Habit: epiphytic herbs

Stem: with leaves

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

Leaf: position: alternate, distichous

Inflorescence: type: raceme

Inflorescence: position: laterally on stem

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

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

Petal: shorter or smaller than sepals

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

Column: with column foot

Rostellum: 2-lobed or beaked

Pollinia: number: 2

Pollinia: shape: globose or subglobose

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

Viscidium: other characteristics: wider than stipe