Herbs perennial, 30--50 cm tall, glabrous. Stems caespitose, distally branched, straight, slender. Leaves linear, 1--3 cm × ca. 1 mm, subfleshy, base connate into a short sheath, apex usually acutely conduplicate carinate, cartilaginous. Cymes terminal, dense; bracts triangular, ca. 1.5 mm, margin white scarious, ciliolate, apex acuminate. Pedicel purplish, 2--3(--10) mm. Calyx white membranous between 5 green or deep purple veins, narrowly campanulate, 2--3 mm, lobed for ca. 1/3 its length; lobes ovate, apex acuminate. Petals white, triangular-cuneate, 2.5--3 × as long as calyx, apex retuse. Stamens unequal, shorter than petals; anthers yellowish brown, globose. Ovary ovoid. Styles equaling petals. Capsule slightly longer than calyx. Seeds reniform-globose, ca. 1 mm, tuberculate. Fl. Jul--Aug, fr. Aug--Sep.
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