Trillium grandiflorum (Michx.) Salisb.
Common Name: COMMON TRILLIUM

Coefficient of Conservatism: 5
Coefficient of Wetness: 3
Wetness Index: FACU
Physiognomy: Nt P-Forb

Moist to rather dry deciduous forests, most luxuriant and often forming large colonies in rich beech-maple forest, but also, less frequently, found in oak-hickory or aspen forests, swamps and thickets, mixed conifer-hardwoods, and even coniferous swamps. Apparently very local in Houghton and Keweenaw Cos. and Isle Royale—a single collection seen from each of these areas.

The petals tend to turn pink with age; in other species, the color, whether white, maroon, or intermediate, appears to be more constant from the bud to maturity.

Forms with the petals variegated with green are not uncommon and are sometimes locally abundant. In extreme cases, parts of the flower are sometimes changed toward more leaf-like states, and are sometimes multiplied in number. Petioled leaves often occur on plants with abnormal flowers. Most of these variants result from a phytoplasma infection; the disease spreads and plants die after several years.

Locations

Alcona County
Alger County
Allegan County
Alpena County
Antrim County
Arenac County
Baraga County
Barry County
Bay County
Benzie County
Berrien County
Branch County
Calhoun County
Cass County
Charlevoix County
    Including Beaver Island
Cheboygan County
Chippewa County
    Including Drummond Island
Clare County
Clinton County
Crawford County
Delta County
Dickinson County
Eaton County
Emmet County
Genesee County
Gladwin County
Gogebic County
Grand Traverse County
Gratiot County
Hillsdale County
Houghton County
Huron County
Ingham County
Ionia County
Iosco County
Iron County
Isabella County
Jackson County
Kalamazoo County
Kalkaska County
Kent County
Keweenaw County
    Including Isle Royale
Lake County
Lapeer County
Leelanau County
    Including Fox Islands
    Including Manitou Islands
Lenawee County
Livingston County
Luce County
Mackinac County
    Including Bois Blanc, Mackinac, Round Islands
Macomb County
Manistee County
Marquette County
Mason County
Mecosta County
Menominee County
Midland County
Missaukee County
Monroe County
Montcalm County
Montmorency County
Muskegon County
Newaygo County
Oakland County
Oceana County
Ogemaw County
Ontonagon County
Osceola County
Oscoda County
Otsego County
Ottawa County
Presque Isle County
Roscommon County
Saginaw County
Sanilac County
Schoolcraft County
Shiawassee County
St. Clair County
St. Joseph County
Tuscola County
Van Buren County
Washtenaw County
Wayne County
Wexford County

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. July 28, 2014. http://michiganflora.net/species.aspx?id=2732.