Stems 60-120 cm tall, simple, glabrous or sparsely white hispidulous. Cauline leaves usually long petiolate, very rarely almost sessile; blade ovate, 3-15 × 2-5 cm, abaxially glabrous or hispidulous along veins, adaxially sparsely puberulent or glabrous, base broadly cuneate or subtruncate, margin serrate, apex acute to acuminate; petiole winged, up to 8 cm. Inflorescence branches long and horizontally spreading, forming a large panicle, or extremely short, with only 2 or 3 flowers or even a single flower, and thus forming an extremely narrow panicle or even a pseudoraceme; inflorescence rachises and all floral parts glabrous, scaberulose, or puberulent. Hypanthium obconic or obovoid; calyx lobes ovate, ovate-lanceolate, or linear-lanceolate, 4-9 × 1.5-4 mm, overlapping at base or not. Corolla blue, pale blue, purple, or white, campanulate, 15-27 mm; lobes ovate-deltoid, 4-11 × 7-9 mm. Disk shortly tubular, (0.5-)1-2.5 mm, glabrous or hairy at apex. Style nearly as long as corolla. Capsule ovoid-ellipsoid or obovoid, 5-8 × 4-6 mm. Seeds yellow-brown, oblong, slightly compressed, 1-1.5 mm, 1-ribbed. Fl. Jul-Sep, fr. Sep-Oct. 2n = 34*, 34+1B*.
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