Plants perennial. Stems 25-50 cm, yellow-brown tomentose-villous or glabrescent. Petiole 9-21 cm; leaf blade ovate, 4-15 × 2-10 cm, adaxially minutely hispid to densely pilose, abaxially gray tomentulose to subglabrous, sparsely yellow-brown glandular, base cordate, margin crenate, apex acute. Inflorescences densely yellow-brown villous, glandular pilose; verticillasters 2-4-flowered, compact, in terminal racemes; bracts broadly ovate to subcircular, 1-2.4 cm, obtuse, base rounded, apex mucronate. Pedicel ca. 3 mm. Calyx ± narrow campanulate, 1.3-1.5 cm, yellow villous, 2-lipped nearly ca. 1/3 its length; upper lip broadly semicircular-triangular, ca. 3.5 × 9 mm, apex mucronate; lower lip subequal adaxial, ca. 8 mm wide; teeth triangular-ovate, apex mucronate; fruiting calyx slightly dilated, ca. 1.7 cm, veins conspicuously elevated outside. Corolla purple-brown or red, 2.8-3.5 cm, pilose; tube imperfectly pilose annulate inside, cylindric, ca. 3.5 mm wide at base, to 9 mm wide at throat; upper lip straight, slightly concave or falcate, ca. 7 mm; lower lip slightly longer than upper, middle lobe obcordate, ca. 4 × 6 mm. Filaments ca. 5.5 mm; connectives 6-7 mm, arcuate, upper arms slightly longer than lower. Nutlets dark brown, obovoid, ca. 4 mm, rounded, abaxially striate. Fl. May-Nov, fr. Nov.
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