|water-milfoil (Myriophyllum spp.)||
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. 
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