Polygonum achoreum

{{Short description|Species of flowering plant}}

{{Speciesbox

| image = Polygonum achoreum (4985271408).jpg

| genus = Polygonum

| species = achoreum

| authority = S.F.Blake (1917)

| synonyms_ref = [http://www.theplantlist.org/tpl1.1/record/tro-26000824 The Plant List, Polygonum achoreum S.F. Blake ]

| synonyms = *Polygonum erectum subsp. achoreum (S.F. Blake) Á. Löve & D. Löve

}}

Polygonum achoreum, common names Blake's knotweed, leathery knotweed{{PLANTS|id=POAC3|taxon=Polygonum achoreum|accessdate=12 October 2015}} or striate knotweed,Brako, L., A.Y. Rossman & D.F. Farr. 1995. Scientific and Common Names of 7,000 Vascular Plants in the United States 1–294. is a North American species of plants in the buckwheat family. It is widespread across much of Canada and the northern United States.[http://bonap.net/MapGallery/State/Polygonum%20achoreum.png Biota of North America Program 2014 state-level distribution map]

Polygonum achoreum is an herb up to {{convert|70|cm|in|abbr=on}} tall with yellow-green flowers in flat-topped clusters.[http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=242417024 Flora of North America, Polygonum achoreum S. F. Blake, 1917. ][https://www.biodiversitylibrary.org/page/569493#page/236/mode/1up Blake, Sydney Fay. 1917. Rhodora 19(226): 232–234] descriptions in English and Latin, commentary in English