Scirpus atrocinctus Fernald. Phen: Jun-Jul. Hab: Bogs, wet meadows. Dist: NL (Newfoundland) and NL (Labrador) west to NT and BC, south to n. NJ, WV (Grant, Hampshire, Harrison, Pendleton, Pocahontas, Randolph, and Tucker counties), IL, IA, SD, WY, and WA.
Origin/Endemic status: Native
Syn: = F, FNA23, GrPl, Il, K1, K3, K4, Mi, NE, NY, Pa, WV; < Scirpus cyperinus – C, G