Herbs perennial, 40-70 cm. Stems many, branched, sparsely short pubescent. Petiole of basal leaves to 25 cm; leaf blade cordate, 5-10(-13) × 4-9 cm, sparsely short pubescent, base cordate, apex acuminate; lateral veins 5-9. Petiole of stem leaves shorter; leaf blade ovate to narrowly ovate, 4-10 × 2-5 cm. Inflorescences at apex of stems or branches, 2-parted, 5-9 cm; bracts emarginate. Pedicel thin, long, 3-7 mm, short pubescent. Calyx triangular-lanceolate to linear-lanceolate, 3-3.5(-4) mm. Fruiting calyx enlarged, 6-7 mm, short pubescent outside. Corolla blue to light purple, campanulate; tube 3-3.5(-4) mm, 7-9 mm in diam.; limb ± rounded; appendages trapeziform, 1.8-2.1 × 0.6-1 mm, with curly soft hairs. Anthers rounded or oblong, 1-3 mm. Style higher than nutlet. Nutlets 4-4.5 × ca. 2 mm; adaxially slightly tuberculate, with few glochids or sparse minute hairs; marginal glochids 2-3 mm; abaxially tuberculate. Fl. and fr. Jul-Aug.
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