Root to 1 cm in diam. Caudexes sometimes with horizontal branches. Stems (1 or)2 to several, leafy mostly in lower half, sparsely villous or rarely glabrous. Cauline leaves sessile or shortly winged-petiolate; blade ovate-orbicular, elliptic, lanceolate, or linear-lanceolate, 2-8 × 0.2-1.8 cm, both surfaces usually puberulent or rarely glabrous, base cuneate or attenuate, margin entire, crenulate, or serrate, apex acute or acuminate. Flowers terminal and solitary, or several in a pseudoraceme; pedicels short. Hypanthium obconic, base acute or sometimes obtuse, glabrous; calyx lobes narrowly triangular, 5-10 × 1.5-1.7 mm, margin with several verrucose denticles and sometimes sparsely ciliate. Corolla blue or purple-blue, bowl-shaped, 1.3-2.2 cm; lobes deltoid-orbicular, 1/2-2/3 as long as tube. Disk annular, 0.5-1 mm high. Style 13-15 mm, shorter or sometimes longer than corolla. Capsule ellipsoid, 8-11 × 5-6.5 mm. Seeds yellow-brown, ca. 1 mm. Fl. Jul-Sep, fr. Sep. 2n = 34*.
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