Polygonum sparsipilosum A. J. Li

Herbs annual. Stems ascending or decumbent, 10-30 cm tall, slender, angulate, branched, pilose or glabrous. Petiole 4-8 mm; leaf blade broadly ovate, 1-1.5 × 0.8-1 cm, papery, both surfaces pilose, base broadly cuneate or subtruncate, margin ciliate, apex obtuse; ocrea tubular, dehiscent, base densely pubescent. Inflorescence terminal or axillary, capitate; bracts ovate, membranous, each 1-flowered. Pedicel short. Perianth white or greenish, 4-parted, with glandular dots or not; tepals broadly elliptic, ca. 2 mm, unequal. Fertile stamens 2-8; anthers yellow. Styles 3, very short; stigmas capitate. Achenes included in persistent perianth, yellow-brown, slightly shiny, ovoid, trigonous, ca. 2 mm. Fl. Jun-Jul, fr. Aug-Sep.

Gansu, ?Nei Mongol, Qinghai, Shaanxi, Sichuan, Xizang.

* Grassy slopes, wet valleys; 2300-4300 m.