Stems single, 40-120 cm tall, up to 1 cm in diam., often ± zigzag-twisted, sometimes branched. Cauline leaves alternate; blade ovate or elliptic, 3-13 × 2-8.5 cm, base cordate, truncate, obtuse, or cuneate, margin serrate or doubly serrate, apex obtuse to shortly acuminate; petiole 1-6 cm, sometimes winged. Inflorescence branches mostly long and horizontally spreading, forming a large panicle, less frequently short, forming a narrow panicle. Hypanthium broadly obconic; calyx lobes elliptic or lanceolate 4-13 × 2-4 mm, margin entire (rarely ciliate). Corolla blue, blue-purple, or white, campanulate, 2-2.5 cm; lobes broadly elliptic, 5-7 mm wide, apex acute. Disk tubular, 2-3 mm. Style as long as corolla. Capsule ovoid-conical, ca. 7 × 5 mm. Seeds yellow-brown, black at both ends, narrowly oblong, slightly compressed, 0.8-1.5 mm. Fl. Jul-Aug, fr. Aug-Sep. 2n = 34*, 36*.
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A herb that keeps growing from year to year. It has a single stem 40-120 cm tall. The leaves on the stem are alternate and oval. They are 3-13 cm long by 2-9 cm wide. There are teeth along the edge. The flowers are blue, purple or white.
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