1. Awn 6–9 mm long, ± twisted; glumes perfectly smooth.
P. canadensis
1. Awn absent or less than 2 (–3) mm long, nearly straight; glumes very minutely scabrous towards apex [20×].
P. pungens
All species found in Piptatheropsis
Citation:
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. May 25, 2018. https://michiganflora.net/genus.aspx?id=Piptatheropsis.