Stems often single, 30-100 cm tall, simple, usually densely, less often sparsely retrorsely hispidulous, very rarely subglabrous. Cauline leaves sessile or shortly petiolate; blade obovate, ovate-elliptic, or oblong (occasionally linear-elliptic or linear), 2-7 × 0.5-4 cm, both surfaces hispidulous, base obtuse or cuneate, margin with 2 to several large teeth, apex obtuse, acute, or shortly acuminate. Inflorescences usually with branches at base, forming a panicle, sometimes with only several flowers glomerate into a pseudoraceme; pedicels less than 1 cm. Hypanthium obovoid or globose-obovoid, glabrous, base rounded or ± obtuse; calyx lobes triangular-subulate, 3-9 mm, margin with 1 or 2 pairs of long denticles. Corolla purple, blue, or blue-purple, rarely white, campanulate, 1.5-2.5 cm; lobes ovate-deltoid, 5-8 mm. Disk tubular, 2-2.6(-3) mm, hairy at least at apex. Style nearly as long as or slightly longer than corolla. Capsule globose-ellipsoid or ellipsoid, 7-11 × 4-6 mm. Seeds brown-yellow, ellipsoid, ca. 1.4 mm, 1-ribbed. Fl. Jul-Oct, fr. Oct-Nov. 2n = 34*, 102*.
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A herb. It keeps growing from year to year. The stems are 30-100 cm tall. They have hairs. The leaves on the stems do not have leaf stalks and are 2-7 cm long by 1-4 cm wide. The flowers are purple or blue.
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