| Family | Scientific Name | Common Name | Habitat | Distribution | Image |
|---|---|---|---|---|---|
| Cyperaceae | Cyperus squarrosus var. runyonii | Texas Awned Flatsedge | On sands or granite. | C. OK south to c. TX and s. TX. Reports of C. granitophilus from this area (O'Kennon & Taylor 2015) represent this taxon (Lowe & Carter 2023). | |
| Cyperaceae | Cyperus squarrosus var. squarrosus | Awned Flatsedge | Moist depressions and seepages on granitic and other rocks, drawdown riverbanks, swales, shores, coastal rock barrens, other moist disturbed sites, cracks in sidewalks and pavement. | Nearly cosmopolitan in distribution, in Old World and New World. The distribution of C. squarrosus var. squarrosus in precolonial North America is very uncertain. |  |
| Cyperaceae | Cyperus subsquarrosus | Smallflower Halfchaff | Riverbank draw-down zones, other moist sandy areas, like seasonally flooded shores of artificial impoundments. | ME west to ON and MN, south to s. FL and TX; south into tropical America. |  |