Habit: terrestrial herbs

Tuber: present

Stem: with leaves

Leaf: characteristics: 1, several to many, sheathing or noding at base

Leaf: position: alternate, opposite or subopposite, basal, rosette or cauline

Leaf: shape: ovate, lanceolate, elliptic

Inflorescence: type: raceme

Inflorescence: position: terminal or subterminal

Floral bract: lanceolate or ovate

Flower: other characteristics: resupinate

Sepal: dorsal sepal connivent with petals forming a hood, concave, 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: with 2 arms

Pollinia: number: 2

Staminode: 2

Pollinia: shape: subclavate or ovate

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

Fruit:type: capsule

Fruit: other characteristics: erect