Habit: epiphytic herbs

Stem: with leaves

Leaf: characteristics: sessile or subsessile, apex notched or acute or obtuse or hooked, margin recurved or apex lobed

Leaf: position: distichous

Inflorescence: type: raceme

Inflorescence: position: arising from leaf axil

Floral bract: lanceolate or ovate

Flower: other characteristics: spreading

Sepal: lateral sepals adnate to column foot or labellum forming a mentum

Petal: similar to sepals

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

Column: with column foot, without column foot

Stigma: concave

Rostellum: 2-lobed or beaked

Pollinia: number: 2

Pollinia: shape: globose or subglobose

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

Stipe: shape: tapelike