Root carrot-shaped, 6-9 × 1.5-1.9 cm. Stems single, up to 1 m, simple, glabrous, less often retrorsely hispidulous. Cauline leaves (all or some) 3-5-verticillate or-subverticillate, rarely all alternate or nearly so, sessile or shortly petiolate; blade elliptic, ovate, lanceolate, or narrowly lanceolate, 3.5-16 × 0.6-4.2 cm, both surfaces glabrous, base cuneate or obtuse, margin coarsely serrate, apex acute or acuminate. Inflorescence pyramidal, with cymes alternate, short, and suberect, or flowers sometimes relatively few, forming a pseudoraceme. Hypanthium obovoid, obconic, or ellipsoid, glabrous or verrucose; calyx lobes lanceolate or narrowly triangular, 3-6 × 0.8-2 mm. Corolla blue-purple or blue, funnelform-campanulate, 1.3-2 cm; lobes deltoid or depressed triangular, 3-8 × 6-7.5 mm. Disk annular to shortly tubular, 0.5-1.5 mm. Style 1.5-2.4 cm, ± exserted. Capsule obovoid, ellipsoid, or subglobose, 6-8 × 4-5 mm. Seeds dark brown, glossy, ellipsoid, slightly compressed, 1.8-2 mm, smooth. Fl. Jul-Aug, fr. Aug-Sep. 2n = 34, 68, 72.
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A herb. It keeps growing from year to year. The roots are carrot shaped and 6-9 cm long by 2 cm wide. The stem is single and 2 m tall. The leaves on the stem are in rings of 3-5. They do not have leaf stalks and are 4-16 cm long by 6-8 cm wide. The flowers are in pyramid shaped groups. They are funnel shaped and blue.
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