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Piptatheropsis

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

Piptatheropsis canadensisCANADIAN RICE-GRASS 
Piptatheropsis pungensRICE-GRASS 

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. March 27, 2017. http://michiganflora.net/genus.aspx?id=Piptatheropsis.