Habit: terrestrial herbs

Rhizome: retrose or transverse or creeping or ascending, noded

Leaf: characteristics: sheathing or noding at base, petiolate

Inflorescence: type: raceme

Inflorescence: position: terminal or subterminal

Flower: other characteristics: resupinate

Sepal: dorsal sepal connivent with petals forming a hood, lateral sepals spreading or oblique or reflexed or connivent

Labellum: with sac or spur or auricles at base

Column: with wing or triangular-falcate or arm-shaped or subulate appendages

Anther: lanceolate

Rostellum: 2-lobed or beaked

Pollinia: number: 2

Pollinia: other characteristics: granular-farinaceous, 2-parted, with caudicle or viscidium