Polygonum parryi

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Polygonum parryi
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Core eudicots
Order: Caryophyllales
Family: Polygonaceae
Genus: Polygonum
Species: P. parryi
Binomial name
Polygonum parryi
Greene 1891

Polygonum parryi is a species of flowering plant in the knotweed family known by the common names Parry's knotweed and prickly knotweed.[1] It is native to the western United States from Washington to California, where it grows in several types of moist, open habitat in mountainous and coastal areas. [2][3]


Polygonum parryi is a small annual herb forming mats or cushions of short, angled stems growing erect up to 7 or 8 centimeters (2.8-3.2 inches) in height. The greenish brown stems are lined densely and evenly with linear, spine-tipped leaves. The lowest leaves are longest, reaching up to 2 centimeters (0.8 inches) long, while leaves near the branch tips are small and scale-like. Each leaf has a thin, wide stipule which forms a fringed, fibrous ochrea around the base of the leaf. White flowers less than 2 millimeters (0.08 inches) wide occur in the leaf axils.[1]


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