Habit: epiphytic herbs

Stem: sheathing above middle, with scalelike sheath or roots

Leaf: characteristics: sheathing or noding at base

Leaf: position: in two rows

Inflorescence: position: laterally on stem

Floral bract: small

Inflorescence: other characteristics: branched, unbranched

Sepal: lateral sepals spreading or oblique or reflexed or connivent

Petal: base connivent to sepals or with claw

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: cuneate