Posted by NY Sea Grant has factsheets on several invasive plants: Water Chestnut (Trapa natans) and
European Frog-Bit (Hydrocharis morsus-ranae), as well as another wet area plant, Giant Hogweed (Heracleum mantegazzianum). PDF
versions can be found on the Aquatic Invasive Plant Educational
Materials and Projects page of NY Sea Grant's Aquatic Invasive Species website: http://www.nysgextension.org/ans/anspages/AIPlants.html
Source: Charles R. O'Neill, Jr., Sr. Extension Specialist, Cornell University/New York Sea Grant
Director, National Aquatic Nuisance Species Clearinghouse
Lake Stewardship 