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Douglas' Knotweed (Polygonum douglasii)

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Polygonum Douglasii, or more commonly know as Douglas' Knotweed, is a forb/herb (a forb/herb is a non-woody plant that is not a grass) of the genus Polygonum. Its duration is annual which means it grows for one season only. Polygonum Douglasii or Douglas' Knotweed's floral region is North America US Lower 48, specifically in the states of Arizona, California, Colorado, Iowa, Idaho, Maryland, Maine, Michigan, Minnesota, Montana, North Dakota, Nebraska, New Hampshire, New Mexico, Nevada, New York, Oregon, South Dakota, Utah, Vermont, Washington and Wyoming.

  • Category: Dicot
  • Genus: Polygonum
  • Family: Polygonaceae
  • Order: Polygonales
  • Class: Magnoliopsida
  • Division: Magnoliophyta
  • Duration: Annual
  • Growth Habit: Forb/herb
  • Native Status: L48 (N) CAN (N)
  • State T/E Status: IA (E) ME (T) NH (T) NY (T) VT (E)
  • State T/E Common Name: IA (Douglas' knotweed) ME (Douglas' knotweed) NH (Douglas' knotweed) NY (Douglas knotweed) VT (Douglas knotweed)
  • National Wetland Indicator Status: UPL FAC
  • Regional Wetland Indicator Status: 1(UPL) 3(FACU) 4(FAC) 5(FACU-) 7(UPL) 8(UPL) 9(FACU) 0(FACU)





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