Description from Flora of China
Herbs prostrate to erect. Leaves subsessile to short petiolate; leaf blade long lanceolate to ovate, margin serrate. Cymes axillary, dichotomous with helicoid branches, pedunculate. Flowers pedicellate, declinate after anthesis. Calyx campanulate, inconspicuously 10-veined, slightly dilated in fruit; teeth 5, subequal or posterior tooth smaller. Corolla purplish red or white, long exserted, dilated above middle, not hairy annulate inside, 2-lipped; upper lip straight, apex rounded; lower lip larger, 3-lobed, middle lobe largest. Stamens 4, anterior 2 longest, all ascending, underlying upper lip of corolla; anthers subglobose, 2-celled, cells apically tufted hairy or on both ends. Ovary glabrous. Style filiform, apically equally 2-cleft. Nutlets black, 1(-3), drupelike, subglobose; exocarp fleshy, thickened, cuticular when dry.
Two species: endemic to China.