Habit: terrestrial herbs

Rhizome: retrose or transverse or creeping or ascending, noded, stemlike

Stem: leafy

Leaf: characteristics: sheathing or noding at base, petiolate

Inflorescence: type: raceme

Inflorescence: position: terminal or subterminal

Sepal: free or similar, dorsal sepal connivent with petals forming a hood, lateral sepals dilated or saccate at base or bent downward

Petal: narrower than sepals or as long as dorsal sepal

Labellum: with sac or spur or auricles at base

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

Anther: 2-loculed

Stigma: 2

Rostellum: 2-lobed or beaked

Pollinia: number: 2

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

Fruit:type: capsule

Fruit: other characteristics: erect