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

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.

Beach knotweed beginning to bloom at left on sand dunes on Bayocean Spit at the western edge of Tillamook Bay, northern Oregon coast.........August 26, 2009. The image at right shows beach knotwee blooming on sand dunes at Bayocean Spit on the western edge of Tillamook Bay, northern Oregon coast.....June 20, 2024.

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.

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

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

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.