Scirpus hattorianus Makino. Phen: Jun-Sep. Hab: Seepages, ditches, marshes, wet meadows, mostly at moderate to high elevations. Dist: NL (Newfoundland) to w. ON and WI, south to MD, NC, OH, and IN.
Origin/Endemic status: Native
Syn: = FNA23, Il, K1, K3, K4, Mi, NE, Pa, Va, Schuyler (1967); < Scirpus atrovirens – GW1, RAB, W; < Scirpus atrovirens var. atrovirens – C, F, G, WV