Plants perennial. Stems erect, ca. 1.5 m, robust, densely glandular hispid, much branched. Petiole 7 cm to obsolete, densely rusty tomentose-villous; leaf blade obovate, to 35 × 25 cm, papery, sparsely villous, base rounded to broadly cuneate, margin remotely deep undulate-lobulate; lobes rounded, ca. 4 mm wide, apex rounded. Inflorescences densely glandular pilose; verticillasters 2-flowered, widely spaced, forming much-branched terminal panicles; bracts ovate, acuminate, base rounded, to ca. 5 mm. Pedicel 1-5 mm. Calyx campanulate, 1.3-1.7 cm, glandular pubescent, sparsely red-brown glandular, tube 8-10 mm; upper lip shallowly 3-toothed, middle tooth smaller than lateral; lower lip slightly longer than upper, deeply 2-toothed, teeth triangular. Corolla purple-red except yellowish at base, ca. 2.4(-3) cm; tube straight, nearly exserted, gradually dilated upward, apex glandular pilose, without hairy annulus inside; upper lip oblong, ca. 5 × 4 mm, slightly falcate, densely glandular pilose, lower lip as long as upper, to 1 cm wide; middle lobe obcordate, ca. 4 × 5 mm; lateral lobes ovate, ca. 3 mm wide. Filaments ca. 4 mm; connectives nearly straight, ca. 1 cm, lower arms shorter than upper. Nutlets brown, ovoid, ca. 4 mm. Fl. and fr. Oct.
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