Dig deeper at SERNEC, a consortium of southeastern herbaria.
Very similar to C. corrugata, and both often have a transverse crease near the tip of the perigynium. Read more at Vascular Plants of North Carolina.
Spermatophytes (seed plants): Angiosperms (flowering plants): Monocots: Commelinids: Poales
Synthesis of the North American Flora (Kartesz, 1999)
Carex amphibola var. amphibola
Manual of the Southeastern Flora (Small, 1933)
Eastern Narrowleaf Sedge