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.

Silybum marianum (L.) Gaertn.
Coefficient of Conservatism: *
Coefficient of Wetness: 5
Wetness Index: UPL
Physiognomy: Ad B-Forb

Native to southern Europe, northern Africa, and the Near East, occasionally escaped from cultivation. First collected in 1890 in Cheboygan Co.

The large, auriculate, scarcely lobed leaves are spiny-margined, and the strikingly large phyllaries are spine-tipped besides having spiny margins on the expanded bases.


Cheboygan County
Kent County
St. Clair County


MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. January 30, 2023.