Other Michigan species previously included in Oryzopsis are segregated into Piptatherum; Oryzopsis is now monotypic.
All species found in Oryzopsis
Citation:
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 19, 2018. https://michiganflora.net/genus.aspx?id=Oryzopsis.