Egeria densa

Egeria densa (syn. Anacharis densa (Planch.) Vict., Elodea densa (Planch.) Casp.; large-flowered waterweed or Brazilian waterweed) is a species of Egeria native to warm temperate South America in southeastern Brazil, Argentina, and Uruguay. It is considered a problematic invasive species due to its use in home aquariums and subsequent release into non-native habitats.