Stems single or several from one root, 20-100 cm tall, often simple, glabrous or hispidulous. Basal leaves reniform, base cordate, margin irregularly serrate. Cauline leaves sessile; blade ovate, lanceolate, or elliptic, occasionally linear-lanceolate, 2-10 × 0.5-2.5 cm, glabrous or hispidulous, margin serrate with teeth distant. Cymes with solitary flowers forming a pseudoraceme, or in a narrow panicle with short inflorescence branches; pedicels usually less than 1 cm. Hypanthium obconic, usually pubescent, rarely glabrous; calyx lobes triangular-lanceolate, 3.5-7 × 1-2 mm, margin entire. Corolla purple or dark blue, campanulate, slightly constricted at throat, 1.4-2.2 cm; lobes often reflexed, short, up to 1/4 as long as whole corolla. Disk tubular, (2-)2.5-4 mm, often sparsely puberulent. Style usually slightly exserted or sometimes as long as corolla. Capsule ovoid-ellipsoid, 5-12 × 4-7 mm. Seeds yellow-brown, ovoid-ellipsoid, slightly compressed, ca. 1.2 mm. Fl. Aug-Oct. 2n = 34, 68.
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A herb. It keeps growing from year to year. The stems are 20-100 cm tall. The leaves at the base are kidney shaped. The leaves on the stem are without stalks and narrowly sword shaped. They are 2-10 cm long by 1-3 cm wide. There are teeth along the edge. The flowers are purple or dark blue.
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