Plants perennial. Roots thickened, carrot-shaped, sometimes lignified. Stems erect, purplish, cylindrical, 20-70 cm tall, multi-branched; branches upright, slender, white hirsute. Basal and lower cauline leaves 5-8 × 1-3 cm, white hirsute, with long winged petiole; blade oblong or elliptic, sparsely crenate; upper cauline leaves sessile, ± amplexicaul, linear-lanceolate, entire. Flowers pendent in narrow terminal panicles on main stems and branches; pedicels 2-8 mm, longer than linear bracts. Hypanthium glabrous, obconic; calyx lobes linear-subulate, 3-4 mm, nearly 1 mm wide at base, margin setose; reflexed appendices ovate-oblong or ovate-lanceolate, slightly shorter than hypanthium, margin setose. Corolla pale blue-purple, sometimes nearly white, narrowly campanulate, 9-12 mm, inside sparsely pubescent; lobes ovate-deltoid, 1/3-1/2 as long as tube. Style equal to or slightly shorter than corolla; stigma 3-fid. Capsule obconic, ca. 4 × 3 mm. Seeds elliptic, ca. 1 mm. Fl. May-Jul. 2n = 34.
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