Lianas woody, latex white. Leaves opposite. Cymes terminal, corymbose or paniculate. Calyx deeply divided, basal glands inside present or absent. Corolla salverform; tube cylindric, ca. 5 as long as sepals, inflated at base; throat villous, not scaly; lobes overlapping to right. Stamens inserted below middle of corolla tube; filaments short; anthers sagittate, included, adherent at middle to pistil head, cells with an empty tail; disc deeply 5-lobed, longer than ovary. Carpels 2, distinct. Ovaries half-inferior or nearly inferior; ovules numerous in each carpel. Style filiform; pistil head long conical. Follicles 2, terete, free. Seeds oblong or narrowly so, flat, comose.

About 14 species: SE Asia, one species in China.