Eurasian watermilfoil (scientific name: Myriophyllum spicatum) is an invasive aquatic weed widely distributed in the eastern hemisphere that entered the United States either through ballast water or the aquarium trade sometime between the 1880s and 1940s. It grows in dense mats, crowds out native aquatic plants, and severely degrades the recreational boating experience and associated lakefront property values. It is found in the Northwest, Midwest, Pacific Coast, and some areas of the Southeast.
Eurasian milfoil
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