Polygonum achoreum

Polygonum achoreum, common names Blake's knotweed,^[2] leathery knotweed^[3] or striate knotweed,^[4] is a North American species of plants in the buckwheat family. It is widespread across much of Canada and the northern United States.^[5]

Polygonum achoreum
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Order:	Caryophyllales
Family:	Polygonaceae
Genus:	Polygonum
Species:	P. achoreum
Binomial name
Polygonum achoreum S.F.Blake (1917)
Synonyms[1]
Polygonum erectum subsp. achoreum (S.F. Blake) Á. Löve & D. Löve

Polygonum achoreum is an herb up to 70 cm (28 in) tall with yellow-green flowers in flat-topped clusters.^[2][6]