Rhizomes ascending or horizontal. Stems ascending, 10-30 cm, purplish at apex, retrorse pubescent. Petiole much shorter than blade; leaf blade broadly ovate to ovate, 0.6-2 × 0.4-1.5 cm, pubescent especially along veins, base abruptly cuneate to shallowly cordate, margin deeply crenate-dentate, apex obtuse. Verticillasters in subellipsoid spikes 2-6 × 2 cm; bracts obtriangular, margin 3-5-spinescent-dentate, with spines 2-4 mm. Calyx ca. 1 cm, middle tooth of upper lip ca. 2 × wider than lanceolate lateral teeth, teeth of lower lip lanceolate. Corolla yellowish white, ca. 1.5 cm, densely pubescent outside. Nutlets oblong, ca. 3 × 1.2 mm. Fl. Jul-Aug.
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