Polygonum parryi is a species of flowering plant in the Polygonaceae known by the common names Parry's knotweed and prickly knotweed.[ 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.][ Biota of North America Program 2014 county distribution map][ Calflora taxon report, University of California, Polygonum parryi E. Greene, Parry's knotweed ]
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.[ Flora of North America, Polygonum parryi Greene, 1881. Parry's or prickly knotweed ]
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