Arenaria umbrosa Bunge in Ledebour, Fl. Altaic. 2: 173. 1830.

Herbs perennial. Stems caespitose, 5--18 cm tall, pubescent. Leaves sessile, oblong-lanceolate or lanceolate, 1--3 cm × 2--5 mm, pubescent, 1-veined, base attenuate, apex acute. Flower solitary, axillary or terminal. Pedicel 1.2--1.7 cm, slender, pubescent. Sepals ovate-lanceolate, 2--3 mm, hairy at base, apex acute. Petals oblong-obovate, ca. 2 × as long as sepals. Capsule 5--6 mm. Seeds brown, reniform, ca. 0.3 mm, slightly flat, strophiolate. Fl. Jun--Jul, fr. Jul--Aug.

Grasslands, woods, scrub; 1800--2700 m. Xinjiang [Kazakhstan, Russia].