Habit: terrestrial herbs

Tuber: present

Stem: sheathing below middle, with leaves

Leaf: characteristics: sessile or subsessile, base clasping

Leaf: shape: ovate, cordate

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

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: concave, 1

Rostellum: ligulate or ovate or U-shaped or deltoid

Pollinia: number: 2

Staminode: 2

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

Fruit:type: capsule

Fruit:shape: elliptic

Fruit: other characteristics: glabrous