Epidendrum oerstedii
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Cattleya Oetji Soekandar
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Cattleya Oglethorpe
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Cattleya Oh Boy
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Cattleya Oh Hock Neo
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Cattleya Oh My
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Cattleya Oh Sam
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Cattleya Oh See
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Cattleya Ohbaku
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Cattleya Ohbatake
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Cattleya Okami
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Cattleya Okana
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Cattleya Okarchee
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Cattleya Okay
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Cattleya Okayama Charm
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Epidendrum Okayama Peacock
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Cattleya Okayasu Hisae
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Cattleya Okeanos
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Cattleya Oki Moriyama
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Cattleya Okinawa
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Cattleya Olaf (1908)
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Cattleya Olaf (1918)
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Cattleya Olaf Harold
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Cattleya Old Forester