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Cadamba Sonn. = Guettarda L.
Cafe Adans. = Coffea L.
Calanda K.Schum. = Pentanisia Harv.
Calderonia Standl. = Simira Aubl.
Callicocca Schreb. = Psychotria L.
Callipeltis Steven
Calochone Keay
Calycodendron A.C.Sm. = Psychotria L.
Calycophyllum DC.
Calycosia A.Gray
Calycosiphonia Pierre ex Robbr.
Campanocalyx Valeton = Keenania Hook.f.
Camptophytum Pierre ex A.Chev. = Tarenna Gaertn.
Camptopus Hook.f. = Psychotria L.
Campylobotrys Lem. = Hoffmannia Sw.
Canephora Juss.
Canthiopsis Seem. = Tarenna Gaertn.
Canthium Lam.
Canthopsis Miq. = Catunaregam Wolf
Capirona Spruce
Caprosma G.Don = Coprosma J.R.Forst. & G.Forst.
Captaincookia N.Hallé = Ixora L.
Caquepiria J.F.Gmel. = Gardenia J.Ellis
Carapichea Aubl.
Carinta W.Wight = Geophila D.Don
Carmenocania Wernham = Pogonopus Klotzsch
Carpacoce Sond.
Carphalea Juss.
Carterella Terrell
Caruelina Kuntze = Chomelia Jacq.
Caryococca Willd. ex Roem. & Schult. = Gonzalagunia Ruiz & Pav.
Casasia A.Rich
Cascarilla (Endl.) Wedd. = Ladenbergia Klotzsch
Cassupa Humb. & Bonpl. = Isertia Schreb.
Catesbaea L.
Catunaregam Wolf
Cephaelis Sw. = Psychotria L.
Cephalanthus L.
Cephalidium A.Rich. = Breonia A.Rich ex DC.
Cephalina Thonn. = Sarcocephalus Afzel. ex R.Br.
Cephalodendron Steyerm. = Remijia DC.
Ceratites Sol. ex Miers = Rudgea Salisb.
Ceratopyxis Hook.f.
Ceriscoides (Hook.f.) Tirveng.
Ceriscus Gaertn. = Catunaregam Wolf
Ceuthocarpus Aiello
Chaenocarpus Neck. ex A.Juss. = Spermacoce L.
Chaetostachydium Airy Shaw
Chaetostachys Valeton = Chaetostachydium Airy Shaw
Chalazocarpus Hiern = Schumanniophyton Harms
Chalepophyllum Hook.f.
Chamaedaphne Mitch. = Mitchella L.
Chamaepentas Bremek.
Chamisme Nieuwl. = Houstonia L.
Chapelieria A.Rich ex DC.
Charpentiera Vieill. = Ixora L.
Chassalia Comm. ex Poir.
Chazaliella E.M.A.Petit & Verdc.
Chenocarpus Neck. = Spermacoce L.
Chesnea Scop = Psychotria L.
Chicoinaea Comm. ex DC. = Psathura Comm. ex A.Juss.
Chimarrhis Jacq.
Chiococca P.Browne
Chione DC.
Chlorochorion Puff & Robbr. = Pentanisia Harv.
Chlorostemma Ridl. = Galium L.
Chomelia Jacq.
Chomelia L. = Tarenna Gaertn.
Chondrococcus Steyerm. = Coccochondra Rauschert
Choristes Benth. = Deppea Schltdl. & Cham.
Choulettia Pomel = Plocama Aiton
Chrozorrhiza Ehrh. = Asperula L.
Chrysoxylon Wedd. = Pogonopus Klotzsch
Chytropsia Bremek. = Margaritopsis Sauvalle
Cigarrilla Aiello = Nernstia Urb.
Ciliosemina Antonelli
Cinchona L.
Cinchonopsis L.Andersson
Cladoceras Bremek.
Clarkella Hook.f.
Clavenna Neck. ex Standl. = Lucya DC.
Cleisocratera Korth. = Saprosma Blume
Clusiophyllea Baill. = Canthium Lam.
Coccochondra Rauschert
Coccocypselum P.Browne
Cococipsilum J.St.-Hill. = Coccocypselum P.Browne
Codaria Kuntze = Lerchea L.
Coddingtonia S.Bowdich = Psychotria L.
Coddia Verdc.
Codonocalyx Miers ex Lindl. = Psychotria L.
Coelopyrena Valeton
Coelospermum Blume
Cofeanthus A.Chev. = Coffea L.
Coffea L.
Coleactina N.Hallé
Colladonia Spreng. = Palicourea Aubl.
Colleteria David W.Taylor
Colletoecema E.M.A.Petit
Commianthus Benth. = Retiniphyllum Humb. & Bonpl.
Commitheca Bremek. = Pauridiantha Hook.f.
Condalia Ruiz & Pav. = Coccocypselum P.Browne
Condaminea DC.
Congdonia Jebs. = Declieuxia Kunth
Conosiphon Poepp. = Sphinctanthus Benth.
Conostomium (Stapf) Cufod.
Conotrichia A.Rich = Manettia Mutis ex L.
Coprosma J.R.Forst. & G.Forst.
Coptophyllum Korth.
Coptosapelta Korth.
Coptosperma Hook.f.
Cordia DC. = Guettarda L.
Cordiera A.Rich. ex DC.
Cordylostigma Groeninckx & Dessein
Cormigonus Raf. = Bikkia Reinw. ex Blume
Corynanthe Welw.
Corynula Hook.f. = Leptostigma Arn.
Coryphothamnus Steyerm.
Cosmibuena Ruiz & Pav.
Cosmocalyx Standl.
Coupoui Aubl. = Duroia L.f.
Coursiana Homolle = Payera Baill.
Coussarea Aubl.
Coutaportla Urb.
Coutarea Aubl.
Covolia Nick. = Spermacoce L.
Cowiea Wernham
Craterispermum Benth.
Creaghia Scort. = Mussaendopsis Baill.
Creatantha Standl. = Isertia Schreb.
Cremaspora Benth.
Cremocarpon Boivin ex Baill.
Crinita Houtt. = Pavetta L.
Crobylanthe Bremek.
Crocyllis E.Mey. ex Hook.f. = Plocama Aiton
Crossopteryx Fenzl
Crucianella L.
Cruciata Mill.
Cruckshanksia Hook. & Arn.
Crusea A.Rich. = Chione DC.
Crusea Schltdl. & Cham.
Cryptospermum Young = Opercularia Gaertn.
Csapodya Borhidi
Cuatrecasasiodendron Steyerm. = Arachnothryx Planch.
Cubanola Aiello
Cucullaria Kuntze = Callipeltis Steven
Cuncea Buch.-Ham. ex D.Don = Knoxia L.
Cunina Clos = Nertera Banks ex Sol.
Cunninghamia Schreb. = Malanea Aubl.
Cupi Adans. = Tarenna Gaertn.
Cupia (Schult.) DC. = Aidia Lour.
Cupirana Miers = Duroia L.f.
Cupuia Raf. = Duroia L.f.
Cutaria Brign. = Coutarea Aubl.
Cuviera DC.
Cyanoneuron Tange
Cyclophyllum Hook.f.
Cymelonema C.Presl = Urophyllum Jack ex Wall.
Cynanchica Fourr. = Asperula L.
Cynocrambe Gagnebin = Theligonum L.
Cyrtanthus Schreb. = Posoqueria Aubl.