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.

Silphium laciniatum L.
Coefficient of Conservatism: 9
Coefficient of Wetness: 5
Wetness Index: UPL
Physiognomy: Nt P-Forb
Status: T

Like S. perfoliatum, native mostly to the south and west of Michigan. At least in part probably adventive along railroads (e.g., Jackson, St. Clair, Washtenaw, and Wayne Cos.), although railroad rights-of-way and depauperate prairies are indeed about all we have left of its proper habitat.

The common name refers to the tendency of the lower leaves to orient themselves vertically in a north-south direction when exposed to full sun (thus escaping the full radiation that a horizontal leaf would receive).


Berrien County
Cass County
Delta County
Jackson County
Kalamazoo County
Kent County
Lenawee County
Menominee County
St. Clair County
Washtenaw County
Wayne County


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