Curlyleaf pondweed is an invasive plant species that originates in Asia, Africa, and Europe. An invasive plant has the ability to thrive and spread aggressively outside its native range. This is harmful to the local ecosystem and has the potential to greatly reduce the natural biodiversity of an area by outcompeting native species. These plants grow submersed, with flattened stems that form dense stands in water up to 5 meters deep. They have alternate leaves 3-8 cm wide with wavy edges and a prominent mid-vein. Flowers are brown and inconspicuous, and the fruit is an oval 3 mm long. This species reproduces via turions and seeds.
Connecticut's Invasive Aquatic and Wetland Plants Identification Guide, Bulletin 1027, Invasive Aquatic Plant Program, The Connecticut Agricultural Experimentation Station
Invasive Plant Species, National Agricultural Library, United States Department of Agriculture