| Family | Scientific Name | Common Name | Habitat | Distribution | Image |
|---|---|---|---|---|---|
| Cyperaceae | Cyperus thyrsiflorus | Southern Flatsedge | Calcareous woodlands/hammocks, swamp edges, and shell middens. | E. South Carolina south to s. Florida, west to se. Texas; West Indies; Mexico to South America. |  (c) Smith, Jake - CC-BY-NC, permission granted to NCBG |
| Cyperaceae | Cyperus pseudothyrsiflorus | Disturbed areas, damp soils. | Texas and s. New Mexico south into Mexico. |