Herbs perennial. Leaf margin crenate-serrate. Inflorescence corymbose, lax, terminal, long pedunculate. Flowers 4-merous, minute. Calyx tube subglobose; lobes spreading, small. Corolla narrowly funnelform; lobes imbricate. Anthers linear-oblong; pollen grains 5- or 6-colpate. Ovary with placentas ascending from inner base of each locule; style prolonged; stigma clavate or fusiform, 2-lobed. Fruit a 2-valved dry capsule.

Three species: China, E Himalaya, NE India, Indonesia (Sumatra), Myanmar, N Thailand, Vietnam; one species in China.