Plants perennial. Stems 30-45 cm, densely brown pilose. Petiole of stem leaves to 3 × as long as blades; leaf blade cordate-ovate, 5-10 × 3.5-7.5 cm, adaxially densely pilose, abaxially pilose especially along veins, sparsely brownish glandular, glabrescent, base cordate, margin dentate-crenate, apex acute to short acuminate. Verticillasters 2-4-flowered, widely spaced, lower ones longer than calyx, upper shorter, in terminal racemes or panicles 7-20 cm; rachis pilose; bracts ovate. Pedicel to 4 mm, pilose. Calyx campanulate, 1-1.4 cm, densely pubescent, intermixed with red-brown glands; upper lip broadly triangular-ovate, ca. 4 × 5 mm, apex short acuminate; lower lip 5.5-6 × 5 mm, teeth triangular, apex long acuminate; fruiting calyx dilated, membranous, conspicuously veined, glabrescent, mouth ca. 1.2 cm wide, upper margin 1-3 cm, lower margin ca. 1.5 cm. Corolla purple or white, purple spotted or yellow on limb, 2.5-3.5 cm, pubescent; tube pilose annulate inside, 2-4.2 cm, adaxially gradually dilated, to 6 mm wide at throat; upper lip straight, emarginate; middle lobe of lower lip subcircular. Filaments 5-6 mm; connectives arcuate, 4-5 mm, arms subequal. Style slightly exserted. Fl. Jun-Jul.
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