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. Leaves lacking a single prominent raised midvein, but with 2–several clearly separate veins of ± equal strength along with numerous fainter veins, the leaf thus not obviously ridged to the naked eye; fruit maturing.

A. americanus

1. Leaves with a single prominent raised midvein (best observed at about 1/2 to 2/3 of the length of the leaf) that is much more conspicuous than any other veins, appearing as a ridge to the naked eye; fruits not maturing.

A. calamus

All species found in Acorus

Acorus americanusSWEET-FLAG 
Acorus calamusSWEET-FLAG, CALAMUS 


MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. February 1, 2023.