Habit: epiphytic herbs

Stem: with leaves

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

Leaf: position: distichous

Inflorescence: type: raceme

Inflorescence: other characteristics: unbranched

Flower: other characteristics: spreading

Sepal: free or similar, abaxially keeled

Petal: shorter or smaller than sepals, similar to sepals, broader than sepals

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

Column: without column foot

Pollinia: number: 2

Pollinia: shape: globose or subglobose

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

Viscidium: other characteristics: wider than stipe