Herbs perennial. Stems slender, base prostrate or stoloniferous, ascending-erect, 10-20(-45) cm, pubescent. Leaves larger basally; petiole 0.5-2.5 cm, shorter toward apex; leaf blade cordate to oblong-ovate, 2.5-15 × 2-4.5 cm, papery, adaxially sparsely strigose, abaxially pilose, base cordate, margin crenate to obtuse serrate, apex apiculate. Verticillasters 2-(to many) flowered, at upper 1-3 nodes or in a terminal raceme; bracts reduced toward stem apex, narrowly ovate to sublanceolate, margin dentate; bracteoles ca. 1 mm. Pedicel 2-6 mm. Calyx tubular, 1.5-1.8 cm, densely puberulent, upper lip longer; teeth ovate-triangular to narrowly triangular, sometimes slightly curved, 2-3 mm, ciliate, apex acuminate. Corolla reddish to purple-red, 2.8-4.5 cm, pubescent; tube straight, tubular, gradually dilated at apex; limb partly villous inside; upper lip straight, lobes circular to oblong; middle lobe of lower lip subcircular, margin undulate; lateral lobes oblong to circular, 1/2 as long as middle lobe. Nutlets unknown. Fl. Apr-Jun, fr. Jul.
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