Phalaris might be keyed here if not recognized as belonging to Group 6. It is a genus of tall, erect plants with membranous ligules, in contrast to the nearly prostrate Crypsis, with ligule of hairs. The small scales or tiny hairy flaps representing the lemmas of reduced lateral florets at the base of the bisexual floret in the spikelet of Phalaris are absolutely distinctive.
All species found in Crypsis
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=Crypsis.