Herbs annual or biennial. Stems erect, to 1.2 m, villous, sometimes glandular villous. Petiole 1-9 cm; leaf blade triangular to ovate-triangular, 3-16 × 2.3-16 cm, adaxially pubescent or minutely hispid, abaxially sparsely yellow-brown glandular, villous on veins, base cordate to subtruncate, basal lobes ovate, apex acute to obtuse, margin double crenate or dentate, apex acuminate to caudate-acuminate. Inflorescences villous, glandular pubescent; verticillasters 2-flowered, widely spaced, in terminal and axillary racemes; upper bracts lanceolate, 3-6 × 1-3 mm. Pedicel ca. 2 mm. Calyx campanulate, 7-10 mm, slightly dilated after anthesis, villous, 2-lipped to ca. 1/3 its length; upper lip ca. 3 × 6 mm, apex 3-mucronate; lower lip somewhat larger than upper, teeth obliquely triangular, apex acute. Corolla blue-purple or purple, 2.3-2.8 cm, slightly pubescent; tube imperfectly pilose annulate inside, narrow, cylindric toward base, exserted part abruptly dilated, curved upward, to 7 mm wide at throat; upper lip oblong-obcordate, 8 × 6-7 mm; lower lip ca. 7 × to 12 mm; lateral lobes lunate, ca. 3 mm wide. Filaments ca. 5 mm, glabrous; connectives ca. 7.5 mm, arcuate, upper arms ca. 4 mm, lower arms ca. 3.5 mm. Style as long as upper corolla lip to exserted. Nutlets ellipsoid. Fl. Aug-Oct.
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