Sedges: Carex is the fourteenth volume of The Illustrated Flora of Illinois series and the sixth and last volume devoted to monocots— plants that have a single seed leaf, or cotyledon, upon germination. Since the volume’s original publication in 1999, thirty-four additional species of plants have been recognized in Illinois. For each species of Carex in Illinois, there is a full illustration showing the habit of the plant and close-ups of various vegetative and reproductive structures that are crucial for the identification of the individual species. There is also a complete description of each species as well as a detailed discussion of the nomenclature and habitats. Range maps show the county distribution of each species in Illinois. A new and detailed key is provided for identification of the species.