Stems single or numerous, basally unbranched or few branched, 16-55 cm, densely retrorse puberulent at apex, sparsely puberulent or glabrate basally. Petiole 2.5-5 cm; leaf blade broadly ovate, 0.8-23 × 0.8-23 cm, pubescent, base cordate, subtruncate, or broadly cuneate, margin acute serrate or denticulate, apex obtuse or acute. Verticillasters 8-12-flowered, in upper leaf axils; bracts elliptic to obovate, 3-5 mm, margin entire, ciliate, apex acute. Calyx purplish, 9-10 mm, veins pubescent, margin ciliate, indistinctly 2-lipped 1/4-1/3 its length; middle tooth of upper lip obovate, apex short spinescent, 2.5-3 × wider than other teeth, lateral teeth lanceolate; lower lip teeth lanceolate, apex spinescent-acuminate, with spines 1-2 mm. Corolla blue-purple, 1.2-1.9 cm, pubescent, upper lip slightly shorter than lower lip. Fl. Jul-Sep.
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