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.

Helianthus occidentalis Riddell
Coefficient of Conservatism: 8
Coefficient of Wetness: 3
Wetness Index: FACU
Physiognomy: Nt P-Forb

Helianthus occidentalis B. S. Walters

Despite the name, this sunflower ranges less far west than many, and is in fact concentrated in Michigan and Wisconsin, less common southward. It is characteristic of our dry, very open, usually sandy savannas, such as jack pine and oak plains. It has also spread along railroads and in fields, and is found in dry prairies.

This is a very easily recognized species with the few leaves concentrated at the base of the plant, nearly naked stem, and colonial habit resulting from slender, shallow, pale rhizomes, which usually produce an abundance of leaf rosettes in a colony.


Alcona County
Allegan County
Arenac County
Barry County
Berrien County
Branch County
Calhoun County
Cass County
Cheboygan County
Clare County
Crawford County
Genesee County
Hillsdale County
Ionia County
Iosco County
Jackson County
Kalamazoo County
Kent County
Lake County
Lenawee County
Livingston County
Macomb County
Mason County
Mecosta County
Menominee County
Montcalm County
Montmorency County
Muskegon County
Newaygo County
Oakland County
Oscoda County
Otsego County
Presque Isle County
Roscommon County
St. Joseph County
Van Buren 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.