Stems single, 40-100 cm tall, glabrous, usually simple. Cauline leaves long petiolate; blade typically ovate to ovate-lanceolate, rarely ovate-orbicular, 5-13 × 2-7 cm, membranous, glabrous, base mostly truncate, rounded, or obtuse, rarely cordate, margin serrate or doubly serrate, apex usually acuminate; petiole up to 3 cm. Flowers often solitary on pedicels, less frequently in several-flowered cymes, forming a pseudoraceme or narrow panicle. Hypanthium obovoid or obovoid-obconic, glabrous; calyx lobes lanceolate, 7-12 × 1.5-2 mm, margin entire. Corolla blue, campanulate, 2-3.5 cm; lobes 7-12 mm. Disk cylindrical, 2.5-3 mm, ca. 1 mm in diam. Capsule obovoid, 5-8 × 4-7 mm. Seeds narrowly oblong, slightly curved, ca. 1 mm. Fl. Jul-Aug, fr. Aug-Sep. 2n = 34, 36.
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A herb that keeps growing from year to year. It grows 1 m high. The leaves on the stem have leaf stalks. The leaves are oval and 5-13 cm long by 2-7 cm wide. The flowers are blue.