Stems single or several from one root, 20-100 cm tall, simple, glabrous or sparsely scaberulose. Basal leaves ovate-orbicular, base rounded. Cauline leaves petiolate, at least toward base; blade narrowly elliptic or narrowly lanceolate, 3-8 × 0.5-2 cm, both surfaces glabrous, base cuneate, margin serrate, apex obtuse to acuminate. Inflorescence branches often slender, forming a narrow panicle; pedicels slender, up to 3 cm. Hypanthium globose or obovoid, usually glabrous, less often sparsely scaberulose; calyx lobes linear-lanceolate, 5-7 × ca. 1 mm. Corolla purple or purple-blue, campanulate, 1.3-1.5 cm. Disk shortly cylindrical, 1-1.5 mm. Style 2-4 mm longer than corolla. Capsule broadly ellipsoid or globose, 6-7 × ca. 5 mm. Seeds brown-yellow, ellipsoid, ca. 1.8 mm. Fl. and fr. Aug-Oct.
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