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Genus Odontoglossum
- large and important genus of tropical American mostly epiphytic orchids; some of the most widely grown species are often placed in other genera
Genus Oncidium
- large genus of showy epiphytic or lithophytic or terrestrial orchids of tropical and subtropical America
Genus Ophrys
- a hardy genus of terrestrial orchids of Europe and northern Africa and western Asia
Genus Paphiopedilum
- horticulturally important genus of mainly terrestrial orchids including many hybrids; southeastern Asia and Indonesia to Philippines and Solomon Islands; Paphiopedilum species sometimes included in genus Cypripedium
Genus Phaius
- genus of Asiatic ans Australian terrestrial orchids
Genus Phalaenopsis
- genus of ornamental epiphytic orchids of Asia and Australia
Genus Pholidota
- genus of mostly epiphytic orchids of Indonesia and the western Pacific
Genus Phragmipedium
- genus of tropical American orchid species often included in genus Cypripedium or Paphiopedilum and Selenipedium: lady slippers
Genus Platanthera
- herbaceous terrestrial orchids of temperate northern and southern hemispheres
Genus Plectorrhiza
- small genus of Australian orchids