Herbs erect. Stem solitary, to 1 m, retrorse fine strigose. Petiole 3-4 cm, ± winged toward apex; leaf blade ovate, 10-16 × 4-7 cm, adaxially dark green, sparsely and finely strigose, densely so on veins, abaxially densely golden glandular, finely strigose along veins, base broadly cuneate, attenuate-decurrent along petiole, margin crenate-serrate, apex acute. Verticillasters (4-)6-13-flowered, subglobose, 1.5-1.8 cm in diam. in bud; bracteoles subulate, ca. 1 mm, early deciduous. Pedicel ca. 1.5 mm, strigose. Calyx obconical, ca. 4 mm, strigose, glandular or sometimes subglabrous, glabrous inside, conspicuously 10-veined; teeth equal, triangular, ca. 1 mm, apex acute. Corolla yellow or white, ca. 1.3 cm; tube slender, straight, cylindric, slightly longer than calyx tube, glabrous, villous annulate inside; upper lip elliptic, apex 2-lobed, sparsely pubescent outside; middle lobe of lower lip trapeziform, emarginate; lateral lobes ovate. Ovary apex pubescent. Fl. May-Jun.

* Shady areas in dense forests, forest margins; ca. 100 m. Hainan.