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The City of Portland, Oregon

Environmental Services

working for clean rivers

Phone: 503-823-7740

Fax: 503-823-6995

MAILING ADDRESS: 1120 SW 5th Ave, Room 1000, Portland, OR 97204

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Water Primrose

Ludwigia peploides ssp. montevidensis and L. hexapetala (water primrose)

Several species and subspecies of water primrose, a plant native to South America, have been a substantial problem in the drainage and irrigation canals of central California. In recent years, these species have also become a concern in the mid and lower Willamette, as well as in the Puget Sound region. In the Portland area, most patches of Ludwigia are known along the slower-moving waters of the Columbia Slough.