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@Sarah I checked Knotweed, its different specie if compare the leafs but from same Polygonaceae family of Redshank.http://en.wikipedia.org/wiki/Knotweed
I always called this "knot weed" :)
Monkey mind its a same thing..?http://www.projectnoah.org/spottings/640...
Spotted on Jul 8, 2011 Submitted on Jul 8, 2011