Synonym: Fallopia japonica; Polygonum reynoutria; Pleuropterus zuccarinii; Polygonum cuspidatum.
English: Asian knotweed; Japanese knotweed.
Geman: Japanischer Staudenknöterich.
Region: East Asia in Japan, China, Korea.
Culture: a pest and invasive species in North America and Europe.
Botany: perennial herb; stem hollow, with distinct raised nodes, appearing like bamboo, to 3 m high; leaves broad, oval, with a truncated base, ± 10 cm long, ± 10 cm broad, with an entire margin; flowers small, cream or white, in erect racemes ± 10 cm long in late summer and early autumn.