Habit: epiphytic herbs

Rhizome: retrose or transverse or creeping or ascending, noded

Pseudobulb: with leaves

Leaf: characteristics: petiolate

Leaf: shape: lanceolate, elliptic, oblong

Inflorescence: type: raceme

Scape: emerging from center of leaves or pseudobulb base or rhizome

Flower: other characteristics: pendulous

Sepal: free or similar

Petal: narrower than sepals or as long as dorsal sepal

Labellum: 3-lobed, with longitudinal ridges or keels, not 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: other characteristics: winged or ribbed