Description from Flora of China
Plants perennial. Rhizomes elongate, with scales and buds. Leaves alternate. Flowers usually solitary, axillary, pedicellate. Calyx 5-lobed. Corolla funnelform-campanulate, 5-lobed to middle or slightly beyond. Stamens 5, free from corolla; filaments ciliate. Ovary inferior, 3-locular; style villous above; stigma 3-lobed, lobes recurved. Fruit a 2- or 3-locular irregularly dehiscent capsule. Seeds relatively few, ellipsoid, large, smooth.
One species: Bhutan, China, India, Japan, Korea, Myanmar, Nepal, Papua New Guinea, Philippines, Russia (Sakhalin), Thailand.
(Authors: Hong Deyuan (洪德元); Thomas G. Lammers)