Herbs perennial, 50--90 cm tall. Roots robust, lignified, multicrowned. Stems solitary or clustered, erect, simple or sparsely branched above, basally retrorsely pubescent, apically glabrescent. Basal leaves withered at anthesis; cauline leaves with prominent, sterile axillary branches, narrowly lanceolate, 4--9 cm × 5--13 mm, both surfaces glabrous, margin ciliate, midvein prominent, base cuneate, apex acuminate. Flowers in a thyrse; cymules 1-to several flowered. Pedicel 4--8 mm, slender, glabrous; bracts lanceolate-linear, margin membranous, ciliate. Calyx sometimes pale violet, broadly campanulate, 4--6 mm, glabrous. Androgynophore 1--1.5 mm, shortly hairy. Petal claws glabrous, auricles not obvious; limbs white, bifid to 1/3 to 1/2 of petals; lobes obtuse; coronal scales minute. Stamens and styles conspicuously exserted; filaments glabrous. Styles 3. Capsule ovoid, 5.5--6.5 mm, shorter than calyx. Seeds dark brown, reniform, ca. 1 mm. Fl. Jul--Aug, fr. Aug--Sep.
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