Coefficient of Conservatism:
Coefficient of Wetness:
Included in S. cyperinus in Michigan Flora.
Wet meadows, bogs, lake shores and stream banks, ditches, wet shrub thickets, openings in swamps, rock crevices along Lake Superior. The Scirpus cyperinus complex, including in Michigan this species, S. cyperinus, and S. pedicellatus, is often regarded as one highly variable species. Distinguishing the species can be difficult and some specimens appear intermediate and may be hybrids. Collectively they prefer acidic sites and sandy soils, less commonly occurring in fens or other more calcareous habitats.
Scirpus atrocinctus is a common, slender species, frequent in northern Michigan. Distinctly earlier blooming and fruiting than the other two species of the S. cyperinus complex, often with inflorescences fully expanded by late June, even in the Upper Peninsula, and achenes ripe by late July.