Coefficient of Conservatism:
Coefficient of Wetness:
A. A. Reznicek
Included in S. cyperinus in Michigan Flora.
Meadows, around pools and swampy clearings in forests, openings in swamps.
Paler and also larger than S. atrocinctus, though similar in having the spikelets mostly pediceled, this is a poorly understood entity known from a few scattered localities, though perhaps overlooked. This species matures relatively early (inflorescences expanded by mid to late July) and even at maturity has greenish, grey-green, or pale brown spikelets, lacking the blackish tint of S. atrocinctus.
Two specimens from southernmost Michigan that will key here because of their pedicellate spikelets differ in having conspicuously reddish-brown scales and being late maturing (September); they are apparently the large southern variant of S. cyperinus formerly segregated as S. rubricosus Fern.