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. Inflorescences shorter than the petioles subtending them; leaves deeply serrate (teeth often twice as long as broad), with blades less than 4 cm long, ± obtuse; stipules less than 3 mm long; plant annual, a rare waif.

U. urens

1. Inflorescences exceeding the petioles; leaves with shorter teeth and usually larger blades, narrowly acute; stipules longer; plant perennial, widespread.

U. dioica

All species found in Urtica



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