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1. Ligule an erose membrane ca. 0.5–1 mm long; spikelets 1.7–2.2 mm long.

C. rigidula

1. Ligule entirely or mostly a fringe of hairs ca. 1.2–2.5 mm long; longer spikelets 2–2.8 mm long.

C. longifolia

All species found in Coleataenia

Coleataenia longifoliaLONG-LEAVED PANIC GRASS 
Coleataenia rigidulaPANIC GRASS 


MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. September 25, 2022. https://michiganflora.net/genus.aspx?id=Coleataenia.