[Knotweeds: The Genus Polygonum West of the Cascade Mountains of Oregon and Washington]

Black Knotweed, Beach Knotweed, Nailwort Knotweed

Polygonum paronychia

Close-up of the flower of Black Knotweed, Beach Knotweed, Nailwort Knotweed: Polygonum paronychia - Black Knotweed, Beach Knotweed, Nailwort Knotweed: Polygonum paronychia

Close-up of the flowers and leaves of beach knotweed as seen at lefton sand dunes on Bayocean Spit at the western edge of Tillamook Bay, northern Oregon coast.........August 26, 2009. The photo at right shows beach knotweed from BayOcean Spit........July 6, 2020.

Close-up of the leaves of Black Knotweed, Beach Knotweed, Nailwort Knotweed: Polygonum paronychia

Beach knotweed beginning to bloom on sand dunes on Bayocean Spit at the western edge of Tillamook Bay, northern Oregon coast.........August 26, 2009.

Flower of Black Knotweed, Beach Knotweed, Nailwort Knotweed: Polygonum paronychia - Black Knotweed, Beach Knotweed, Nailwort Knotweed: Polygonum paronychia - Black Knotweed, Beach Knotweed, Nailwort Knotweed: Polygonum paronychia

Close-up views of the flowers and leaves of beach knotweed as seen above the beach at the Hatfield Marine Science Center in Newport, OR..............October 7, 2009.

Black Knotweed, Beach Knotweed, Nailwort Knotweed: Polygonum paronychia - Black Knotweed, Beach Knotweed, Nailwort Knotweed: Polygonum paronychia

Beach knoweed blooming on dunes on the inland side of Bayocean Spit on the northern Oregon coast...........August 25, 2012.

Flowers and stem leaves of Black Knotweed, Beach Knotweed, Nailwort Knotweed: Polygonum paronychia - Black Knotweed, Beach Knotweed, Nailwort Knotweed: Polygonum paronychia - Flowers and stem leaves of Black Knotweed, Beach Knotweed, Nailwort Knotweed: Polygonum paronychia

Beach knotweed beginning to bloom on dunes on the inland side of Bayocean Spit on the northern Oregon coast...........February 17, 2015.

Black Knotweed, Beach Knotweed, Nailwort Knotweed: Polygonum paronychia - Black Knotweed, Beach Knotweed, Nailwort Knotweed: Polygonum paronychia

Beach knotweed trying to bloom at left on the north jetty in Nehalem Bay State Park, northern Oregon Coast.........January 1, 2016. The photo at right shows beach knotweed in bloom on the north jetty in Nehalem Bay State Park, northern Oregon Coast.......October 17, 2018.

Paul Slichter