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Genus Rhyncostylis
- genus of epiphytic orchids of tropical Asia
Genus Sarcochilus
- diminutive epiphytic or lithophytic orchids with clumped short-stemmed foliage and arching racemes of colorful flowers; Australia and Polynesia to southeastern Asia
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