Habit: epiphytic herbs

Rhizome: with fibrous roots

Leaf: characteristics: 1, petiolate

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

Petal: similar to sepals, 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

Rostellum: ligulate or ovate or U-shaped or deltoid

Pollinia: number: 4

Pollinia: other characteristics: without appendage