Stem: without leaf, with scalelike sheath or roots

Inflorescence: type: raceme

Sepal: free or similar, with petals connate into a tube

Petal: base connivent to sepals or with claw

Labellum: with sac or spur or auricles at base, 3-lobed, not lobed

Column: without column foot

Pollinia: number: 4

Pollinia: other characteristics: with caudicle or viscidium, with stipe