Lophiaris × oerstelurida
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Trichocentrum × oersteluridum
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Platanthera × okubo-hachijoensis
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Anacamptis × olida
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Anacamptis × olida subsp. darcissii
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Platanthera × ophryo-tipuloides
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Anacamptis × orientecaucasica
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Epidendrum × ormindoi
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Catasetum × ornaghiae
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Odontoglossum × ortgiesianum
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Encyclia × ortizii
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Blephariglottis × osceola
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Encyclia × osmentii
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Oncidium × osmentii
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Tolumnia × osmentii
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Cephalanthera × otto-hechtii
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Laelia × oweniae
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Odontoglossum × owenianum
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Cattleya × pachecoi
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Encyclia × padreortizii
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Lycaste × panchita
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Pleurothallis × parentis-certa
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Myrmecophila × parkinsoniana
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Schomburgkia × parkinsoniana