Herbs annual. Stems erect, branched or not. Leaves alternate, petiolate, elliptic-ovate, strigose. Cymes ebracteate. Flowers short pedicellate. Calyx 5-parted to base; lobes subdivaricate, oblong, slightly enlarged in fruit. Corolla campanulate, glabrous; tube ca. as long as limb; throat with appendages. Stamens inserted slightly above middle of corolla tube, included; filaments extremely short. Ovary 4-parted. Style included. Gynobase flat. Nutlets tetrahedral; margin of abaxial surface exserted, becoming a cupular emergence; attachment scar at corner of 3 adaxial surfaces.

Two species: endemic in China.