Fallopia japonica (Houtt.) Ronse Decr.
- Japanse duizendknoop
Polygonum cuspidatum Siebold & Zucc.
Reynoutria japonica Houtt.
Fallopia japonica is native to eastern Asia. Around 1850 it was introduced by Von Siebold through Leiden into the rest of Europe and is now common in many countries. The shrub can be present in large numbers and can therefore have a huge impact on the ecosystem.
Distribution in the Netherlands, 1975-2008. Source: Florbase 2N.