Herbs perennial. Stems erect, 50-100 cm, densely yellowish or gray tomentose, base glabrescent, unbranched. Petiole 1-2.5 cm; leaf blade broadly ovate, 12-14 × 6.5-9.5 cm, adaxially sparsely pubescent, densely so on veins, abaxially densely yellowish or gray-white tomentose, base broadly cuneate to rounded, margin coarsely crenate-dentate, apex acute. Verticillasters widely spaced, (2-)4-10-flowered; bracteoles needlelike, ca. 1 mm. Pedicel 1-2 mm. Calyx obconical, ca. 1.1 cm, densely pubescent, glabrous except for pubescent teeth inside, 10-veined; teeth triangular-subulate, ca. 3 × 1.5 mm, apex subulate-acuminate, conspicuously reflexed after anthesis. Corolla dark-purple when dry, ca. 1.4 cm; tube ca. 8 mm, cylindric to slightly dilated at throat, densely gray pubescent, base glabrous, pilose annulate inside lower lip; upper lip oblong, ca. 6 × 2 mm, slightly concave; lower lip obliquely patent, ca. 5.5 × 5 mm; middle lobe ca. 2 mm wide, densely pubescent at middle, margin entire; lateral lobes ca. 1.5 mm, margin entire. Nutlets brown, triquetrous, oblong, ca. 2 × 1.2 mm, adaxially ribbed, rounded, basally broadly cuneate, glabrous. Fl. Aug, fr. Sep.
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