Polygonum parryi

Polygonum parryi
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	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]

Description[]

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]

References[]

External links[]

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[tammy-1] Jump up to: ^a ^b Flora of North America, Polygonum parryi Greene, 1881. Parry's or prickly knotweed

[2] Biota of North America Program 2014 county distribution map

[3] Calflora taxon report, University of California, Polygonum parryi E. Greene, Parry's knotweed

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