==External links==*Comb Water-Milfoil, Myriophyllum verticillatum, Massachusetts Division of fisheries & Wildlife, viewed on May 2009*Maine Field Guide to Invasive Aquatic Plants, Whorled water-milfoil, March 2009*Plants For A Future, Myriophyllum verticillatum, viewed on March 2009*USGS, Western Wetland Flora: Whorled water-milfoil, viewed on March 2009*Whorled Leaf Water Milfoil, viewed on March 2009*Wisconsin Department of Natural resources, Native Water-milfoils, viewed on March 2009
*Comb Water-Milfoil, Myriophyllum verticillatum, Massachusetts Division of fisheries & Wildlife, viewed on May 2009*Maine Field Guide to Invasive Aquatic Plants, Whorled water-milfoil, March 2009*Plants For A Future, Myriophyllum verticillatum, viewed on March 2009*USGS, Western Wetland Flora: Whorled water-milfoil, viewed on March 2009*Whorled Leaf Water Milfoil, viewed on March 2009*Wisconsin Department of Natural resources, Native Water-milfoils, viewed on March 2009