Herbs perennial. Rhizomes horizontal, stoloniferous. Stems purplish, ascending, 30-70 cm tall, antrorsely puberulent, especially along angles, leafless on basal 1/3. Petiole 3-10 mm; leaf blade ovate to ovate-lanceolate, 1.5-3(-4.5) × 1-2(-2.5) cm, herbaceous, adaxially sparsely puberulent especially on margin, abaxially glabrous, midrib and veins puberulent, base broadly cuneate or subtruncate to cordate, margin 3-or 4-dentate, apex acuminate. Racemes terminal on apical branches, (1-)2-9 cm; bracts petiolate, leaflike, longer than pedicels. Pedicel 2-3 mm, puberulent or glandular pubescent. Calyx ca. 2.5 mm, to 4 mm in fruit, puberulent to glandular pubescent outside; scutellum ca. 1.5 mm, to 3 mm in fruit. Corolla purple, to 2.5 cm, glandular pubescent outside, glabrous inside, base slightly saccate-geniculate, throat to 4 mm wide; middle lobe of lower lip triangular-ovate, to 4 mm wide, margin subentire; lateral lobes ovate, ca. 3 mm wide, apex emarginate. Nutlets black, ovoid, ca. 0.5 mm in diam., tuberculate, adaxially umbonate at base. Fl. Jun-Jul.
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