Reynoutria japonica seeds mature in Oct.虎杖 hu zhang. Thickets in valleys, field margins, mountain slopes; 100-2000 m. Anhui, Fujian, N Gansu, Guangdong, Guangxi, Guizhou, Hainan, ?Heilongjiang, Henan, Hubei, Hunan, Jiangsu, Jiangxi, ?Liaoning, N Shaanxi, Shandong, Sichuan, Taiwan, Yunnan, Zhejiang [Japan, Korea, Russia (Far East); widely cultivated and becoming a weed in other parts of the world].

Reynoutria japonica seeds

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  • 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*.