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water-milfoil (Myriophyllum spp.)

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water-milfoil (Myriophyllum spp.; WATER-MILFOIL FAMILY [Haloragaceae])  Eight species (7 native) of perennial submersed aquatic plants.  Whorled pinnately divided leaves with thread-like leaflets.  Flower head spike held above water surface.  Bottom-rooted in still water to 15 deep with stems trailing just below the surface.  Eurasian water-milfoil is an introduced species which forms dense mats of foliage which displace native aquatic plants and degrade fish habitat.  [086]

 

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