Species
Polygonum paronychia (Beach knotweed)
Polygonum paronychia. Photo: (c) icosahedron, some rights reserved (CC BY)
Polygonum paronychia is a species of flowering plant in the knotweed family known by the common names dune knotweed, black knotweed, and beach knotweed. It is native to the coastline of western North America from British Columbia to California, where it grows in sandy coastal habitat such as beaches, dunes, and scrub.
Sightings
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