Danthonia

1. Longest pedicels on lowest panicle branches 1.1–1.8 times as long as the spikelet (including awns); lower panicle branches spreading to reflexed at maturity.

D. compressa

1. Longest pedicels on lowest panicle branches 0.3–0.9 times as long as the spikelet; lower panicle branches ascending to erect at maturity.

2. Lemmas pilose only on margins and at base (on callus), usually 5 mm or more in length (including teeth but not awn); spikelets strongly purple or bronze in color.

D. intermedia

2. Lemmas at least sparsely pilose across the back, less than 5.5 mm long (very rarely 7 mm if teeth are as long as 2–3 mm); spikelets ± greenish or at most purplish at their tips.

D. spicata

All species found in Danthonia

Danthonia compressaFLAT OATGRASS 
Danthonia intermediaOATGRASS 
Danthonia spicataPOVERTY GRASS, OATGRASS 

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 11, 2017. http://www.michiganflora.net/genus.aspx?id=Danthonia.