Habit: epiphytic herbs

Stem: with leaves, with scalelike sheath or roots

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

Leaf: position: distichous, tufted

Inflorescence: type: raceme, panicle

Inflorescence: position: laterally on stem

Flower: other characteristics: spreading

Sepal: lateral sepals adnate to column foot or labellum forming a mentum

Petal: shorter or smaller than sepals

Labellum: with sac or spur or auricles at base, 3-lobed, with longitudinal ridges or keels

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