Plants perennial, 50-65 cm tall. Roots carrot-shaped, 5-15 mm in diam. Stems simple, sparsely hirsute. Basal and lower cauline leaves with petiole 5-12 cm; upper cauline leaves shortly petiolate to sessile, blade adaxially green, ovate-triangular or ovate-lanceolate, 2.5-3.5 × 1.2-1.8 cm, abaxially sparsely strigose or hispidulous, base subtruncate or cuneate, margin irregularly serrate, apex acuminate or acute. Panicles terminal, narrow, inflorescence branches reduced and sometimes with solitary flowers; bracts linear, strigose; pedicels slender, 5-15 mm, sparsely strigose. Hypanthium obovoid or obconic, sparsely strigose; calyx lobes lanceolate or linear-lanceolate, 5-8 × 1-1.8 mm, outside strigose, apex acuminate or acute. Corolla blue-purple or pale blue, campanulate, 1.5-2.3 cm, outside glabrous, inside white villous; lobes ovate-triangular, 6-8 × ca. 5 mm. Filaments white, base dilated; anthers linear. Style included; stigma 2-or 3-fid. Capsule subglobose, 3-5 mm. Seeds oblong or ovate-oblong, slightly compressed, ca. 1 mm. Fl. Jun-Jul, fr. Jul-Sep.
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