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.


1. Leaflets 5–9, the terminal one distinctly larger than those of lowest pair; pith of year-old twigs continuous; staminate aments peduncled in groups of 3.


1. Leaflets (9–) 11–19, the terminal one usually about equal to those of lowest pair, or smaller; pith of year-old twigs becoming chambered (separating into thin plates and cavities); staminate aments sessile or nearly so.



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