water pepper (swamp smartweed)

August 27, 2021 • Scappoose Bay • Columbia County, Oregon

Coordinates: 45.82484,-122.83964 (click for map)
water pepper (swamp smartweed) (Persicaria hydropiperoides (Polygonum hydropiperoides)) [Scappoose Bay, Columbia County, Oregon]
Filename: 20210827-114834.jpg 1723x2297 pixels, ISO 125, f5.4 @ 1/400 sec
Persicaria hydropiperoides (Polygonum hydropiperoides)

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

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