Awl Fruited Sedge (Carex stipata)
Sedges have edges goes the old saying. Stems on sedges are triangular and can be felt by rolling them between your fingers.
The sedge grows to be about 1-3.5 feet tall. Relatively large green-to-black spike-like inflorescence, with long, bright green strap-like leaves growing from a clump below. Stems clump-forming to 3' tall, stout, shorter than leaves. Leaf blades to 3/8" wide. Sheaths loose, papery.