Herbs annual. Stems erect, 20-43 cm, densely white hirsute, unbranched or few branched. Leaves mostly basal, simple or ternate compound; petiole 1.5-6 cm; leaf blades of simple leaves oblong to ovate-lanceolate, 2.5-7.5 × 1.3-4.5 cm, adaxially hirsute, abaxially glabrous, hirsute on veins, base rounded to cordate, margin coarsely crenate; terminal leaflet ovate-elliptic, to 9 cm × 5 mm, lateral leaflets ovate. Verticillasters 6-14-flowered, widely spaced, in racemes or panicles; bracts lanceolate, to 2 mm. Pedicel 1-2 mm, curved downward, densely pubescent. Calyx campanulate, purplish, ca. 4 mm, glandular pilose, throat hirsute annulate; upper lip triangular, less than ca. 1 × 2 mm; lower lip ca. 1 × 3 mm, teeth triangular, apex acute. Corolla violet, slightly puberulent; tube imperfectly fine pilose annulate inside, cylindric, ca. 5.5 mm; upper lip oblong, ca. 4.5 × 2.1 mm; middle lobe of lower lip ca. 2 × to 6 mm, undulate; lateral lobes ovate, 1-1.5 mm wide. Filaments ca. 3 mm; connectives ca. 5 mm, upper arms ca. 3.5 mm, slightly curved, lower arms short, apex united. Style exserted, ca. 1.3 cm. Nutlets brownish, ellipsoid, ca. 1.3 × 0.7 mm. Fl. Jun-Aug.
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