In both species, the achenes may have whitish encrustations or papillae, or may simply be smooth but for delicate horizontal striations.
1. Scales glabrous; style 3-cleft, glabrous; achenes 3-sided, ca. 0.4–0.7 mm long; anthers ca. 0.3 mm long; plant a delicate tufted annual.
1. Scales finely pubescent, at least distally; style 2-cleft, ciliate below; achenes biconvex, ca. 1–1.4 mm long; anthers 1.5–1.7 mm long; plant a hard-based, stiff perennial.
All species found in Fimbristylis
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. July 11, 2020. https://michiganflora.net/genus.aspx?id=Fimbristylis.