Oncidium Sw.
Oncidium Ardenworth
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Oncidium Arethusa
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Oncidium Argia
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Oncidium Argicleer
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Oncidium Argos
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Oncidium Argus
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Oncidium Ariadne
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Oncidium Ariadne (1919)
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Oncidium ariasii
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Oncidium Aricia
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Oncidium Aricia (1928)
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Oncidium Ariel
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Oncidium Ariel (1918)
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Oncidium Ariitea
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Oncidium Arion
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Oncidium Aristocrat (1934)
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Oncidium Aristocrat (1940)
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Oncidium aristuliferum
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Oncidium arizajulianum
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Oncidium Arizona (1929)
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Oncidium Arlequin
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Oncidium Arlington
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Oncidium Arlotta
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Oncidium Arm-Roy’s Dancer