Habit: epiphytic herbs

Stem: noded, with scalelike sheath or roots

Leaf: characteristics: sheathing or noding at base, base clasping

Leaf: position: in two rows

Inflorescence: position: arising from leaf axil, opposite leaf

Inflorescence: other characteristics: branched, unbranched

Petal: shorter or smaller than sepals

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

Column: with column foot

Pollinia: number: 2, 4

Pollinia: shape: globose or subglobose

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

Stipe: shape: obovate or subobovate, lanceolate