- C.A.Armstr.
- C.A.Gardner
- C.A.Mey.
- C.Abel
- C.Agardh
- C.B.Clarke
- C.Bab.
- C.Bauhin
- C.Bayer
- C.Bicknell
- C.C.Chang
- C.C.Cowan
- C.C.Gmel.
- C.Chr.
- C.D.Adams
- C.D.Bouché
- C.DC.
- C.Díaz
- C.E.Blanco
- C.E.C.Fisch.
- C.E.Cramer
- C.E.Hubb.
- C.E.Lundstr.
- C.Ehrenb.
- C.F.Gaertn.
- C.F.Liang
- C.F.Reed
- C.F.Wolff
- C.Fraser
- C.G.Chen
- C.H.Chow
- C.H.Perss.
- C.H.Wright
- C.J.Chen
- C.J.Saldanha
- C.Jeffrey
- C.Juss.
- C.K.Schneid.
- C.L.Boynton
- C.L.Hitchc.
- C.Lawson
- C.Koch
- C.Marquand
- C.Mohr
- C.Moore
- C.Morren
- C.Müll.
- C.N.Page
- C.P.Cowan
- C.Presl
- C.Rivière
- C.S.Kumar
- C.Schweinf.
- C.Shih
- C.Siebold
- C.Sm.
- C.T.White
- C.Thiébaut
- C.Tul.
- C.V.Morton
- C.Vicioso
- C.W.Chang
- C.W.Dufft
- C.Winkl.
- C.Wright
- C.X.Li
- C.Y.Wu
- C.Y.Yang
- C.Yen
- Cabrera
- Caldesi
- Caley
- Camarrone
- Cambess.
- Campacci
- Campb.
- Cantor
- Capuron
- Cardot
- Carrière
- Caruel
- Carver
- Casp.
- Cass.
- Castaño
- Cav.
- Cavestro
- Celak.
- Cerv.
- Ces.
- Cesalpino
- Chabert
- Chaix
- Chalk
- Cham.
- Chapm.
- Chase
- Chatin
- Chatterjee
- Chaub.
- Chaytor
- Cheel
- Cheeseman
- Cheesman
- Chennav.
- Chevall.
- Ching
- Chiov.
- Chiron
- Chitr.
- Chithra
- Choisy
- Cholodnyj
- Christ
- Christenson
- Christm.
- Chrtek
- Chun
- Cienk.
- Cinovskis
- Cirillo
- Clarke
- Claus
- Claverie
- Cleland
- Clem.
- Clifford
- Clus.
- Cockayne
- Cockerell
- Coem.
- Cogn.
- Cohn
- Coker
- Colebr.
- Coll
- Colla
- Colenso
- Collett
- Collinson
- Coltm.-Rog.
- Comes
- Comm.
- Compton
- Conran
- Conrath
- Cooke
- Copel.
- Corda
- Cordem.
- Corley
- Corner
- Cornu
- Corrêa
- Correns
- Cortesi
- Coss.
- Coult.
- Courtois
- Covas
- Coville
- Cowan
- Craib
- Cranfill
- Crantz
- Crép.
- Cretz.
- Crisci
- Crisp
- Croat
- Croizat
- Cronquist
- Crueg.
- Csató
- Cuatrec.
- Cubitt
- Cuello
- Cufod.
- Curtis
- Custer
- Cutak
- Czern.
- Czerniak.