Seaside arrowgrass grows on margins of wet areas, and in fens and bogs. Its ability to be at home in those acidic and alkaline extremes is one of its advantages. It then protects itself by producing cyanide. You don't want it in your pasture! Those feathery tufts are the stigmas. It's successful enough to grow around the world. Here it's in AK, AZ, CA, CO, CT, DE,IA(T), ID, IL(T), IN, KS, MA, MD, ME, MI, MN, MT, ND, NE, NH, NJ(E), NM, NV, NY, OH(T), OR, PA, RI, SD, UT, VT, WA, WI, WY, across Canada, and on SPM. Wilderness State Park, Emmet Co MI, 5/27/12. Arrowgrass family, Juncaginaceae.