Habit: terrestrial herbs

Tuber: present, globose or ellipsoid, not lobed, its neck with roots

Stem: sheathing below middle, with leaves

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

Leaf: position: tufted

Inflorescence: type: raceme

Inflorescence: position: terminal or subterminal

Flower: other characteristics: resupinate

Sepal: free or similar, 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, 3-lobed

Column: with auricles

Anther: 2-loculed

Stigma: convex, 2

Rostellum: with 2 arms

Pollinia: number: 2

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