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.

Carduus acanthoides L.
Coefficient of Conservatism: *
Coefficient of Wetness: 5
Wetness Index: UPL
Physiognomy: Ad B-Forb

Carduus acanthoides A. A. Reznicek

Roadsides, railroads, fields, farmyards, and other disturbed sites. First collected in 1920 in Washtenaw Co.

In areas of the Great Lakes region where both this and C. nutans are common and regularly co-occur, hybrids (C. ×orthocephalus Wallr.) are regular. These have not yet been seen in Michigan, but doubtless will be found in time.

The curly septate hairs along the veins of the underside of the leaf in this species are straight when fresh, though still visibly septate. The curling delelops on drying and is a herbarium feature.



Antrim County
Arenac County
Charlevoix County
    Only on Beaver Island
Cheboygan County
Emmet County
Kalamazoo County
Lenawee County
Mackinac County
Montmorency County
Oakland County
Washtenaw County
Wayne County


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