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