Polygonum spergulariiforme

Polygonum spergulariiforme
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Core eudicots
Order: Caryophyllales
Family: Polygonaceae
Genus: Polygonum
Species: P. spergulariiforme
Binomial name
Polygonum spergulariiforme
Meisn. ex Small 1892
Synonyms[1]
  • Polygonum sperguliaeforme Meisn. ex Small
  • Polygonum douglasii subsp. spergulariiforme (Meisn. ex Small) J.C. Hickman
  • Polygonum coarctatum Dougl. ex Meisn. 1856 not Meisn. 1826[2]

Polygonum spergulariiforme is a North American species of flowering plants in the buckwheat family known by the common name spurry knotweed or fall knotweed. It grows in western Canada (British Columbia and Saskatchewan) and the western United States (primarily Washington, Oregon, and northern and central California but with a few isolated populations in Idaho, Wyoming and Montana).[3][4]

Polygonum spergulariiforme is a green, branching herb up to 50 cm (20 in) tall. Leaves are narrow, up to 6 cm (2.4 in) long. Flowers are pink or white, in dense, elongated clumps. The plant flowers from June to October, later than some of its relatives.[5]

References

  1. ↑ Tropicos, Polygonum spergulariiforme Meisn. ex Small
  2. ↑ Meisner, Carl Daniel Friedrich, in Small, John Kunkel. 1892. Bulletin of the Torrey Botanical Club 19(12): 366. Polygonum sperguliaeforme
  3. ↑ Biota of North America Program 2014 county distribution map
  4. ↑ Calflora taxon report, University of California, Polygonum spergulariiforme Meisn. ex Small Spurry knotweed
  5. ↑ Flora of North America, Polygonum spergulariiforme Meisner ex Small, 1892. (as spergulariaeforme). Spurry or fall knotweed

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