River bulrush is a tall wetland species that forms large, dense stands in saturated soils or shallow water. The triangular stems are coarse and have leaves with rough edges. The spikes have a 3-parted style in loose clusters. It grows in ponds and marshes, and along lake shores and river banks. It spreads by rhizomes with tubers that form new shoots, which create colonies that prevent erosion by waves or currents. River bulrush provides food for waterfowl and habitat for spawning fish.