Herbs perennial. Stems erect, to 1 m, densely retrorse puberulent, purplish, nodes slightly thickened. Petiole 1.5-3 cm; leaf blade broadly ovate to oblate-ovate, thin papery, adaxially sparsely minutely hispid, densely pubescent on veins, abaxially sometimes purplish red, densely puberulent, sparsely yellowish glandular, base abruptly attenuate-decurrent, margin crenate-serrate, apex rounded to acuminate, apical tooth lanceolate, lateral veins 3-or 4-paired. Racemes terminal and axillary, in a panicles to 20 cm, densely glandular pubescent; cymes pedunculate, widely spaced, 1-3-flowered; lower floral leaves subsessile, small; bracts ovate to linear. Calyx broadly campanulate, to 4.5 × 4 mm, densely pubescent, glandular, conspicuously 2-lipped; teeth triangular, apex acute, upper teeth ca. 2 mm, narrow, lower ca. 2.5 mm; fruiting calyx dilated to 6 mm. Corolla reddish purple or white, ca. 7.5 mm, sparsely puberulent, glandular, tube ca. 4 mm, lower lip longer than upper. Stamens included. Style included. Nutlets yellowish brown, ovoid, ca. 1.2 mm, glabrous. Fl. and fr. Aug-Sep.
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