Oncidium Sw.
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
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Oncidium Aramis
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Oncidium Aranifera-Gattonense
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Oncidium Ararat
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Oncidium Arcansas
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Oncidium Archirondel
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Oncidium Archirondel (1998)
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Oncidium Architect
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Oncidium Arco Iris
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Oncidium Arctic Gold
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Oncidium Arcturus
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Oncidium Ardee
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Oncidium Ardenbrewii
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Oncidium Ardennes
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Oncidium Ardens
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Oncidium Ardent
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Oncidium Ardent Lover
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Oncidium Ardentdora
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Oncidium Ardentello
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Oncidium Ardenticity