Polygonum sawatchense

{{Short description|Species of flowering plant}}

{{Speciesbox

| image = Polygonum sawatchense ssp. sawatchense -21291 (7727008662).jpg

| genus = Polygonum

| species = sawatchense

| authority = Small 1893

| synonyms_ref = [http://www.theplantlist.org/tpl1.1/record/kew-2574425 The Plant List, Polygonum douglasii subsp. johnstonii (Munz) J.C.Hickman ]

| synonyms = *Polygonum douglasii subsp. johnstonii (Munz) J.C.Hickman

• Polygonum douglasii var. johnstonii Munz

}}

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.[http://bonap.net/MapGallery/County/Polygonum%20sawatchense.png Biota of North America Program 2014 county distribution map, Polygonum sawatchense][https://www.biodiversitylibrary.org/page/9310011#page/1670/mode/1up Costea, 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 {{convert|50|cm|in|abbr=on}} tall. Leaves are narrow, up to {{convert|45|mm|in|abbr=on}} long. Flowers are green, red, or white, in elongated arrays.[http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=250060758 Flora of North America, Polygonum sawatchense Small, 1893. ][https://www.biodiversitylibrary.org/page/703302#page/268/mode/1up Small, John Kunkel 1893. Bulletin of the Torrey Botanical Club 20(5): 213–214] description in English[https://www.biodiversitylibrary.org/page/703302#page/290/mode/1up Small, 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