Herbs perennial, rhizomatous. Stems prostrate-ascending, 30-50 cm, sparsely fine strigose, dark purple, much branched. Petiole 0.5-5 cm; leaf blade ovate to lanceolate, 0.5-9(-17) × 0.3-3(-4.5) cm, adaxially shiny, sparsely minutely hispid, abaxially glabrous, finely puberulent on veins, base cuneate-decurrent, margin serrate, apex acute to acuminate, rarely obtuse. Raceme terminal, 6-10 cm, lax, densely puberulent, capitate glandular; verticillasters 2(-6)-flowered; peduncle ca. 2 mm; bracts lanceolate to linear, to 1.2 cm; bracteoles subulate, 1-3 mm. Pedicel 4-10 mm. Calyx campanulate, to 3 mm, glandular puberulent, obscurely 10-veined; teeth subequal, triangular, apex subulate, posterior tooth slightly larger. Corolla purple-blue, funnelform-tubular, to 2.5 cm; tube ca. 1.9 cm, throat ca. 1 cm wide, puberulent; limb glabrous inside, upper lip ca. 3 mm; lower lip ca. 6 mm, spreading, lobes elliptic. Stamens distinctly exserted. Fl. Sep-Oct.
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