Stems several from one root, erect, 30-50 cm tall, simple, glabrous or less often scaberulose. Basal leaves cordate or obovate; cauline leaves alternate, sessile or with petiole extremely short and cuneate; blade usually lanceolate, less often ovate-lanceolate or linear, 2-5 × 0.2-1.8 cm, both surfaces glabrous, margin dentate or irregularly serrate. Flowers several in a pseudoraceme, or numerous in a large panicle due to having long inflorescence branches; pedicels slender, 0.5-1.5 cm. Calyx glabrous; tube obovoid or obovoid-conical; lobes subulate or subulate-lanceolate, 2-6 × ca. 1 mm, margin mostly with 1 pair of verrucose denticles, very rarely entire. Corolla blue or blue-purple, narrowly campanulate, 1.4-1.6 cm; lobes ovate-deltoid, ca. 3.5 mm. Disk tubular, 2-2.5 mm, glabrous. Style 1.6-1.8 cm, slightly longer than corolla. Capsule narrowly ellipsoid, ca. 8 × 3 mm. Seeds yellow, ellipsoid, ca. 2 mm. Fl. Jul-Aug, fr. Sep.
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