Oncidium Sw.
Oncidium Cheryl Anne
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Oncidium Cheryl Blackburn
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Oncidium Chessingtonensis
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Oncidium Chesswood
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Oncidium Chestan
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Oncidium Chestertonii
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Oncidium Chestnut Mountain
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Oncidium Chevening
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Oncidium Chewelah
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Oncidium Chian-Tzy Chiou-Ping
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Oncidium Chian-Tzy Louiscum
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Oncidium Chichen Itza
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Oncidium Chichester
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Oncidium Chichester Finale
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Oncidium Chiddingfold
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Oncidium Chieftain
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Oncidium Chieri Debut
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Oncidium Chiffon
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Oncidium Chignik Harbor
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Oncidium Chilgrove
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Oncidium Chilliwack
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Oncidium Chimaltenango
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Oncidium Chimene
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Oncidium China Red