Subshrubs to shrubs, 0.3-3 m tall. Branchlets terete, slender, striate, with sparse small lenticels, puberulent when young, glabrescent. Petiole 3-8 mm; leaf blade broadly ovate to ovate-rhomboid, 1.5-2.5(-5) cm, abaxially glandular, adaxially glabrous, base cuneate to broadly cuneate and slightly oblique, margin entire or coarsely serrate below middle, apex acuminate, veins 3 or 4 pairs. Inflorescences lax terminal thyrses, terminal flowers solitary, basal bracts leaflike, bractlets lanceolate. Calyx campanulate, 6-8 mm, 5-dentate, grayish glandular, outside with several disc-shaped black glands. Corolla bluish to reddish purple, base yellow, 3-4 cm, 2-lipped; lower lip 3-lobed, central lobe largest, hooded; upper lip entire or slightly 2-cleft, puberulent. Stamens slightly exserted. Ovary glabrous, sparsely glandular. Style ± as long as stamens, glabrous. Fruit black when dry, obovoid, 1-1.5 cm, longer than persistent calyx. Fl. May-Jul, fr. Jul-Sep.
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