Swamp flatsedge (Distinct sedge) – Cyperus distinctus
Distinct sedge grows along marshy shores, depressions, and flatwoods; and in ditches, throughout most of peninsular Florida. Distinct sedge has the typical form of the genus. The stem of this species is usually 2 or 3 feet tall. It is smooth and triangular. Distinct sedge may have a few narrow leaves growing from the base of the plant. As with other cyperus species, this one has conspicuous leaf-like bracts around the base of the inflorescence. Some bracts may be much longer than the inflorescence itself. The inflorescence of distinct sedge has several almost-spherical clusters of spikelets. The clusters are at the tops of short and long stalks. The spikelets of the species are flattened. The scales of the spikelets spread wide open, away from the central axis of the spikelet. Distinct sedge is another typical umbrella sedge with a second distinctive spikelet form. Its stems are smooth and triangular. It has several bracts below the inflorescence. Some bracts are much longer than the inflorescence. Spikelets of distinct sedge are in spherical clusters. Spikelets are flattened, with scales that are very open.
For brief control information, see Efficacy of Herbicide Active Ingredients Against Aquatic Weeds by K. Langeland, M. Netherland, and W. Haller.