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Polygonum paronychia
Also called Black Knotweed, Dune Knotweed
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.
The plant has been made into a poultice to treat whitlow infections.
Leathery knotweed · Knotweed · Polygonum albanicum · Polygonum amgense · European knotweed · Oval-leaf knotweed · Austin's Knotweed · Prostrate knotweed · Narrowleaf knotweed · Bidwell's knotweed · Bolander's knotweed · Northern Knotgrass
Text excerpted from the Wikipedia article Polygonum paronychia by its contributors, under CC BY-SA 4.0; the excerpts are shared under the same licence.
Life form, climate and native range: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 3.0), reformatted; see Plants of the World Online.
