Habit: epiphytic herbs

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

Leaf: position: in two rows

Inflorescence: position: arising from leaf axil, laterally on stem

Inflorescence: other characteristics: unbranched

Flower: other characteristics: spreading

Sepal: lateral sepals spreading or oblique or reflexed or connivent

Petal: narrower than sepals or as long as dorsal sepal

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

Stipe: shape: tapelike

Viscidium: other characteristics: wider than stipe