Habit: epiphytic herbs

Leaf: characteristics: sheathing or noding at base, margin recurved or apex lobed

Leaf: position: in two rows

Inflorescence: type: raceme

Inflorescence: position: laterally on stem

Inflorescence: other characteristics: unbranched, peduncle and rachis with winged ribs or sheath, decumbent

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

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

Column: with column foot, without appendage

Rostellum: 2-lobed or beaked

Pollinia: number: 2

Pollinia: shape: globose or subglobose

Pollinia: other characteristics: with caudicle or viscidium

Stipe: shape: obovate or subobovate

Viscidium:shape: triangular or subtriangular