Scirpus cyperinus, commonly known as woolgrass, is a herbaceous emergent that is native to the eastern United States and eastern Canada. Other common names include cottongrass bulrush and brown woolly sedge. This plant grows in many types of wet habitat, such as marshes and ponds. It can be found in disturbed habitat, such as ditches. This plant often hybridizes with its relatives Scirpus atrocinctus and S. pedicellatus. Native Americans used this plant for a number of purposes. The Ojibwa people used it to make bags and mats, and the Potawatomi people used it to stuff pillows.