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Japanese Knotweed

• University of Idaho - 21 New Noxious Weeds in Idaho - Japanese knotweed (2MB PDF File)
• USDA National Invasive Species Information Center - Japanese knotweed
• Plant Conservation Alliance, Alien Plant Working Group - Japanese knotweed
• Also see the Japanese Knotweed photo gallery and information in the Virtual Field Guide - Noxious Weed List section.