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Genus Scaphosepalum
- comprises some tropical American species usually placed in genus Masdevallia: diminutive plants with small flowers carried on one scape
Genus Schomburgkia
- genus of tropical American epiphytic orchids with showy racemose flowers
Genus Selenipedium
- genus of tall reedlike tropical American orchids; includes species with pods used locally as a substitute for vanilla
Genus Sobralia
- genus of tropical American orchids
Genus Spiranthes
- large cosmopolitan genus of white-flowered terrestrial orchids
Genus Stanhopea
- genus of tropical American epiphytic orchids
Genus Stelis
- genus of small caespitose orchids of tropical America
Genus Trichoceros
- small genus of small epiphytic or terrestrial orchids of tropical South America
Genus Vanda
- genus of showy epiphytic orchids of Himalayas to Malaysia
Genus Vanilla
- large genus of tropical climbing orchids; Old and New Worlds