Oncidium × colnagoi
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Phragmipedium × colombianum
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Cypripedium × columbianum
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Platanthera × colwelliae
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Odontoglossum × concinnum
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Chysis × confusa
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Pleione × confusa
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Vanda × confusa
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Odontoglossum × cookeanum
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Odontoglossum × cookianum
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Gongora × copanensis
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Odontoglossum × coradinei
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Calanthe × cordilabium
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Encyclia × cordistes
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Platanthera × correllii
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Cattleya × crashleyi
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Cattleya × crethus
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Paphiopedilum × cribbii
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Lophiaris × crispilurida
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Trichocentrum × crispilurida
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Odontoglossum × cristatellum
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Cattleya × cristinae
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Hoffmannseggella × cristinae
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Oncidium × cubense