Rosa acicularis Lindl.
Common Name: WILD ROSE
Coefficient of Conservatism: 4
Coefficient of Wetness: 3
Wetness Index: FACU
Physiognomy: Nt Shrub

Sandy and gravelly shores and dunes; rocky ridges, outcrops, and shores; dry sandy savannas with jack pine and oak; moist thickets and openings in coniferous forests and swamps.

This is a circumpolar species, the only one of our native roses that is also indigenous in the Old World; it has the largest total range of any species in the genus. Rosa acicularis is Eurasian, ranging into Alaska, and is octoploid (2n = 56). The American populations are hexaploid (2n = 42) and differ in various morphological tendencies; they may be called subsp. sayi (Schwein.) W. H. Lewis or var. bourgeauana Crép.

This species sometimes hybridizes with the diploid R. blanda; the tetraploid progeny are partly sterile.

Locations

Alcona County
Alger County
Alpena County
Antrim County
Baraga County
Berrien County
Charlevoix County
    Only on Beaver Island
Cheboygan County
Chippewa County
    Including Drummond Island
Delta County
Emmet County
Grand Traverse County
Houghton County
Iosco County
Iron County
Kalkaska County
Keweenaw County
    Including Isle Royale
Leelanau County
    Including Manitou Islands
Mackinac County
    Including Bois Blanc, Mackinac, Round Islands
Marquette County
Menominee County
Montmorency County
Muskegon County
Ontonagon County
Oscoda County
Ottawa County
Presque Isle County
Schoolcraft County

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 17, 2017. http://michiganflora.net/species.aspx?id=2535.