Flowering rush, also known as water gladiolus or grassy rush, is a moderately tall aquatic perennial that resembles a rush or a large sedge but is actually neither, being the sole member of the family Butomaceae. Native to Europe, Asia and Africa, it has become naturalized throughout the Great Lakes and other regions of Canada and the USA where it has been problematic due to its ability to displace native vegetation, alter nutrient cycling, negatively impact fish and wildlife habitat, and interfere with recreational activities and irrigation systems.
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