| Cyperus erythrorhizos Muhl. |
| Currently Accepted Name: | Cyperus erythrorhizos Muhl. |
| Locality: | United States. Kentucky. Madison: Edge of wildflower plot and shoulder side ditch, I-75, ca. 0.5 mi N of jct I-75 and KY 595, Exit 77, Berea. |
| Habitat: | Edge of wildflower plot and shoulder side ditch. Tufted annual with red roots, crowded leaves and several involucral bracts. Spikelets 3-12 x 1.0-1.5 mm on keeded red-brown sides; infrequent. Associates: Festuca elatior, Paspalum laeve, Setaria faberi. |