Herbs perennial. Stems robust, 80-100 cm tall, erect, to 4 mm in diam., apically densely glandular puberulent. Mid stem leaves petiolate; petiole 0.5-3.5 cm; leaf blade triangular-ovate, to 6 × 4 cm, ± papery, densely puberulent especially on midrib and lateral veins abaxially, base cordate to subtruncate, margin crenate-serrate to double crenate-serrate, apex acute. Racemes terminal, 6-15 cm. Pedicel 2-3 mm, densely glandular puberulent. Calyx ca. 2 mm in flower; scutellum ca. 1 mm. Corolla dark purple, ca. 1.6 cm, sparsely glandular puberulent outside, glabrous inside, base bent, saccate, throat to 4 mm wide; middle lobe of lower lip triangular-ovate, ca. 4 mm wide, apex emarginate; lateral lobes ovate, ca. 1.5 mm wide. Nutlets unknown. Fl. Jun-Jul, fr. Jun-Aug.
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