Stems often 2 to several from one root, erect, 25-80 cm tall, simple or branched above, glabrous, densely leafy at middle during anthesis but basal leaves withered. Leaves shortly petiolate; blade linear-elliptic or lanceolate, 4-10 × 0.5-1.2 cm, thickly papery, both surfaces glabrous, base attenuate into petiole, margin serrate or crenate. Inflorescence a panicle with long or short branches; pedicels up to 1 cm. Hypanthium obovoid or obconic, sometimes subglobose, glabrous; calyx lobes subulate or linear-lanceolate, 5-7 × ca. 1 mm, with 1 or 2 pairs of verrucose denticles. Corolla purple or blue-purple, funnelform-campanulate, 1.5-2 cm; lobes ovate-deltoid, ca. 1/2 as long as tube. Disk annular or shortly tubular, less than 1.2 mm, glabrous. Style 2-2.5 mm, ca. 5 mm longer than corolla. Capsule globose-ellipsoid, 7-8 × 4-5 mm. Fl. Aug-Oct, fr. Sep-Oct.
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