伊乐藻属，水鳖科的一个沉水植物属，其种类成为池塘及流水道中的杂草，故俗名水草或沟藓。可用于水族馆，实验室内用作实验细胞活性的材料。

Elodea is a genus of aquatic plants often called the waterweeds described as a genus in 1803. Elodea is native to North and South America and is also widely used as aquarium vegetation. It lives in freshwater.

The introduction of some species of Elodea into waterways in parts of Europe, Australia, Africa, Asia, and New Zealand has created a significant problem and it is now considered a noxious weed in these areas. An older name for this genus is Anacharis, which serves as a common name in North America.