Rhizomes slender, trailing. Stems 20-40 cm, finely striate, densely retrorse gray puberulent. Petiole 0.5-2 cm; leaf blade narrowly ovate, (1.5-)2-5 × (0.8-)1.5-3 cm, ± membranous, sparsely fine pilose, base cuneate-attenuate to rounded, margin 3-8-serrate or crenate-serrate, apex obtuse to acute. Verticillasters 6-12-flowered, to 4 cm in diam.; peduncle 4-8 mm; floral leaves longer than verticillasters; bracts linear-subulate, 5-7 mm, distinctly ribbed, white ciliate. Pedicel 2-5 mm. Calyx narrowly tubular, slightly curved, ca. 1 cm, glandular, white hispid along veins, throat sparsely hispid, sometimes tinged purple-red; teeth awned, upper 3 reflexed, triangular, lower 2 straight, subulate. Corolla rose with purple spots, 1.5-2 cm, puberulent; tube ca. 1.5 mm wide at base, to 5 mm wide at throat. Nutlets dark brown, globose-ovoid, ca. 1.2 mm in diam., smooth. Fl. Aug-Sep, fr. Sep-Oct.
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