| united states | delaware | carex atlantica | species | 2 | 0 |
| united states | florida | carex atlantica subsp. atlantica | subspecies | 2 | 0 |
| united states | florida | carex atlantica subsp. capillacea | subspecies | 4 | 0 |
| united states | pennsylvania | carex atlantica subsp. capillacea | subspecies | 2 | 0 |