Cottongrass gets its name from fluffy seed heads. These plants are common in boggy areas in the northern hemisphere, particularly in boreal areas. The fluff was used for anything where padding or batten is needed. The softer part of the plant is edible, as are the seeds. The Alaskan name for the seeds translates as mouse-nuts. The greenkeel species grows in AK, CO, CT, IA, ID, IL, IN, MA, ME, MI, MN, MT, ND, NH, NJ, NY, OH, PA, RI, VT, WA, WI, WY, throughout Canada, and on SPM. Mackinac Co MI, 5/27/17. Sedge family, Cyperaceae.