† Populations may not be currently present.
References: (click for full references)
Crow, G. E. and C. B. Hellquist. 2000. Aquatic and wetland plants of Northeastern North America. Volume 1. The University of Wisconsin Press, Madison, Wisconsin.
Les, D.H. and L.J. Mehrhoff. 1999. Introduction of nonindigenous aquatic vascular plants in sourhtern New England: a historical perspective. Biological Invasions. 1(2/3). pp. 281-300.
Moody, M.L. and D.H. Les. 2002. Evidence of hybridity in invasive watermilfoil (Myriophyllum) populations. Proceedings of the National Academy of Science 99(23): 14867–14871.
Thum, R.A. and J.T. Lennon. 2006. Is Hybridization Responsible for Invasive Growth of Non-indigenous Water-milfoils? Biological Invasions 8(5): 1061-1066.
This information is preliminary or provisional and is subject to revision. It is being provided to meet the need for timely best science. The information has not received final approval by the U.S. Geological Survey (USGS) and is provided on the condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from the authorized or unauthorized use of the information.