Helianthus maximiliani Schrad.
Common Name: MAXIMILIAN SUNFLOWER
Coefficient of Conservatism: *
Coefficient of Wetness: 5
Wetness Index: UPL
Physiognomy: Ad P-Forb

Helianthus maximiliani B. S. Walters

Roadsides, railroads, fields; jack pine, oak, and aspen savannas. Like so many of our sunflowers, the native range is obscure, but this is likely adventive from farther west (or escaped from gardens, as it is a showy species). Our earliest collections are from along railroads and none were made before 1898 when collected in Muskegon and Washtenaw Cos.

This is a fairly easily recognized species, especially if the typically folded (and arcuate) leaves are present. The upper part of the stem (or peduncles) usually has evident dense white pubescence, but such can also be seen in some plants of H. giganteus, which may also have nearly entire leaves (though not folded or arched). The habitat may help to separate these two; H. maximiliani is always in dry, open sites, and H. giganteus frequently in wetter sites. The rays in our specimens run 1.7–3.3 cm long; they are reported longer elsewhere. On richer soils the plants may approach 3 m in height, but they are usually less, often much less, than a third that tall.

Locations

Alger County
Alpena County
Cass County
Cheboygan County
Crawford County
Delta County
Dickinson County
Emmet County
Gogebic County
Houghton County
Kalamazoo County
Kent County
Keweenaw County
    Including Isle Royale
Leelanau County
Lenawee County
Mackinac County
    Including Bois Blanc, Mackinac, Round Islands
Menominee County
Monroe County
Muskegon County
Oakland County
Schoolcraft County
St. Clair County
Washtenaw County
Wayne County

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 11, 2017. http://michiganflora.net/species.aspx?id=352.