Floating Primrose-Willow

Ludwigia peploides
Family Name:	Onagraceae
Class:	A
Other Names:	creeping water primrose
Why is it a noxious weed?	It forms dense, fast-growing, floating mats that can displace native aquatic plants and wetland grasses. Mats can also lower dissolved oxygen and pH of the water, reduce water quality for wildlife and increase sedimentation.

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Visit Washington State Noxious Weed Control Board Here