water pepper (swamp smartweed)

September 7, 2021Rooster Rock State ParkMultnomah County, Oregon

Coordinates: 45.55342,-122.21129 (click for map)
water pepper (swamp smartweed) (Persicaria hydropiperoides (Polygonum hydropiperoides)) [Rooster Rock State Park, Multnomah County, Oregon]
Filename: 20210907-130315.jpg 2880x2160 pixels, ISO 200, f7.1 @ 1/500 sec
Persicaria hydropiperoides (Polygonum hydropiperoides)

There's a chance this is actually Persicaria hydropiper, which is not native.

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