Please try our next iteration of the Michigan Flora Online here. Beginning on February 1, 2023, michiganflora.net 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.

Cirsium discolor (Willd.) Spreng.
Common Name: PASTURE THISTLE
Coefficient of Conservatism: 4
Coefficient of Wetness: 5
Wetness Index: UPL
Physiognomy: Nt B-Forb

Meadows, fields, clearings, hillsides, river banks, sparsely forested sites; roadsides, vacant lots, pine plantations; doubtless originally in prairie openings.

This species is very similar to C. altissimum. The heads of C. discolor run a little larger (involucre ca. 2.4–3.3 cm long in our material, compared with 2–2.7 cm in C. altissimum), but precise measurements are hard to determine. The white-flowered form [f. albiflorum (Britton) House] has been collected in Calhoun, Lenawee, Oakland, and Washtenaw Cos.

Locations

Bay County
Berrien County
Branch County
Calhoun County
Cass County
Emmet County
Genesee County
Grand Traverse County
Hillsdale County
Jackson County
Kalamazoo County
Kent County
Lake County
Lenawee County
Livingston County
Macomb County
Mecosta County
Menominee County
Midland County
Monroe County
Newaygo County
Oakland County
St. Clair County
Tuscola County
Washtenaw County
Wayne County

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. January 29, 2023. https://michiganflora.net/species.aspx?id=285.