Brazilian waterweed
Also known as Egeria densa
Elodea densa, the large-flowered waterweed or Brazilian waterweed, is a species of Elodea native to warm temperate South America in southeastern Brazil, Argentina, Chile, and Uruguay. It is considered a problematic invasive species due to its use in home aquariums and subsequent release into non-native ecosystems.
From Wikipedia, licensed under CC BY-SA 4.0
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