Polygonum spergulariiforme

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
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: 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 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. "Polygonum spergulariiforme Calflora". www.calflora.org. Retrieved 2022-11-03.
  5. "Polygonum spergulariiforme in Flora of North America @ efloras.org". www.efloras.org. Retrieved 2022-11-03.

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