Oncidium Sw.
Oncidium Troyte
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Oncidium trulliferum
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Oncidium Tsiku Marguerite
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Oncidium Tsurugaoka Gem
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Oncidium Tsutiyama
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Oncidium Tubador
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Oncidium Tubama
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Oncidium Tuban
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Oncidium Tubandum
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Oncidium Tubare
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Oncidium Tubasta
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Oncidium Tuberon
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Oncidium Tudos
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Oncidium Tullamarine
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Oncidium Tunbridgensis
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Oncidium Tuolumne Meadows
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Oncidium Turalita
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Oncidium Tusonia
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Oncidium Tweed
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Oncidium Tweedledum
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Oncidium Twice Two
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Oncidium Twickenham
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Oncidium Twilight
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Oncidium Twilight (2010)