Polygonum sawatchense is a North American species of plants in the buckwheat family. It in the western United States and western Canada, from the Pacific Coast to the western Great Plains, so from British Columbia south to California and east as far as New Mexico, Colorado, Saskatchewan, and the Dakotas.Biota of North America Program 2014 county distribution map, Polygonum sawatchenseCostea, Mihai & Tardif, Francois J. 2003. Sida 20(4): 1631-1640 includes descriptions of both subspecies plus line drawings and photos taken with scanning electron microscope
Polygonum sawatchense is a branching, hairless herb up to tall. Leaves are narrow, up to long. Flowers are green, red, or white, in elongated arrays.Flora of North America, Polygonum sawatchense Small, 1893. Small, John Kunkel 1893. Bulletin of the Torrey Botanical Club 20(5): 213–214 description in EnglishSmall, John Kunkel 1893. Bulletin of the Torrey Botanical Club 20(5): plate CLVI (156) full-page line drawing of Polygonum sawatchense
Species is named for the Sawatch Range in Colorado, where Brandegee collected the type specimen.>
Subspecies Polygonum sawatchense subsp. oblivium Costea & Tardif - British Columbia, Washington, Oregon, California, Idaho, Nevada Polygonum sawatchense subsp. sawatchense - from Alberta + Saskatchewan south to Arizona + New Mexico
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