Platanthera huronensis (Nutt.) Lindl.
Common Name: LAKE HURON GREEN ORCHID
Synonym: Habenaria hyperborea
Coefficient of Conservatism: 5
Coefficient of Wetness: -3
Wetness Index: FACW
Physiognomy: Nt P-Forb

Fens, open cedar swamps, openings in wet coniferous, deciduous, and mixed forests, sedge meadows, lake shores and river banks.

Platanthera huronensis flowers have a sweet fragrance, in contrast to those of P. aquilonis, which are essentially scentless, and the lip of P. huronensis is paler, often a greenish-white, while the lip of P. aquilonis is greenish yellow. However, the two are quite difficult to distinguish with dried specimens. Though variable in size, P. huronensis can be stouter and taller than P. aquilonis, with plants to 1 m tall with leaves to 6 cm broad occurring in vigorous clumps in sedge meadows and peaty swales along the northern shores of Lakes Michigan and Huron. No specimens of P. aquilonis in MICH are larger than 60 cm tall with leaves to 3.7 cm wide. Catling & Catling (1997) suggest that the polyploid P. huronensis is derived from a hybrid of P. dilatata and P. aquilonis (as P. hyperborea). See Sheviak (1999), Wallace (2003), and Sears (2008) for further information.

Locations

Alcona County
Alger County
Allegan County
Antrim County
Baraga County
Benzie County
Charlevoix County
    Including Beaver Island
Cheboygan County
Chippewa County
Clare County
Crawford County
Delta County
Dickinson County
Emmet County
Gogebic County
Grand Traverse County
Gratiot County
Houghton County
Iosco County
Iron County
Jackson County
Kalkaska County
Keweenaw County
    Including Isle Royale
Leelanau County
    Only on Fox Islands
    Including Manitou Islands
Lenawee County
Luce County
Mackinac County
    Including Bois Blanc, Mackinac, Round Islands
Marquette County
Montmorency County
Oakland County
Ogemaw County
Oscoda County
Otsego County
Presque Isle County
Roscommon County
Schoolcraft County
St. Clair County
Washtenaw County

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 14, 2017. http://www.michiganflora.net/species.aspx?id=1831.