Lianas woody, large, latex white. Leaves opposite. Cymes corymbose, terminal and axillary, long pedunculate. Calyx glandular between sepals. Corolla salverform; tube terete, constricted below middle, with densely antrorse setae; lobes narrowly elliptic, overlapping to left. Stamens inserted near base of corolla tube; filaments short; anthers sagittate, included, adherent at middle to pistil head, cells spurred at base; disc fleshy, 5-partite, lobes nearly 4-angled, as long as ovary. Carpels 2, connate. Ovaries semi-inferior or nearly inferior; ovules numerous in each carpel. Style cylindric, dilated at apex; pistil head conical. Follicles 2, narrowly fusiform, connate, parted distally when mature. Seeds narrowly elliptic, short beaked, coma silky.

One species: endemic to China.