Herbs perennial, (15--)20--50 cm. Roots robust, slightly lignified. Stems sparsely, rarely densely, caespitose, erect or ascending, simple, rarely 1-or 2-branched below, glabrous, rarely shortly pubescent. Basal leaves numerous, linear-oblanceolate, 6--18 cm × 2--5 mm, both surfaces glabrous, ciliate basally, base attenuate into petiole, apex acuminate at apex; cauline leaves linear-lanceolate, smaller than basal leaves, ciliate, base half clasping. Flowers in a racemiform thyrse; cymules opposite, 1-flowered (rarely more); peduncles very short. Pedicel nearly as long as calyx, glabrous; bracts ovate-lanceolate, 4--12 mm, ciliate, base connate, apex acuminate. Calyx narrowly campanulate, 8--15(--18) × 4 mm, glabrous, longitudinal veins violet, connate at apex; calyx teeth triangular-ovate, margin membranous, white, shortly ciliate, apex obtuse. Androgynophore ca. 2 mm, shortly hairy. Petal claws oblanceolate, glabrous, auricles triangular; limbs exserted beyond calyx, white, violet or pink below, bifid to middle or below, lobes narrowly rounded; coronal scales orbicular, small. Stamens and styles exserted; filaments glabrous. Styles 3. Capsule globose-ovoid, 6--8 mm. Seeds orbicular-reniform, ca. 1 mm. Fl. Jul--Aug, fr. Aug--Sep.
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