Herbs with or without tubers. Stems erect or ascending, 30-60 cm, base purplish, leafless, unbranched. Petiole slender, to 8 cm; leaf blade ovate, sometimes circular in basal stem leaves, 6-8 × 3.5-4 cm, villous-pubescent, abaxially gray-green, margin irregularly coarse crenate-serrate. Verticillasters 2-20-flowered, subglobose, to 3(-4) cm in diam.; bracteoles ca. 2 mm, linear, ciliate. Pedicel short to obsolete. Calyx tubular, slightly curved, somewhat dilated toward apex, villous pubescent, 10-veined, throat and teeth strigose; teeth broadly triangular, subequal, apex acute. Corolla white or purple spotted on throat, 1.2-1.5 cm; tube 8-10 mm, straight, cylindric, slightly dilated at throat, much exserted, glabrous, villous annulate inside; limb white villous outside; upper lip oblong, erect, concave, margin entire. Ovary glabrous. Nutlets triquetrous, oblong, glabrous, apex truncate. Fl. Jun.
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