Habit: epiphytic herbs
Stem: branched, unbranched, with scalelike sheath or roots
Leaf: characteristics: 1
Inflorescence: position: terminal or subterminal
Sepal: free or similar, lateral sepals adnate to column foot or labellum forming a mentum
Petal: narrower than sepals or as long as dorsal sepal
Labellum: 3-lobed, not lobed
Column: with column foot
Pollinia: number: 8
Pollinia: other characteristics: with caudicle or viscidium
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