Included in Scirpus in Michigan Flora.
1. Styles 3-cleft; achenes distinctly 3-angled, 4–5 mm long; involucres mostly with 3–5 well-developed bracts; perianth bristles strong, distinctly retrorse-barbed.
1. Styles 2-cleft; achenes biconvex, 3–4 mm long; involucre with 2 well-developed bracts; perianth bristles weak, scarcely half as long as achene, obscurely barbed.
All species found in Bolboschoenus
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. June 25, 2018. https://www.michiganflora.net/genus.aspx?id=Bolboschoenus.