Greenm. | Centaurium quitense | Gentianaceae
|
| CECAA | Centaurium calycosum (Buckl.) Fern. var. arizonicum (Gray) Tidestrom | Centaurium arizonicum | Gentianaceae
|
| CECAB | Centaurium calycosum (Buckl.) Fern. var. breviflorum Shinners | Centaurium breviflorum | Gentianaceae
|
| CECAN | Centaurium calycosum (Buckl.) Fern. var. nanum (Gray) B.L. Robins. | Centaurium calycosum | Gentianaceae
|
| CECA3 | Centaurium calycosum (Buckl.) Fern. | Arizona centaury | Gentianaceae
|
| CECU3 | Centaurium curvistamineum (Wittr.) Abrams | Centaurium muehlenbergii | Gentianaceae
|
| CEDA | Centaurium davyi (Jepson) Abrams | Davy's centaury | Gentianaceae
|
| CEER5 | Centaurium erythraea Rafn | European centaury | Gentianaceae
|
| CEEX | Centaurium exaltatum (Griseb.) W. Wight ex Piper | desert centaury | Gentianaceae
|
| CEFL | Centaurium floribundum (Benth.) B.L. Robins. | Centaurium muehlenbergii | Gentianaceae
|
| CEGL6 | Centaurium glanduliferum (Correll) B.L. Turner | sticky centaury | Gentianaceae
|
| CEMA19 | Centaurium maryannum B.L. Turner | gypsum centaury | Gentianaceae
|
| CEMI8 | Centaurium minus auct. non Moench | Centaurium erythraea | Gentianaceae
|
| CEMU2 | Centaurium muehlenbergii (Griseb.) W. Wight ex Piper | Muhlenberg's centaury | Gentianaceae
|