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The City of Portland, Oregon

Environmental Services

working for clean rivers

Phone: 503-823-7740

Fax: 503-823-6995

1120 SW 5th Ave, Suite 613, Portland, OR 97204

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What does it look like?

Water primrose has waxy, oblong leaves with pronounced veins and smooth edges. Its stems have a reddish tinge, especially in later summer, and often stand up off the water’s surface. Between late July and early September, water primrose produces yellow flowers about one inch across.

water primrose

notice how Ludwigia has both round AND pointed leaves, as well as the 5-petaled flower

water primrose

note the red stems common to both native and non-native Ludwigia species