Herbs not or slightly drying black. Rhizomes absent; roots densely yellowish brown pubescent. Stems and branches slender. Branches and leaves opposite or occasionally alternate. Stem leaves ovate, rarely ovate-lanceolate. Calyx lobes 5, entire. Corolla less than 2 cm; galea ± straight to falcate, toothless, beakless; lower lip much shorter than to nearly as long as galea. Anthers acuminate.

Seven species: China, Myanmar, Sikkim; five species in China.