Herbs perennial, 30--40 cm tall, rhizomatous. Stems sparsely clustered, ascending, simple, sparsely villous. Leaves elliptic-lanceolate or oblanceolate, 5--8 cm × 8--12 mm, both surfaces glabrous, margin sparsely ciliate, 3-veined at base, midvein prominent, base cuneate, apex acuminate. Cymes racemiform. Pedicel 2--3 cm, slender, densely pubescent; bracts lanceolate or linear-lanceolate, densely pubescent, margin ciliate. Calyx campanulate, 1.5--1.8 cm × 6--8 mm, densely villous, sparsely glandular hairy; longitudinal veins violet, veins usually reticulate. Calyx teeth triangular-ovate, 3--4 mm, margin membranous, ciliate. Androgynophore ca. 3 mm, villous. Petals violet, ca. 2 cm; claws pale yellowish green, cuneate, ca. 1.2 cm, glabrous at base, auricles orbicular; limbs exserted beyond calyx, deeply 4-lobed; medial lobes round, shallowly 2-lobed or laciniate; lateral lobes linear, small; coronal scales broad, nearly flabellate, ca. 2 mm, with small irregular teeth. Stamens slightly exserted, 1--1.3 cm; filaments glabrous. Styles (4 or)5, included or slightly exserted. Capsule ellipsoid, 1--1.2 cm, shorter than calyx, usually 5-toothed. Seeds brown, reniform, ca. 1 mm, with prominent tubercles. Fl. Aug, fr. Aug--Sep.
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