Please try our next iteration of the Michigan Flora Online here. Beginning on February 1, 2023, will point to this new site.

The new site offers several benefits over the existing website, including real coordinate mapping, giving a clearer view of the density of documentation as well as more precision about plant distributions and their link to landforms. We will also have the ability to update species pages more regularly, both in terms of new collections and as more existing Michigan specimens are georeferenced. In addition, we have a better photo display, and offer indented keys.

Elymus macgregorii R. E. Brooks & J. J. N. Campb.
Common Name: WILD RYE
Synonym: Elymus virginicus
Coefficient of Conservatism: 6
Coefficient of Wetness: 0
Wetness Index: FAC
Physiognomy: Nt P-Grass

Elymus macgregorii A. A. Reznicek

Rich forests and forest openings, especially along streams. First collected in Lenawee Co. by R. W. Smith in 1986; perhaps this recently described species is overlooked in similar sites in southernmost Michigan.

A recently described species formerly included with E. virginicus; this flowers and fruits slightly earlier than E. virginicus, and has the inflorescence more exserted from the sheath. The rare hybrids of E. virginicus and E. hystrix may resemble E. macgregorii, but differ in their narrower glumes.

Elymus glabriflorus occurs in northern Indiana, and might be found in southwestern Michigan. It resembles E. macgregorii in the broad inflorescence with long awns, but has more densely flowered inflorescences, the internodes on the rachis less than 5 mm long, making for a dense, bushy aspect.


Berrien County
Kent County
Lenawee County
Ottawa County
St. Joseph County
Washtenaw County


MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. January 29, 2023.