1. Glumes mostly (3.5–) 4–5.7 mm long, the keel not winged; sterile lemmas very hairy, ca. 0.5–2 (–3) mm long; rhizomatous perennial, with elongate lobed panicle (or the lower branches spreading at anthesis).
1. Glumes mostly 6–8 mm long, the keel prominently winged; sterile lemmas glabrous or nearly so, ca. 2.5–3.7 mm long; annual, with very dense, compact, ovoid panicle.
All species found in Phalaris
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. May 25, 2017. http://michiganflora.net/genus.aspx?id=Phalaris.