Rhododendron groenlandicum (Oeder) Kron & Judd
Common Name: LABRADOR-TEA
Synonym: Ledum groenlandicum
Coefficient of Conservatism: 8
Coefficient of Wetness: -5
Wetness Index: OBL
Physiognomy: Nt Shrub

Ledum groenlandicum of Michigan Flora.

Typically in bogs and conifer swamps, but more widespread northward, in interdunal swales, in mossy conifer forests, on shaded sandy bluffs along Lake Superior, in rock crevices on Isle Royale.

The leaves have long been used to make a tea, in the Great Lakes region as well as elsewhere. Usually reaches the peak of blooming around early to mid-June, later than Kalmia polifolia, with which it often grows; close to Lake Superior, as on Whitefish Point, flowering may peak around the first of July in late seasons and it is a truly glorious sight to see the two species blooming together in great masses. The woolly pubescence on the undersides of the leaves is white when young but turns rusty brown by the second year on the evergreen leaves (or on herbarium specimens). The style persists on the capsule, which is narrowly elliptic and splits from the base along 5 sutures. See Kron & Judd (1990) for a discussion of the generic placement.

Locations

Alcona County
Alger County
Alpena County
Antrim County
Arenac County
Baraga County
Benzie County
Charlevoix County
    Including Beaver Island
Cheboygan County
Chippewa County
    Including Drummond Island
Clare County
Crawford County
Delta County
Dickinson County
Emmet County
Gladwin County
Gogebic County
Grand Traverse County
Houghton County
Ingham County
Iosco County
Iron County
Kalkaska County
Keweenaw County
    Including Isle Royale
Lapeer County
Leelanau County
Luce County
Mackinac County
    Including Bois Blanc, Mackinac, Round Islands
Marquette County
Menominee County
Missaukee County
Montmorency County
Oakland County
Ogemaw County
Ontonagon County
Oscoda County
Otsego County
Presque Isle County
Roscommon County
Sanilac County
Schoolcraft County
Wexford County

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 15, 2017. http://www.michiganflora.net/species.aspx?id=1220.