Habit: saprophytic herbs

Rhizome: with fleshy roots

Stem: without leaf, 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: 3-lobed, adnate to column, not lobed

Column: with wing or triangular-falcate or arm-shaped or subulate appendages, without column foot, with auricles

Operculum: papillose

Pollinia: number: 4

Pollinia: other characteristics: without caudicle