This is also called Brazilian waterweed. It is extensively sold in the aquarium industry usually under the name “anacharis”. Brazilian elodea is found in the submersed plant community. It may grow in substrates of sand, mud, or stone to depths of 6.5 meters. A buoyant plant, most of its biomass is produced near the water surface. Infestations of Brazilian elodea may occur in large dense rooted stands and drifting mats. Infestations of Brazilian elodea reduce the abundance and diversity of native plants and may cause a decline in water quality. Dense stands restrict water movement and trap sediments, and may alter the natural bathymetry, storage capacity of the water body. Dense beds also interfere with navigation and traditional recreational uses. <www.invasive.org>
Brazilian elodea is known to occur in 9 lakes in 6 counties in Indiana. Those counties with sites that contain Brazilian elodea are: Bartholomew, Dearborn (3 sites), Floyd, Harrison, Monroe (2 sites), and Posey. These sites that contain Brazilian elodea are currently under eradication.