Polygonum engelmannii

{{Short description|Species of flowering plant}}

{{Speciesbox

|image =

|status =

|status_system =

|genus = Polygonum

|species = engelmannii

|authority = Greene 1885

|synonyms_ref = [http://www.tropicos.org/Name/26000856 Tropicos, Polygonum engelmannii Greene ]

|synonyms = *Polygonum douglasii subsp. engelmannii (Greene) Kartesz & Gandhi

}}

Polygonum engelmannii, common name Engelmann's knotweed, is a North American species of plants in the buckwheat family. It is native to western Canada and the western United States, usually at high elevations in the mountains. It has been found in Alberta, British Columbia, Idaho, Montana, Wyoming, Nevada, Utah, and Colorado.[http://bonap.net/MapGallery/County/Polygonum%20engelmannii.png Biota of North America Program 2014 county distribution map]

Polygonum engelmannii is an branching herb up to 30 cm (1 foot) tall. It has clusters of green or purple flowers.[http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=250060734 Flora of North America, Polygonum engelmannii Greene, 1885. (as engelmanni). Engelmann's knotweed ][https://www.biodiversitylibrary.org/page/3154466#page/192/mode/1up Greene, Edward Lee. 1885. Bulletin of the California Academy of Sciences 1(3): 126]