Herbs erect. Stems 1-1.3 m, subglabrous to sparsely puberulent or pilose-strigose. Petiole 1-6 cm, slender; leaf blade broadly ovate to cordate-ovate, 4.5-12 × 2-7 cm, sparsely minutely hispid, abaxially distinctly glandular, base truncate to cordate, margin coarsely serrate-dentate, apex long acuminate, terminal tooth elongated. Verticillasters (2-)6-12-flowered; bracteoles subulate, ca. 2 mm. Pedicel less than 1 mm. Calyx 1-1.5 cm, long turbinate, dotted or subglabrous, minutely hispid or strigose on veins, conspicuously 8-10-veined; teeth shorter than tube, narrowly triangular or ovate, spinescent, anterior teeth much longer than posterior teeth. Corolla rose or purple to dark red, 1.5-3 cm, pubescent, sparsely scaly except for annulus inside; upper lip oblong-elliptic, ca. 5 mm, margin entire; middle lobe of lower lip oblong to obcordate, emarginate; lateral lobes subcircular. Nutlets chestnut brown, triquetrous, ovoid, adaxially ribbed. Fl. Jul-Aug, fr. Sep.
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