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 annuus L.
Coefficient of Conservatism: *
Coefficient of Wetness: 3
Wetness Index: FACU
Physiognomy: Ad A-Forb

Helianthus annuus habit A. A. Reznicek habit

Along railroads and roadsides; in dry fields and on river banks; shores (even among driftwood on Lake Superior); refuse heaps and other disturbed places. Presumably native to western North America, but long cultivated and early introduced to Europe. First collected in 1891 in Washtenaw Co.

Well known as a garden ornamental and also as a crop plant for the oil from its seeds, which are also popular in themselves as nutritious food for humans, birds, and other creatures. Hence, the species frequently escapes from cultivation as a weed. Such escapes are frequently depauperate.


Alger County
Allegan County
Alpena County
Benzie County
Berrien County
Cheboygan County
Chippewa County
Delta County
Emmet County
Gratiot County
Hillsdale County
Houghton County
Iosco County
Isabella County
Kalamazoo County
Kent County
Lapeer County
Leelanau County
Lenawee County
Livingston County
Mackinac County
Macomb County
Marquette County
Monroe County
Montcalm County
Oakland County
Ogemaw County
Ontonagon County
Otsego County
Ottawa County
Presque Isle County
Schoolcraft 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 30, 2023.