Leymus

1. Spikelets usually 3–8 per node; lemmas clearly awned.

L. racemosus

1. Spikelets usually 2 per node; lemmas acute to acuminate.

2. Culms essentially glabrous at the summit; glumes glabrous or scabrous.

L. arenarius

2. Culms finely and densely pubescent at the summit; glumes hairy.

L. mollis

All species found in Leymus

Leymus arenariusLYME GRASS 
Leymus mollisAMERICAN DUNE GRASS 
Leymus racemosusRYE GRASS 

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. July 20, 2017. http://michiganflora.net/genus.aspx?id=Leymus.