Herbs perennial, 25--40 cm tall. Roots robust, lignified, multicrowned. Stems clustered, erect, slender, basally retrorsely hairy. Basal leaves withered at anthesis; cauline leaves with prominent, sterile axillary branches, linear-oblanceolate or lanceolate-linear, 2--4 cm × 3--6 mm, shortly villous at midvein, margin shortly ciliate, base attenuate, apex acuminate. Flowers in a thyrse; cymules 1-to several flowered. Pedicel 4--6 mm, slender, viscid; bracts lanceolate-linear, basal margin membranous, ciliate. Calyx ovoid-campanulate, 6--8 mm. Androgynophore 2--2.5 mm, sparsely hairy. Petal claws oblanceolate, glabrous; limbs white, deeply bifid to middle or more; lobes linear, apex obtuse; coronal scales minute. Stamens and styles conspicuously exserted; filaments glabrous. Styles 3. Capsule globose-ovoid, 5--7 × 2.5--3 mm. Seeds grayish brown, reniform, ca. 1 mm. Fl. Jul--Aug, fr. Aug.
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