Diarrhena obovata (Gleason) Brandenburg
Common Name: BEAK GRASS
Synonym: Diarrhena americana
Coefficient of Conservatism: 9
Coefficient of Wetness: -3
Wetness Index: FACW
Physiognomy: Nt P-Grass
Status: T

D. americana of Michigan Flora.

Floodplain swamps, wooded river banks; local but sometimes abundant where present.

The uppermost florets in each spikelet are sterile. The firm leathery lemma and palea are widely spread at maturity by the conspicuous, bilaterally symmetrical swollen fruit.

This is a distinctive, attractive grass, with glossy foliage, forming large patches where abundant. It is readily recognized even vegetatively when one becomes familiar with its growth form.


Allegan County
Barry County
Berrien County
Clinton County
Eaton County
Genesee County
Hillsdale County
Ingham County
Ionia County
Kalamazoo County
Kent County
Lenawee County
Midland County
Monroe County
Ottawa County
Shiawassee County
Wayne County


MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. August 19, 2022. https://michiganflora.net/species.aspx?id=2066.