Plants rhizomatous, perennial. Stems erect, 16-50 cm, tinged purple-red, base sparsely glandular pubescent, apex densely glandular pubescent. Petiole 6-13 mm; leaf blade ovate, 2.3-4 × 2.2-2.5 cm, papery, glabrous or subglabrous, densely puberulent along veins adaxially, base rounded, margin deeply projected dentate, apex acute. Verticillasters 10-14-flowered, in continuous terminal panicles; peduncle 1-5 mm; floral leaves conspicuously reduced except for lowest, to as long as calyx, bractlike; bracts needlelike, few, 2-3 mm, ciliate. Pedicel 0.5-3 mm. Calyx narrowly tubular, 5-6 mm, glandular, veins white ciliate; upper 3 teeth narrowly triangular, reflexed in fruit; lower 2 triangular-subulate, spreading, ca. 2/3 as long as calyx. Corolla white or purplish, 8-9 mm, puberulent, throat ca. 2 mm wide, upper lip ca. 1 mm. Nutlets yellow-brown, obovoid, ca. 0.8 × 0.6 mm.
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