Herbs annual, glabrous. Stems tufted, ascending, 12(--20) cm tall, slender. Leaves sessile, linear to linear-lanceolate, 5--15 × (0.8--)1.5--2(--4) mm, both surfaces glabrous, midvein conspicuous, base rounded, apex obtuse. Flowers 2--4, in cymose umbel; bracts ovate, ca. 2 mm, membranous. Pedicel 1.2--2.4 cm, slender. Sepals 5, green, ovate-lanceolate, ca. 2 mm, 3-veined, margin broadly membranous, apex acute. Petals absent. Stamens 5; filaments slender. Styles 3, short. Capsule ovoid, ca. 4 mm, ca. 2 × as long as persistent sepals, 6-valved. Seeds pale brown or dark brown, compressed orbicular, with granular protuberances. Fl. Jun--Jul, fr. Jul--Aug.
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