''Polygonum parryi'' is a species of flowering plant in the
knotweed family known by the common names Parry's knotweed and prickly knotweed.
[ It is native to the western United States from ]Washington
Washington commonly refers to:
* Washington (state), United States
* Washington, D.C., the capital of the United States
** A metonym for the federal government of the United States
** Washington metropolitan area, the metropolitan area centered on ...
to California
California is a U.S. state, state in the Western United States, located along the West Coast of the United States, Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the List of states and territori ...
, where it grows in several types of moist, open habitat in mountainous and coastal areas.Calflora taxon report, University of California, ''Polygonum parryi'' E. Greene, Parry's knotweed
/ref>
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
An ochrea (Latin ''ocrea'', greave or protective legging), also spelled ocrea, is a plant structure formed of stipules fused into a sheath surrounding the stem, and is typically found in the Polygonaceae
The Polygonaceae are a family of flower ...
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 ]
/ref>
References
External links
Jepson Manual TreatmentCalphotos Photo gallery, University of California
parryi
Flora of the West Coast of the United States
Flora of California
Plants described in 1891
Taxa named by Edward Lee Greene
Flora without expected TNC conservation status
{{Polygonaceae-stub