Habit: saprophytic herbs
Rhizome: noded, cylindrical
Stem: without leaf, noded, with scalelike sheath or roots
Inflorescence: type: raceme
Inflorescence: position: terminal or subterminal
Flower: other characteristics: resupinate
Petal: base connivent to sepals or with claw
Labellum: adnate to column
Pollinia: number: 2
Pollinia: other characteristics: granular-farinaceous, neither caudicle nor viscidium
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