Roots fleshy, up to 20 cm, up to 1.5 cm in diam., branched or not. Stems single, erect, more than 60 cm tall, simple or branched above, glabrous or very rarely sparsely hirsute toward base. Lower cauline leaves with petiole up to 4 cm; upper cauline leaves almost sessile; blade ovate, lanceolate, or elliptic from below toward apex, 3-12 × 1.4-5.5 cm, abaxially glabrous, adaxially sparsely puberulent, base cuneate or obtuse, margin serrate, apex acute to acuminate. Flowers glabrous except on filaments and style. Calyx tube globose or campanulate; lobes linear, 4-8 mm. Corolla purple-blue or blue-purple; lobes 8-14 mm. Style 9-15 mm. Capsule globose, base truncate or concave, ca. 5 mm in diam. Seeds yellow to brown, ovoid, ellipsoid, or oblong, ca. 1 mm. Fl. Jul-Aug, fr. Sep. 2n = 28.
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A herb that keeps growing from year to year. It grows 50 cm-1 m tall. It has underground stems or rhizomes. The roots are fleshy and 20 cm long by 1.5 cm thick. The leaves are narrowly oval. They are 5-12 cm long. There are irregular teeth along the edge. The flowers are blue to purple.
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