Habit: terrestrial herbs

Tuber: present, cylindrical

Stem: with leaves

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, not lobed

Anther: 2-loculed

Stigma: 1

Pollinia: number: 2

Staminode: 2

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