Myriophyllum aquaticum Photo credit: © Dr. Erica Bower/Flickr
Nymphoides peltata Photo credit: 영철 이, Flickr Creative Commons
Hydrilla verticillata Photo credit: Graves Lovell, Alabama DCNR, Bugwood.org
Trapa natans Photo credit: © Fredy Wyss/Flickr
Common: Species found in at least 1/3 of Pennsylvania counties. (This does not include cultivated occurrences.)
Uncommon: Species found in Pennsylvania, but not widespread (i.e., found in less than 1/3 of Pennsylvania counties.)
Not present: Species not yet found in Pennsylvania.
Note: Species list updated in September 2021.