Hypericum majus (A. Gray) Britton
Common Name: LARGER CANADA ST. JOHN'S-WORT
Coefficient of Conservatism: 4
Coefficient of Wetness: -3
Wetness Index: FACW
Physiognomy: Nt P-Forb

Moist sandy to mucky (or marly) shores, excavations, interdunal hollows; marshy or sedgy ground; borders of streams and cedar swamps; crevices in sandstone.

This species is distinctive when it has (ovate-) lanceolate 5-nerved leaves, but tends to run close to H. canadense, with which it is alleged to hybridize. Except for some depauperate individuals, only one truly intermediate specimen has been encountered, with short sepals (even in fruit) but leaves up to 5-nerved (C. A. Davis in 1905, Dickinson Co., MICH). Both these species also reportedly hybridize with H. mutilum.

Locations

Alger County
Allegan County
Alpena County
Arenac County
Baraga County
Benzie County
Berrien County
Branch County
Calhoun County
Cass County
Charlevoix County
    Only on Beaver Island
Cheboygan County
Chippewa County
Clare County
Crawford County
Delta County
Dickinson County
Emmet County
Genesee County
Gladwin County
Gogebic County
Grand Traverse 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
Leelanau County
    Including Manitou Islands
Lenawee County
Livingston County
Luce County
Mackinac County
Macomb County
Manistee County
Marquette County
Mason County
Mecosta County
Menominee County
Midland County
Missaukee County
Monroe County
Muskegon County
Newaygo County
Oakland County
Oceana County
Otsego County
Ottawa County
Presque Isle County
Roscommon County
Saginaw County
Schoolcraft County
St. Clair County
Tuscola County
Van Buren 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 18, 2017. http://michiganflora.net/species.aspx?id=1463.