Herbs perennial. Stems erect, 30-60 cm, pilose when young, glabrous or subglabrous except villous on nodes. Leaves subsessile at stem apex; petiole less than 10 cm, sometimes dilated at apex; leaf blade 4-13(-17) × 1.8-4(-10) cm, papery or ± membranous, adaxially puberulent, abaxially subglabrous, apex acuminate. Verticillasters 2-to many flowered, in terminal and lateral racemes 6-7 cm; bracts ovate-lanceolate or lanceolate, 3-6 mm, margin dentate; bracteoles subulate, ca. 1 mm. Pedicel 1-4 mm. Calyx narrowly tubular, opening slightly at mouth, 1-1.3 cm, puberulent, base saccate in fruit; teeth triangular, 3-4 mm, ciliate, apex acuminate, adaxial teeth longer. Corolla reddish purple or purplish, 2.3-2.7 cm, sparsely puberulent; tube straight, tubular, slender, gradually dilated at apex; upper lip slightly curved, lobes oblong; middle lobe of lower lip flabellate, apex emarginate, villous inside; lateral lobes oblong, ca. 1/2 as long as middle lobe. Stamens included. Nutlets globose-oblong, smooth, densely pubescent, adaxially slightly triquetrous, base small umbonate. Fl. Sep, fr. Oct.
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