Herbs perennial. Stems densely tufted, quadrangular, 5--15 cm tall, slender, branched, pubescent with retrorse hairs; sterile axillary branches present. Leaves linear or lanceolate-linear, 0.5--2 cm × 1--2.5 mm, midvein abaxially raised, base narrowed, margin ciliate, apex acuminate. Flowers 1--3, in terminal cymes; bracts ovate-lanceolate, 1.5--3 mm, margin broadly membranous. Pedicel 0.7--1.5 cm, slender, glabrous. Sepals 5, ovate-lanceolate, ca. 3 × 1.2 mm, glabrous, midvein conspicuous, margin membranous, apex acuminate. Petals 5, ca. 2 mm, ca. 2/3 as long as sepals, 2-cleft nearly to base; lobes oblong-linear, base narrowed, apex obtuse. Stamens 10, slightly longer than petals. Styles 3, ca. 1 mm. Capsule cylindric-ovoid, ca. 4 mm, ca. 1.25 × as long as persistent sepals. Seeds numerous, broadly ovoid or suborbicular, slightly compressed, 0.5--0.8 mm, nearly smooth. Fl. Jul, fr. Aug.
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