Carex pensylvanica #1 (Pennsylvania / Oak Sedge)

Pennsylvania Sedge, also known as Oak Sedge because of its tendency to grow among stands of Oak trees, can make an excellent native lawn substitute for dry shade. It has a delicate texture with medium green foliage and flowers very early in the season, providing food for various bird species. The roots form loose colonies that spread primarily by rhizomes and not typically from seed. This species is used extensively for tough, dry shade situations.

Sources:
Native Ferns, Moss, & Grasses by William Cullina
Missouri Botanical Garden
Lady Bird Johnson Wildflower Center
Illinois Wildflowers
Master Gardeners of Northern Virginia