Description from Flora of China
Shrubs erect. Stems much branched; branches densely floccose-strigose. Petiole ± narrowly winged; leaf blade ovate to ovate-rhombic, margin dentate. Cymes axillary, dichotomous or helicoid, pedunculate, lax; bracts subulate to oblanceolate, persistent, minute. Calyx erect, campanulate, inconspicuously 10-veined, suburceolate and conspicuously veined in fruit; teeth 5, equal, triangular, apically acute. Corolla white, tube cylindric, straight, slightly exserted, somewhat bearded annulate inside, 2-lipped; upper lip erect, slightly concave, entire; lower lip enlarged, spreading, 3-lobed, middle lobe largest. Stamens 4, exserted from upper lip of corolla, anterior 2 longer; anther cells 2, divaricate. Ovary apically hairy. Style unequally 2-cleft. Nutlets obovoid, conspicuously pitted, areole lateral and large.
Three species: China (Hainan), Indonesia, Malaysia, Myanmar, Philippines, Vietnam; two species in China.