Oncidium Sw.
Oncidium Aphrodite (1917-1)
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Oncidium Aphrodite (1917-2)
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Oncidium Aphrodora
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Oncidium apiculatum
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Oncidium Apiola
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Oncidium Apoda
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Oncidium Apollo
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Oncidium Apollo Bay
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Oncidium Apollo Eight
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Oncidium Appellicon
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Oncidium Apperley Bridge
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Oncidium Applause
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Oncidium Apple Dream
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Oncidium Apricot Meadows
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Oncidium April
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Oncidium Apulia
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Oncidium Aquila
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Oncidium Aquitania
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Oncidium Aquitoris
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Oncidium Arab
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Oncidium Arab Chief
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Oncidium Arabic
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Oncidium Arachne
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Oncidium Aragon