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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 


MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. March 24, 2018. http://www.michiganflora.net/genus.aspx?id=Avena.