Description from Flora of China
Herbs perennial, climbing. Rhizomes absent. Lateral branches penetrating leaf sheaths. Leaves alternate. Inflorescences borne at each node, opposite leaves, emerging from mouth of leaf sheath, each a large panicle of numerous cincinni; cincinni each subtended by an involucral bract; bracts similar to leaves, becoming smaller toward apex of cincinnus. Flowers actinomorphic, those of basal cincinnus bisexual, others male or bisexual. Sepals free, boat-shaped, galeate at apex. Petals free, linear-spatulate, white. Stamens 6, all fertile, equal; filaments densely torulose-hairy; anther locules parallel, ellipsoid, longitudinally dehiscent. Ovary 3-loculed; ovules 2 per locule. Capsule 3-valved, ellipsoid, beaked; seeds 2 per valve, rugose; hilum linear.
One species: Bhutan, China, India, Japan, Korea, Laos, Myanmar, Sikkim, Thailand, Vietnam.