Habit: epiphytic herbs

Rhizome: with fibrous roots

Pseudobulb: with leaves

Leaf: characteristics: 2, petiolate

Inflorescence: type: raceme

Scape: emerging from center of leaves or pseudobulb base or rhizome, with sheath

Sepal: free or similar, lateral sepals dilated or saccate at base or bent downward, abaxially keeled

Petal: narrower than sepals or as long as dorsal sepal

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

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

Stigma: concave

Pollinia: number: 4

Pollinia: shape: obovate

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

Fruit:type: capsule

Fruit: other characteristics: with 3 or 6 ridges, with persistent column