Flowering rush (Butomus umbellatus) resembles a large sedge, with upright foliage that grows in shallow water, though it may also grow submerged. Its leaves have a triangular cross-section with a twist toward the tip. The easiest way to identify it is by the flowers, which are light pink with 6 petals and grow in clusters.
Flowering rush grows around lake shores, ponds, wetlands, streams, and in drainage ditches.
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This species can spread rapidly, choking out other native species. It can also weaken shorelines and cause a disruption in recreational activities such as boating or swimming.