Polygonum macrophyllum D. Don

Flowering from July to August; fruiting from August to September.

Polygonum macrophyllum var. macrophyllum is close relative of Polygonum macrophyllum var. stenophyllum, but differs from the latter in its basal leaves oblong or lanceolate, 10-30 mm wide (vs. linear-lanceolate, 2-5 mm wide).

Polygonum macrophyllum is occurring in Guizhou, Hubei, Shaanxi, Sichuan, Xizang, Yunnan of China, Bhutan, N India, Nepal, Sikkim.

Herbs perennial. Rhizomes curved, large, 1-2 cm in diameter. Stems 2 or 3 from rhizome, erect, 8-30 cm tall, simple. Basal leaves petiolate; petiole 3-8 cm; leaf blade gray-green abaxially, green adaxially, oblong or lanceolate, 3-11 cm long, 1-3 cm wide, abaxially sometimes sparsely pubescent, adaxially glabrous, base subcordate or cuneate, margin with thickened vein tips, revolute, apex acute. Cauline leaves shortly petiolate or subsessile; leaf blade narrowly lanceolate or linear; ocrea: lower part green, upper part brown, tubular, membranous, apex oblique, dehiscent, not ciliate. Inflorescence terminal, shortly spicate, 1.5-2.5 cm, 1-1.5 cm in diameter; bracts ovate, 3-4 mm, membranous, apex acuminate, each 2-3-flowered. Pedicel 4-5 mm, slender. Perianth pinkish or white, 5-parted; tepals elliptic, 2.5-3 mm. Stamens 8, exserted; anthers black-purple. Styles 3, connate at base; stigmas capitate. Achenes included in persistent perianth, yellow-brown, shiny, ovoid, trigonous, 2.5-3 mm.

Growing in grassy slopes, alpine meadows; 2300-5000 m.