or brief control information, see Efficacy of Herbicide Active Ingredients Against Aquatic Weeds by K. Langeland, M. Netherland, and W. Haller.
Flat sedge has the typical overall appearance of the genus: few leaves at the plant base; long, leaf-like bracts around the base of the inflorescence; and clusters of narrow, pointed spikelets. Flatsedge grows abundantly along every kind of marshy shore and wet clearing throughout the state. Flatsedge grows from 4 to 30 inches tall. It may have a few leaves rising from the base of the plant, and a few loose sheaths. The leaves are about one-half-inch wide and may be as long as the plant. The base of the inflorescence has 3 to 10 conspicuous leaf-like bracts. The bracts are about one-half-inch wide and can be much longer than the inflorescence. The inflorescence of flat sedge may be very small or quite large: from 1 to 18 inches long. The inflorescence has several small, bottle-brush-like clusters of spikelets. The clusters are on very unequal stalks. Some may be short; and some, long. The spikelets are very narrow and relatively long. They have overlapping scales. This typical umbrella sedge has a few leaves rising from the base of the plant. It has several leaf-like bracts at the base of the inflorescence. Some bracts may be much longer than the inflorescence. It has several small, bottle-brush-like clusters of spikelets. The spikelets are very narrow and relatively long.