Eurasian watermilfoil appears brownish-green to brown, usually with some red on stems.  Stems may be up to 3 meters and have clusters of 4 or 5 feather-like leaves that are more abundant near stem tips than lower stems.  Each leaf has between 5 and 24 pairs of small leaflets.  Eurasian watermilfoil is a European invader of water bodies in North America that may spread from lake to lake by small fragments transported by boats and trailers.  This milfoil can crowd out other underwater plants used by fish and waterfowl.  However, Eurasian watermilfoil provides habitat to many aquatic animals because it has many fine leaves and overwinters as a decaying mat upon which they feed.