Herbs erect, rhizomatous, perennial, usually densely pilose throughout. Stems 30-60 cm, slender, branches few or none. Petiole 0.7-1.5 cm; leaf blade ovate-cordate, 3-5 × 2-3 cm, adaxially bullate, base cordate, margin crenate, apex acute. Verticillasters 2-6-flowered, widely spaced; floral leaves short petiolate or subsessile, triangular-oblong to ovate, base shallowly cordate to subrounded, apex acute; bracteoles few, linear, ca. 2 mm. Pedicel less than 1 mm. Calyx campanulate, ca. 7 mm, pilose, glandular, 10-veined, accessory veins inconspicuous; teeth subequal, ca. 3 mm, glandular puberulent outside, finely pilose inside. Corolla reddish, sparsely puberulent; tube ca. 9 mm, base saccate; upper lip straight, ovate, ca. 3.5 mm, margin entire; lower lip spreading, ca. 4 × 5 mm; middle lobe trapeziform, emarginate; lateral lobes ovate, ca. 1.5 mm wide. Stamens reaching middle of upper lip of corolla; filaments puberulent, apex slightly dilated. Ovary dark brown, glabrous. Style nearly included. Fl. Jun-Jul.
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