General: Root fascicled, Root tuberous

Leaf: shape: oblong, lanceolate

Leaf: other characteristics: ligule a curved line at junction of tubular leaf sheath and leaf blade

Petiole: absent

Bracts or bracteoles: 1-flowered or 2-flowered, bracteoles absent

Inflorescence: spike, terminal

Calyx: tubular, apex 3-lobed or 3-toothed, split on 1 side

Corolla lobes: central lobe longer and wider than lateral lobes

Labellum: apex lobed or cleft or concave or emarginate, reflexed

Stamens or staminodes: petaloid

Filament: short or absent

Anther: linear or oblong

Connective: exttende at base into a spur

Ovary: 3-loculed, ovules many per locule

Style: filiform or linear

Stigma: funnelform, margin ciliate

Fruit: cylindric or oblong, clavate

Seed: arillate