Oncidium Sw.
Oncidium Cosmos
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Oncidium Costa
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Oncidium Costa Rica
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Oncidium Costa Rican Snow
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Oncidium cosymbephorum
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Oncidium Cota
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Oncidium Cotangi
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Oncidium Cotil au Geon
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Oncidium Cotil de Langlois
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Oncidium Cotil de Tesson
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Oncidium Cotil des Fontenelles
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Oncidium Cotil Echange
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Oncidium Cotillon
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Oncidium Cotton Candy
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Oncidium Coucy
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Oncidium Countess
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Oncidium Countessa
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Oncidium Country Inn
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Oncidium Coupe Pesky
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Oncidium Coupe Point
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Oncidium Couronne d’Or (1931)
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Oncidium Court William
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Oncidium Courteline
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Oncidium Covered Bridge