Herbs perennial, rhizomatous. Stems ascending to erect, 30-40(-60) cm tall, finely antrorse hairy especially on angles. Petiole 4-13 mm, densely pubescent; leaf blade ovate to triangular-ovate, 1.2-2.5 × 0.7-2.1 cm, herbaceous, adaxially sparsely fine pubescent, abaxially subglabrous or pubescent, veins pilose, base broadly-cuneate to subtruncate, margin coarsely 1-3-dentate, apex obtuse; apical blades bractlike, margin entire or 1-or 2-crenate. Flowers solitary, axillary, obliquely spreading, secund. Pedicel 1.8-3 mm, pubescent. Calyx 2-3 mm, ca. 4 × 3 mm in fruit, sparsely pubescent, ciliolate, glandular; scutellum ca. 1 mm, ca. 2 mm in fruit. Corolla purple or purplish blue, 1.6-3.5 cm, pubescent outside, glabrous except for villous base inside; tube base bent, slightly dilated, throat ca. 4 mm wide; middle lobe of lower lip projected, trapeziform, ca. 2.5 × 3 mm, apex emarginate; lateral lobes ovate, to 1/2 as long as lower lip; ovary bullate hairy at juncture with disc. Nutlets dark brown, ovoid, ca. 1 × less than 1 mm, tuberculate, adaxially swollen, umbonate near base. Fl. Apr-Jun, fr. Jun-Jul.
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