Stolons ascending. Stems to 25 cm, sparsely floccose-villous. Petiole of upper leaves 1.5-2 × as long as blade, densely villous; leaf blade of basal leaves reniform, villous; upper blade cordate-reniform, 1-3.5 × 1.5-5 cm, adaxially hirtellous, abaxially purplish, sparsely puberulent, red glandular, veins spreading hirtellous, margin remotely mucronate-crenate, apex obtuse. Verticillasters inserted in middle axils, 2(-4)-flowered; peduncle less than 5 mm, villous; bracts and bracteoles linear-subulate, ciliate. Pedicel ca. 3 mm, villous. Calyx tubular 1-1.2 cm, finely glandular, veins sparsely villous; teeth triangular-lanceolate, 3.5-4 mm, apex spinescent, ciliate. Corolla reddish or bluish, straight, funnelform, 2.5-2.7 cm, ± pilose; upper lip straight; middle lobe of lower lip subcircular, margin undulate, apex emarginate; lateral lobes ovate, as long as upper lip. Nutlets ca. 2 × 1 mm, base slightly triquetrous, apex subrounded, smooth, slightly shiny. Fl. Apr-May, fr. Jun.
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