Pyrola americana Sweet
Common Name: ROUND-LEAVED PYROLA
Synonym: Pyrola rotundifolia
Coefficient of Conservatism: 7
Coefficient of Wetness: 0
Wetness Index: FAC
Physiognomy: Nt P-Forb

Pyrola americana R. W. Smith

P. rotundifolia of Michigan Flora.

Usually associated with deciduous trees in the southern part of the state, but northward often under red and jack pine, or even in cedar swamps and peatlands (fens).

Pyrola americana usually reaches the peak of blooming in the second or third week of July in our area (sometimes as early as the end of June in southern Michigan); it is our latest-blooming species of the genus, with flowers sometimes lingering on until September near Lake Superior.

The large bracts in the inflorescence will readily distinguish this species from P. elliptica, also white-flowered, should there be doubt on other characters. The status of this species is still in doubt. Though now generally considered distinct from the Eurasian P. rotundifolia, some authors treat it as P. asarifolia subsp. americana (Sweet) Křísa.

Locations

Alcona County
Alger County
Allegan County
Alpena County
Antrim County
Baraga County
Benzie County
Berrien County
Cass County
Charlevoix County
Cheboygan County
Chippewa County
Delta County
Dickinson County
Emmet County
Genesee County
Grand Traverse County
Gratiot County
Hillsdale County
Houghton County
Ingham County
Iosco County
Jackson County
Kalamazoo County
Kent County
Keweenaw County
Lake County
Lapeer County
Leelanau 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
Monroe County
Montcalm County
Muskegon County
Oakland County
Oceana County
Ogemaw County
Oscoda 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 13, 2017. http://michiganflora.net/species.aspx?id=1230.