Reynoutria sachalinensis (weed)

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Reynoutria sachalinensis (click on image to enlarge it)
Source: Wikimedia Commons

Reynoutria sachalinensis (weed) (F.Schmidt) Nakai - (giant knotweed)

This plant is native to eastern Asia and is closely related to Reynoutria japonica from the same region. Both species were introduced into Europe in the 1880s as ornamental and fodder plants. Similarly, they were introduced into North America.

R. japonica and R. sachalinensis spread around central and northern parts of Europe, becoming highly invasive, and eventually hybridised to the form Reynoutria × bohemica (Chrtek and Chrtková). The hybrid can be more invasive.

For details see the respective page in Wikipedia.

Vernacular names
• Deutsch: Riesenknöterich
• English: giant knotweed
Sakhalin knotweed
• Français: renouée géante

Fallopia sachalinensis
Polygonum sachalinense