Japanese knotweed

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white flowers with green leaves in the background

Polygonum cuspidatum bush Knotweeds, also known as polygonums (or polygoni?) belong to knotweed family (Polygonaceae), a characterristic feature of this family being that lots of plant have swollen or at least dictinct joints. That is well reflected in the Latin name of the family: poly means "many" and goni means "knee" or "joint". As a typical representative of the family, polygonum is a classic example. There are a whole lots of polygonum species. Some grow in or near the water and some…

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