| Family | Scientific Name | Common Name | Habitat | Distribution | Image |
|---|---|---|---|---|---|
| Cyperaceae | Carex divisa | Divided Sedge, Separated Sedge | Brackish and oligohaline marshes. | Native of the Old World. |  |
| Cyperaceae | Carex duriuscula | Spikerush Sedge | Apparently a waif in urban St. Louis, MO. | Native of w. and nc. North America, east to n. IL. | |
| Cyperaceae | Carex praegracilis | Freeway Sedge | Medians of interstate highways. | Native of w. North America south to c. Mexico. This species is apparently spreading through ne. North America as the result of the winter salting of highways. |  |