Leaf: other characteristics: leaf base cordate, subsagittate

Petiole: present

Bracts or bracteoles: bracteoles present

Inflorescence: spike, terminal

Calyx: tubular, apex 2-lobed or 2-toothed, apex 3-lobed or 3-toothed, split on 1 side

Corolla: longer than calyx

Corolla lobes: central lobe longer and wider than lateral lobes

Labellum: oblong or spatulate, apex lobed or cleft or concave or emarginate, base adnate to filament forming a tube

Stamens or staminodes: lateral staminode absent or very short

Filament: exserted from or above corolla, distally grooved

Ovary: 3-loculed, placentation axile, ovules biseriate

Style: filiform or linear

Stigma: margin ciliate

Fruit: globose, 3-valved, dehiscent, indehiscent