Calanthidium, Genus – synonym of Calanthe, Genus
Calcarifera, Section (Dendrobium)
Calcearia, Genus – synonym of Corybas, Genus
Callostylis, Genus – synonym of Eria, Genus
Camarotis, Genus – synonym of Micropera, Genus
Camelostalix, Genus – synonym of Pholidota, Genus
Campanulorchis, Genus – synonym of Eria, Genus
Canacorchis, Genus – synonym of Bulbophyllum, Genus
Canacorchis, Genus – synonym of Monanthes, Section (Bulbophyllum)
Carparomorchis, Genus – synonym of Bulbophyllum, Genus
Carteretia, Genus – synonym of Cleisostoma, Genus
Caulescentes, Section (Plocoglottis)
Caulophreatia, Section (Phreatia)
Centrochilus, Genus – synonym of Habenaria, Genus
Centrosis, Genus – synonym of Calanthe, Genus
Ceratium, Genus – synonym of Eria, Genus
Ceratopsis, Genus – synonym of Epipogium, Genus
Ceratostylis, Section (Ceratostylis)
Ceratostylis/Juncorchis, Section (Ceratostylis)
Ceratostylopsis, Section – synonym of Stachysanthes, Section (Bulbophyllum)
Cerochilus, Genus – synonym of Hetaeria, Genus
Cestichis, Section (Malaxideae)
Cestichis, Genus – synonym of Liparis, Genus
Chaunodesme, Section (Appendicula)
Chaunodesme/Fissanthera, Section (Appendicula)
Chaunodesme?, Section (Appendicula)
Cheiropterocephalus, Genus – synonym of Malaxis, Genus
Chelonanthera, Section (Pholidota)
Chelonanthera, Genus – synonym of Pholidota, Genus
Chilopogon, Section (Appendicula)
Chilopogon, Genus – synonym of Appendicula, Genus
Chitonanthera, Genus – synonym of Octarrhena, Genus
Chitonochilus, Genus – synonym of Agrostophyllum, Genus
Chlorinae, Section (Habenaria)
Chlorosa, Genus – synonym of Cryptostylis, Genus
Choeradoplectron, Genus – synonym of Peristylus, Genus
Chrysobaphus, Genus – synonym of Anoectochilus, Genus
Cionisaccus, Genus – synonym of Goodyera, Genus
Cirrhopetaloides, Section – synonym of Cirrhopetalum, Section (Bulbophyllum)
Cirrhopetalum, Section (Bulbophyllum)
Cirrhopetalum, Genus – synonym of Bulbophyllum, Genus
Cirrhopetalum, Genus – synonym of Cirrhopetalum, Section (Bulbophyllum)
Cirrhopetalum, Subgenus – synonym of Cirrhopetalum, Section (Bulbophyllum)
Cistella, Genus – synonym of Geodorum, Genus
Cnemidia, Genus – synonym of Tropidia, Genus
Cochlia, Genus – synonym of Brachystachyae, Section (Bulbophyllum)
Cochlia, Genus – synonym of Bulbophyllum, Genus
Cochlia, Section – synonym of Brachystachyae, Section (Bulbophyllum)
Codonosiphon, Section (Bulbophyllum)
Codonosiphon, Genus – synonym of Bulbophyllum, Genus
Codonosiphon, Genus – synonym of Codonosiphon, Section (Bulbophyllum)
Coelochilus, Section – synonym of Codonosiphon, Section (Bulbophyllum)
Coeloglossum, Genus – synonym of Peristylus, Genus
Collabiopsis, Genus – synonym of Collabium, Genus
Conchidium, Genus – synonym of Eria, Genus
Conchochilus, Genus – synonym of Appendicula, Genus
Conchoglossum, Genus – synonym of Cyrtosia, Genus
Conopsidium, Genus – synonym of Platanthera, Genus
Conostalix, Section (Dendrobium)
Coralliokyphos, Genus – synonym of Moerenhoutia, Genus
Cordula, Genus – synonym of Paphiopedilum, Genus
Cordyla, Genus – synonym of Nervilia, Genus
Cordylestylis, Genus – synonym of Goodyera, Genus
Corymbis, Genus – synonym of Corymborkis, Genus
Corymborchis, Genus – synonym of Corymborkis, Genus
Coryopedilum, Section (Paphiopedilum)
Corysanthes, Genus – synonym of Corybas, Genus
Crangonorchis, Genus – synonym of Pterostylis, Genus
Crepidium, Section (Malaxideae)
Crepidium, Genus – synonym of Malaxis, Genus
Crinonia, Genus – synonym of Pholidota, Genus
Crumenata, Section (Dendrobium)
Cryptoglottis, Genus – synonym of Podochilus, Genus
Cryptorchis, Genus – synonym of Taeniophyllum, Genus
Cyanorkis, Genus – synonym of Phaius, Genus
Cybele, Genus – synonym of Herminium, Genus
Cycloglossum, Section – synonym of Peltopus, Section (Bulbophyllum)
Cylindracea, Section – synonym of Brachystachyae, Section (Bulbophyllum)
Cylindrochilus, Genus – synonym of Thrixspermum, Genus
Cylindrolobus, Genus – synonym of Eria, Genus
Cylindrolobus?, Section (Eria)
Cymboglossum, Genus – synonym of Eria, Genus
Cyperorchis, Genus – synonym of Cymbidium, Genus
Cyphochilus, Section (Appendicula)
Cyphochilus, Genus – synonym of Appendicula, Genus
Cyrtopera, Genus – synonym of Eulophia, Genus
Cystopus, Genus – synonym of Pristiglottis, Genus