Herbs erect. Stem solitary, to 1 m, retrorse puberulent, base to 4 mm in diam., leafless, unbranched. Petiole 1.5-4 cm, narrowly winged; leaf blade ovate, 6.5-11 × 4-6.5 cm, sparsely pubescent, glandular, base broadly cuneate, abruptly decurrent, margin crenate-serrate, apex acute to acuminate. Verticillasters 10-14-flowered, globose, ca. 3 cm in diam.; bracteoles subulate, ca. 0.5 mm, deciduous. Pedicel obsolete. Calyx obconical, ca. 5 mm, sparsely pubescent, glabrous except for puberulent teeth inside, conspicuously 5-veined; teeth subequal, broadly triangular, ca. 1 mm, apex acute. Corolla white, ca. 1.5 cm, sparsely puberulent, glandular, pilose annulate inside; tube ca. 9 mm, throat ca. 3 mm wide; upper lip oblong, margin entire; middle lobe of lower lip ovate, lateral lobes oblong. Nutlets brown, triquetrous, oblong, ca. 2.2 × 1.3 mm, base attenuate, apex truncate, sparsely pubescent.
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