Herbs perennial, glabrous. Stems tufted, erect or ascending, quadrangular, 30--50 cm tall, slender, apically branched. Leaves linear, 2--3 cm × 1--2(--3) mm, marginally sparsely ciliate, midvein abaxially raised, adaxially retuse, base cuneate, slightly clasping, apex acuminate. Flowers solitary or in axillary cymes; bracts lanceolate, 1--2 mm, margin membranous, sometimes herbaceous below, apex acuminate. Pedicel filiform, 2--5 cm. Sepals 5, lanceolate to narrowly lanceolate, 4--5 mm, midvein conspicuous, margin membranous. Petals 5, linear-lanceolate, ca. 1.5 × as long as sepals, 2-cleft nearly to base; lobes linear. Stamens 10, shorter than sepals. Styles 3. Capsule yellow, cylindric-ovoid, as long as to 1.5 × as long as persistent sepals, 6-valved. Seeds numerous, brown, ellipsoid, 0.7--1 mm, regularly rugulose. Fl. May--Jul, fr. Jun--Aug.
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