Rosa palustris Marshall
Common Name: SWAMP ROSE
Coefficient of Conservatism: 5
Coefficient of Wetness: -5
Wetness Index: OBL
Physiognomy: Nt Shrub

Rosa palustris flower G. E. Crow flower

Bogs, wet conifer swamps, wet thickets, and swales; margins of ponds, lakes, and streams.

Usually easily recognized by its wet habitat, curved infranodal prickles, and very finely and evenly serrate margins of the leaflets (ca. 20 or more teeth on a side of the larger leaflets). The flowers are very fragrant. The sepals (as in R. carolina and R. arkansana among our native roses) are often ± pinnately lobed, as in most of our garden species. In R. blanda and R. acicularis, only very rarely is there a hint of such lobing.

Rosa palustris f. inermis (Regel) W. H. Lewis lacks the characteristic stout curved infranodal prickles. Such plants can be recognized by the leaf margins and glandular-hispid hypanthium. Hybrids with R. blanda are discussed under that species.

Locations

Alger County
Allegan County
Antrim County
Baraga County
Barry County
Bay County
Benzie County
Berrien County
Branch County
Calhoun County
Cass County
Charlevoix County
    Including Beaver Island
Cheboygan County
Chippewa County
Clare County
Clinton County
Delta County
Eaton County
Emmet County
Genesee County
Gogebic County
Grand Traverse County
Gratiot County
Hillsdale County
Houghton County
Huron County
Ingham County
Ionia County
Jackson County
Kalamazoo County
Kalkaska County
Kent County
Keweenaw County
Lake County
Lapeer County
Leelanau County
    Including Manitou Islands
Lenawee 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
Newaygo County
Oakland County
Oceana County
Ogemaw County
Ontonagon County
Otsego County
Ottawa County
Presque Isle County
Roscommon County
Sanilac County
Schoolcraft County
Shiawassee County
St. Clair County
St. Joseph County
Tuscola County
Van Buren County
Washtenaw County
Wayne County
Wexford County

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 11, 2017. http://www.michiganflora.net/species.aspx?id=2544.