Stems often single, 30-100 cm tall, simple, usually hirsute, less often glabrous. Basal leaves long petiolate; blade ovate, base cordate, margin coarsely serrate. Cauline leaves sessile; blade ovate, lanceolate, elliptic, or linear, 2-11 × 0.4-3 cm, abaxially hispidulous but hirsute along major veins (or less often glabrous throughout), adaxially glabrous or hispidulous, base cuneate or attenuate, margin entire or sparsely serrate, apex acuminate. Inflorescence a narrow panicle with short branches, sometimes only several flowers in a pseudoraceme. Hypanthium ellipsoid, glabrous; calyx lobes narrowly triangular, 2-6 × 0.6-1 mm, margin entire or very rarely with verrucose denticles. Corolla blue, purple-blue, or pale purple, rarely white, subtubular or tubular-campanulate, 8-12 mm. Disk narrowly tubular, 3-6.5 mm, usually glabrous. Style 1.5-2 cm, remarkably exserted. Capsule ovoid or ellipsoid, 6-9 × 3-4 mm. Seeds brownish yellow, ellipsoid, 1.2-1.5 mm, finely striate, 1-ribbed. Fl. Jul-Sep, fr. Sep-Oct.
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