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Polygonum polystachyum

Description from Flora of China

Subshrubs. Stems 80-100 cm, much branched, angulate, pubescent, sometimes glabrous. Petiole large, ca. 1 cm; leaf blade gray-green abaxially, green adaxially, broadly lanceolate, oblong-lanceolate, or lanceolate, 6-17 × 3-7 cm, abaxially densely pubescent, adaxially sparsely pubescent, base hastate-cordate or subtruncate, apex acuminate; ocrea lax, dark brown, tubular, oblique, 3-4 cm, membranous, densely pubescent, not ciliate. Inflorescence terminal, paniculate, spreading; rachis and branches pubescent. Perianth white or pinkish, 5-parted, ca. 4 mm in diam.; tepals unequal; outer 2 tepals small; inner 3 tepals broadly obovate, large, ca. 3 mm; bracts ovate, membranous, pubescent, apex acute. Pedicels longer than bracts, slender, glabrous or sparsely pubescent, apex articulate. Stamens 8, included; anthers purple. Styles 3, free; stigmas capitate. Achenes included in persistent perianth, brown, ovoid, trigonous, ca. 2.5 mm, smooth. Fl. Aug-Sep, fr. Sep-Oct.

Forests, valleys; 2200-4500 m. Sichuan, Xizang, Yunnan [Afghanistan, Bhutan, India, Kashmir, Myanmar, Nepal, Pakistan, Sikkim].


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