Terrestrial or epiphytic herbs with tuberous
rhizomes, pseudostems up to 2 m tall. Leaves usually oblong-lanceolate.
Inflorescence terminal spike, densely many-flowered. Bracts imbricate or lax, 1 or more flowered,
bracteoles tubular. Calyx tubular, split on one side. Corolla-tube subequal or
exceeding bract, lobes rolled, drooping. Staminodes petaloid, usually subequal
to corolla lobes, but wider. Labellum conspicuous, generally bilobed, base
cuneate. Stamens exserted, anther thecae
free. Ovary trilocular, placentation axile, ovules many. Fruit capsule, globose
or oblong, with lacerate aril, usually bright red.