Habit: epiphytic herbs

Stem: noded

Leaf: characteristics: sheathing or noding at base, apex notched or acute or obtuse or hooked

Leaf: position: distichous

Inflorescence: position: laterally on stem

Flower: other characteristics: spreading

Sepal: free or similar

Petal: shorter or smaller than sepals

Labellum: with sac or spur or auricles at base, 3-lobed, adnate to column

Column: without column foot, puberulous or pubescent

Pollinia: number: 4

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

Viscidium: other characteristics: wider than stipe