Stems numerous from one root, 25-50 cm tall, often with slender branches, densely hispidulous or glabrous. Basal leaf blade ovate-orbicular, base rounded. Cauline leaves sessile; blade needlelike to linear-oblong, up to 6 × 0.5 cm, glabrous or hispidulous, margin entire or sparsely serrate. Inflorescence branches slender, erect, forming a narrow panicle, rarely only several flowers in a pseudoraceme; pedicels slender. Hypanthium obovoid-oblong, glabrous; calyx lobes subulate, 3-4 mm, margin entire or with 1 or 2 pairs of verrucose denticles. Corolla blue or purple-blue, campanulate, 8-13 mm; lobes ovate-triangular, 3-3.5 mm. Disk tubular, 1-1.5 mm, glabrous or sparsely puberulent. Style slightly shorter than corolla. Capsule ellipsoid, 4-8 × 2.3-5 mm. Seeds brown-yellow, ellipsoid, slightly compressed, ca. 1 mm. Fl. Jul-Sep, fr. Sep. 2n = 34*.
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