Polygonum majus is a North American species of flowering plant in the buckwheat family known by the common name wiry knotweed. It grows in the western United States and western Canada, from British Columbia south as far as the Sierra Nevada of northwestern Inyo County in California, east as far as Montana.[2][3] Knotweed is a spreading, wiry annual weed that rarely grows higher than a few inches. The leaves are tiny, oblong, bluish-green, and 14 inches broad and 1 inch long. The flowers are tiny and unobtrusive, whitish-green in colour, and appear in the leaf axils in the fall. Knotweed may grow into a dense mat with a diameter of up to three feet, strangling out ideal grass and plants.[3] The branches of this evergreen plant form a strong, wiry mat that reaches barely a few centimeters above the earth.[4] They appear constantly, and gardeners are always fighting them.[2]
^The Plant List, Polygonum majus (Meisn.) Piper
^ abBiota of North America Program 2014 county distribution map
^ abCalflora taxon report, University of California, Polygonum majus (Meisn.) Piper Large douglas' knotweed
^Cite error: The named reference :2 was invoked but never defined (see the help page).
Polygonummajus is a North American species of flowering plant in the buckwheat family known by the common name wiry knotweed. It grows in the western...
considered to be useful in treating bruises, as herb Margaret. Bullwort - Ammi majus. Bishop's wood. Bullock's or Cow's Lungwort - Verbascum thapsus, the common...
villosum (†) R. Br. ex Fresen Persicaria perfoliata (†) (L.) H. Gross (= Polygonum perfoliatum L.) Petroselinum crispum (†) (M) (Mill.) A.W. Hill Physalis...
Notes Adila Bistort [1] Arum [2] Persicaria bistorta, also classified as Polygonum bistorta [3] Arum maculatum [4] ^ primary source for this meaning as yet...
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