Habit: epiphytic herbs

Stem: with leaves

Leaf: characteristics: conduplicate, sheathing or noding at base

Inflorescence: type: raceme

Inflorescence: position: laterally on stem

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

Column: with column foot

Pollinia: number: 2

Pollinia: shape: globose or subglobose

Pollinia: other characteristics: with caudicle or viscidium