Description from Flora of China
Arenaria yunnanensis Franchet var. trichophora (Franchet) F. N. Williams.
Herbs perennial. Roots conic or spinose. Stems clustered, simple or branched at base, prostrate or erect, 10--30 cm, long hard hispid and glandular pubescent. Proximal cauline leaves sessile; middle and distal cauline leaves shortly petiolate; leaf blade green abaxially, ovate or orbicular-elliptic, 0.8--2 cm × 3--10 mm, thick, midvein raised, base narrowed, apex obtuse. Cymes few to many flowered; bracts leaflike, very small. Pedicel 0.8--2 cm, densely stiffly hairy and glandular pubescent, hairs erect or recurved. Sepals 5, lanceolate, 5--6 mm, glandular pubescent abaxially, base broadened, margin white membranous, apex acute. Petals 5, white, obovate, ca. 2 × as long as sepals, apex fimbriate. Stamens 10; anthers black or yellow-brown, globose. Ovary ovoid; ovules numerous. Styles 2. Fl. Jul--Sep.
* Alpine scrub, grasslands, shifting screes, sands; 2500--4700 m. SW Sichuan, SE Xizang, N Yunnan.