Roots carrot-shaped, up to 2.5 cm in diam. Stems simple, 30-100 cm tall, glabrous, rarely white pubescent. Cauline leaves sessile; blade ovate-lanceolate, 2.5-7 × 0.5-3 cm, both surfaces glabrous, sometimes hispidulous abaxially, base cuneate, margin serrate, apex acute or acuminate. Flowers several in a pseudoraceme or inflorescences with short branches of 2-4 flowers, forming a narrow panicle; pedicels less than 1 cm. Hypanthium obovoid or obconic, glabrous; calyx lobes linear-lanceolate or subulate, 3-5 × 1-1.2 mm, widest at base or at lower part, margin usually entire. Corolla blue, funnelform-campanulate, 1.5-2.2 cm; lobes ovate, ca. 1/2 as long as tube, apex acute. Disk shortly tubular, 1-2.5 mm, glabrous. Style nearly as long as or slightly longer than corolla. Fl. Jul-Aug. 2n = 34, 102.
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