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Avena

1. Lemmas with a stout, strongly twisted awn and often with stiff hairs on the back; florets falling from the spikelet by a distinct oval disarticulation surface.

A. fatua

1. Lemmas with the awn usually straight, weak, or absent, and the back glabrous; florets falling by fracture of rachilla at base of spikelet.

A. sativa

All species found in Avena

Avena fatuaWILD OATS 
Avena sativaOATS 

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. August 17, 2017. http://michiganflora.net/genus.aspx?id=Avena.