Polygonum engelmannii explained

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.^[1]

Polygonum engelmannii is an branching herb up to 30 cm (1 foot) tall. It has clusters of green or purple flowers.^{[2] [3]}

Notes and References

1. http://bonap.net/MapGallery/County/Polygonum%20engelmannii.png Biota of North America Program 2014 county distribution map
2. 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
3. https://www.biodiversitylibrary.org/page/3154466#page/192/mode/1up Greene, Edward Lee. 1885. Bulletin of the California Academy of Sciences 1(3): 126