Silybum marianum (L.) Gaertn.
Common Name: MILK-THISTLE, BLESSED THISTLE
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.

Locations

Cheboygan County
Kent County
St. Clair County

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 13, 2017. http://michiganflora.net/species.aspx?id=449.