Catabrosa aquatica, called brookgrass, water whorl-grass, water whirlgrass and water hairgrass, is a widespread species of semi-aquatic grass in the genus Catabrosa, native to most of the non-tropical northern hemisphere, and to southern Chile and Argentina.

[3][4] As its scientific and common names suggest, it prefers to grow in wet areas, such as meadows, stream banks and lake shores.

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