Habit: epiphytic herbs

Stem: with scalelike sheath or roots

Leaf: characteristics: conduplicate, sheathing or noding at base, apex notched or acute or obtuse or hooked, margin recurved or apex lobed

Leaf: position: distichous

Leaf: shape: base V-shaped

Inflorescence: type: raceme

Inflorescence: position: laterally on stem

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

Flower: other characteristics: spreading

Sepal: lateral sepals spreading or oblique or reflexed or connivent

Petal: similar to sepals, narrower than sepals or as long as dorsal sepal

Labellum: with sac or spur or auricles at base, 3-lobed, adnate to column, not lobed

Column: with column foot

Pollinia: number: 2

Pollinia: shape: globose or subglobose

Pollinia: other characteristics: with caudicle or viscidium, 2-lobed or 4-lobed, with stipe

Viscidium: other characteristics: wider than stipe