Eurasian Watermilfoil

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Myriophyllum spicatum
Family Name:	Haloragaceae
Class:	B
Other Names:	spike watermilfoil
Why is it a noxious weed?	It is an ornamental aquatic plant that has escaped cultivation. Infestations can alter aquatic ecosystems. It forms dense mats that shade out other aquatic plants, degrades water quality, inhibits water flow and impacts recreational activities.

More Information:

Visit Washington State Noxious Weed Control Board Here