Arenaria trinervia Linnaeus, Sp. Pl. 1: 423. 1753; Stellaria anhweiensis Migo.

Herbs annual. Stems erect or ascending, 10--40 cm tall, pubescent, branched at base. Proximal leaves petiolate, distal leaves subsessile; leaf blade ovate to broadly ovate, 1--2.5 cm × 5--2 mm, 3-veined, both surfaces pilose, ciliate, base cuneate, apex acute. Flowers solitary and axillary or in terminal or axillary cymes. Pedicel 5--25 mm, slender, pubescent. Sepals 4 or 5, lanceolate, 3--4(--5) mm, with rigid hairs, 1-veined, margin broad, scarious, apex acuminate. Petals 4 or 5, sometimes reduced, obovate-oblong, 1/3--1/2 as long as sepals. Stamens 8--10, shorter than petals. Capsule 2.5--3 mm, teeth reflexed at apex. Seeds black, globose, shiny, with small laciniate strophiole. Fl. May--Jun, fr. Jun--Jul. 2n = 24.

Shaded forests, mountain slopes, forest margins, meadows; 1400--2400 m. Anhui, Gansu, Hubei, Hunan, Jiangxi, Shaanxi, Sichuan, Taiwan, Xinjiang, Zhejiang [Japan, Kazakhstan, Russia; SW Asia, Europe].