Root carrotlike, 8-18 × 1.4-2.4 cm. Stems single, 20-120 cm tall, simple, glabrous or sometimes puberulent. Cauline leaves very rarely opposite, sessile or lower leaves sometimes with short winged petiole; blade broadly elliptic, elliptic, narrowly elliptic, lanceolate, or oblanceolate, 2-8 × 0.5-2.5 cm, glabrous, base rounded, obtuse, or cuneate, margin crenate or serrate, apex acute or less often acuminate. Flowers usually several in a pseudoraceme, sometimes solitary and terminal, or very rarely with short branches, forming a narrow panicle; pedicels usually less than 1 cm. Hypanthium narrowly obovoid or obconic, glabrous; calyx lobes narrowly triangular, 5-10 × 1-1.5 mm, margin with 1 or 2 pairs of denticles or entire. Corolla blue or purple-blue, narrowly campanulate or tubular-campanulate, less often campanulate, 2-3.5 cm; lobes deltoid, 5-10 mm. Disk tubular, 1.6-2.8 mm, glabrous. Style shorter than corolla. Capsule ellipsoid or oblong, 10-14 × 5-7 mm. Seeds yellow-brown, ellipsoid, ca. 1.5 mm. Fl. Jul-Sep, fr. Sep. 2n = 68*.
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