Cinna

1. Spikelets (4.2–) 4.5–6.5 mm long, the second glume rather dull, with a well-developed lateral nerve on each side; anther 0.8–1.8 mm long.

C. arundinacea

1. Spikelets 2.5–3.8 (–4) mm long (excluding awn), the second (longer) glume glistening and with lateral nerves very obscure or virtually absent; anther 0.4–0.9 mm long.

C. latifolia

All species found in Cinna

Cinna arundinaceaWOOD REEDGRASS 
Cinna latifoliaWOOD REEDGRASS 

Citation:

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=Cinna.