Cattleya Oshawa
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Cattleya Osirex
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Cattleya Osiris
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Cattleya Osiris (1947)
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Encyclia osmantha
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Epidendrum osmanthum
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Cattleya Osprey
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Cattleya Osric
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Cattleya Ossa
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Cattleya Ossian (1914)
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Cattleya Ossian (1948)
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Cattleya Ostende
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Cattleya Osterberg
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Laelia ostermayerii
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Cattleya Osterpurpur
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Cattleya Ostia
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Cattleya OSWA 75th Jubilee
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Cattleya Oswaldo Cruz
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Cattleya Osyana
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Cattleya Otay
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Cattleya Othello
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Cattleya Otis and Erma Watts
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Cattleya Otley
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Cattleya Otranto