Distribution
Austria (introduced), Belgium (introduced), Bulgaria (introduced), Canada (introduced), China, Czech Republic (introduced), Finland (introduced), France (introduced), Georgia (introduced), Germany (introduced), Hungary (introduced), Ireland (introduced), Italy (introduced), Japan, Netherlands (introduced), New Zealand (introduced), North Korea, Norway (introduced), Poland (introduced), Portugal (introduced), Romania (introduced), Russian Federation, Slovakia (introduced), South Korea, Spain (introduced), Sweden (introduced), Switzerland (introduced), Taiwan, Ukraine (introduced), United Kingdom of Great Britain and Northern Ireland (introduced), United States of America (introduced), Vietnam (introduced)

Herbs perennial. Rhizomes thickened. Stems numerous, erect, 1-2 m tall, stout, branched above, striate, papillate, often with red or purple spots. Leaves often deciduous; petiole 1-2 cm, papillate; leaf blade ovate or broadly elliptic, 5-12 × 4-9 cm, subleathery, both surfaces glabrous, papillate along veins, base broadly cuneate, rounded, or truncate, margin entire, apex acute or shortly acuminate, not ciliate. Inflorescence axillary, paniculate, 3-8 cm; bracts funnel-shaped, 1-2 mm, oblique, each 2-4-flowered. Pedicels 3-4 mm, slender, articulate below middle. Perianth white or greenish, 5-parted. Male flowers: stamens 8, longer than perianth. Female flowers: 3 outer tepals accrescent and winged on abaxial surface; styles 3; stigmas fimbriate. Achenes included in persistent perianth, black-brown, shiny, ovoid-ellipsoid, 4-5 mm. Fl. Jun-Sep, fr. Jul-Oct. 2n = 44, 52*.