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Perennial herbs, typically submersed, with four-lobed schizocarp fruit that splits into one-seeded nutlets. Submersed leaves are pinnately dissected. An introduced species with enormous potential for invasiveness. Completely submerged except for the flower spike.
Most rooted and free-floating submersed weeds in ponds are readily controlled with triploid grass carp; control may be poorer on the watermilfoils, particularly Eurasian waterfoil.
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Thrives in cool water. Will top-out during peak growth periods, with most biomass near water surface, and form dense, almost impenetrable mats. Typically a larger problem across the northern tier of the U.S.
Whorled, thin, and divided into delicate segments resembling a bird's feather. Typically green, but actively growing leaves will be reddish. Although this plant is submersed, some leaves also grow above the water level. These leaves are stiffer and have more substance, while the submerged leaves are flimsy and have no form when removed from the water.
Tiny and inconspicuous. Borne on leaf axils of emergent spikes.
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