Habit: epiphytic herbs

Stem: with leaves, with scalelike sheath or roots

Leaf: characteristics: conduplicate, sheathing or noding at base, apex notched or acute or obtuse or hooked, base clasping

Leaf: position: in two rows

Leaf: shape: base V-shaped

Inflorescence: position: arising from leaf axil

Inflorescence: other characteristics: decumbent

Petal: shorter or smaller than sepals, similar to 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, with slit

Viscidium: other characteristics: wider than stipe