Artemisia tridentata
The vegetation in the range of "C. aboriginum" is chiefly sagebrush steppe, dominated by "Artemisia tridentata", "Purshia tridentata", and "Pseudoroegneria spicata". Much of this habitat has been affected by livestock grazing. "Carex aboriginum" flowers earlier than many other sedges in its native range, lasting from mid-May to early June.