Stems 1-3 from a single root, erect, 35-105 cm tall, simple, densely retrorsely hirsute. Basal leaves long petiolate; blade ovate, base cordate. Cauline leaves sessile; blade narrowly ovate, lanceolate, or elliptic, 4-8 × 0.5-2.5 cm, abaxially densely retrorsely hirsute, adaxially glabrous or hispidulous along veins, margin serrate. Cymes with 1-5 flowers, in a narrow panicle or pseudoraceme; pedicels ca. 3 mm. Hypanthium ellipsoid, glabrous or hispidulous; calyx lobes narrowly lanceolate, 5-6 × 0.7-1.5 mm, margin entire or with 1 or 2 sometimes verrucose denticles. Corolla blue or blue-purple, campanulate, 1.2-2.1 cm; lobes broadly ovate-deltoid. Disk shortly tubular, 0.4-1.4 mm. Style as long as corolla. Capsule ellipsoid, 6-10 × 4-5.5 mm. Seeds brown-red, ellipsoid, slightly compressed, 1.4-1.9 mm. Fl. Jul-Aug, fr. Sep. 2n = 68*.
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