Rhizomes short, 7-8 mm in diam. Stems ascending to suberect, 10-15 cm, densely retrorse pubescent, with 2 or 3 nodes below inflorescences. Petiole of basal leaves 2-6.7 cm, that of cauline leaves to 2.1 cm; leaf blade ovate to circular-ovate, 1.5-5(-6.5) × 1.8-4 cm, adaxially subglabrous, abaxially densely white tomentulose or silky-pubescent along veins, base cordate to deeply so, margin crenate, apex rounded. Verticillasters in ca. 3 cm capitula; bracts purple-green, rhombic-obovate, to oblate, to 2 cm, densely villous along veins, margin ciliate, acute or short spinescent to 3-5-serrate. Calyx 1.8-2 cm, silky-villous along veins, sparsely villous inside, margin lanate-ciliate, 2-lipped to 1/2 its length; upper lip middle tooth elliptic-obovate or subtrapeziform, 3-4 × as wide as lateral teeth, margin entire or irregularly denticulate-spinescent, apex truncate-rounded to rounded; lateral teeth lanceolate, apex spinescent-acuminate; lower lip teeth similar to lateral teeth of upper lip but narrower. Corolla dark blue, 2-2.4 cm, pubescent; upper lip ca. 5 mm, lower lip ca. 2 × as long as upper lip. Fl. Jul-Aug.
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