Habit: terrestrial herbs

Tuber: present, palmately lobed, its neck with roots

Stem: unbranched, sheathing below middle

Leaf: position: rosette or cauline

Inflorescence: type: raceme

Inflorescence: position: terminal or subterminal

Flower: other characteristics: resupinate

Sepal: dorsal sepal connivent with petals forming a hood

Petal: narrower than sepals or as long as dorsal sepal

Labellum: with sac or spur or auricles at base, 3-lobed

Anther: 2-loculed

Stigma: 1

Rostellum: with 2 arms

Pollinia: number: 2

Staminode: 2

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