Habit: saprophytic herbs

Rhizome: with aerial roots

Stem: without leaf, with scalelike sheath or roots

Inflorescence: type: raceme

Inflorescence: position: terminal or subterminal

Flower: other characteristics: resupinate, solitary

Sepal: dorsal sepal connivent with petals forming a hood

Petal: base connivent to sepals or with claw

Labellum: 3-lobed, not lobed

Column: with column foot, with auricles

Pollinia: number: 4

Pollinia: other characteristics: granular-farinaceous, without caudicle