Habit: terrestrial herbs

Rhizome: with tufted roots

Leaf: characteristics: sheathing or noding at base

Leaf: position: basal, rosette or cauline

Leaf: shape: elliptic

Inflorescence: type: raceme, spikelike

Inflorescence: position: terminal or subterminal

Inflorescence: other characteristics: spirally twisted

Flower: other characteristics: resupinate

Sepal: free or similar, dorsal sepal connivent with petals forming a hood

Labellum: 3-lobed

Column: cylindrical, with column foot

Anther: 2-loculed

Stigma: 2

Rostellum: 2-lobed or beaked

Pollinia: number: 2

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