Oncidium Sw.
Oncidium Portent Fair
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Oncidium Portentosa
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Oncidium Portheron
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Oncidium Porthos
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Oncidium Portia (1916)
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Oncidium Portia (1919)
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Oncidium portillae
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Oncidium Portinfer
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Oncidium Portland
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Oncidium portmannii
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Oncidium Pot du Rocher
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Oncidium povedanum
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Oncidium powellii
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Oncidium Powotis
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Oncidium Pradier
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Oncidium praenitens
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Oncidium praestanoides
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Oncidium Praestans
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Oncidium praetextum
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Oncidium Precocious
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Oncidium Pres des Lumiers
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Oncidium President Harding (AandB)
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Oncidium President Harding (S)
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Oncidium President Hoover