Habit: epiphytic herbs

Leaf: characteristics: 2, petiolate

Inflorescence: type: raceme

Flower: other characteristics: pendulous

Sepal: free or similar, abaxially keeled

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

Fruit:type: capsule

Fruit:shape: elliptic