Carex emoryi
Carex emoryi, the riverbank tussock sedge or Emory's sedge, is a species of sedge native to Canada, the United States, and the states of Chihuahua and Coahuila in northern Mexico. It grows along the banks of rivers and streams. It also occurs on sand and gravel bars in streams. It spreads by means of underground rhizomes. "Carex emoryi" is sometimes planted in retention ponds for erosion prevention and maintenance reduction along shorelines.