Habit: saprophytic herbs

Tuber: present

Stem: without leaf, noded, with scalelike sheath or roots

Inflorescence: type: raceme

Inflorescence: position: terminal or subterminal

Flower: other characteristics: pendulous

Sepal: free or similar

Petal: similar to sepals, free

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

Column: without column foot

Pollinia: number: 2

Pollinia: other characteristics: granular-farinaceous, with caudicle or viscidium