Hi, Dr. Hill,
This sedge is growing along a pond in the fall line, full sun. The blades are narrow and wiry. The seed heads are at the tips of the stem, first appearing late-April/mid-May and were ripening in mid-May.
I sent the pictures you sent to Paul Marcum, a colleague here in Illinois who knows more about sedges than I do. He replied “This one is definitely Carex section Stellulatae (star sedges), with the seemingly long perigynia it might be Carex ruthii (Ruth’s sedge).”
Dr. Steven Hill, Botanist, SCNPS