Spiraea alba Du Roi
Common Name: MEADOWSWEET
Coefficient of Conservatism: 4
Coefficient of Wetness: -3
Wetness Index: FACW
Physiognomy: Nt Shrub

Wet shores, marshes, sedge meadows, tamarack swamps, peatlands, edges of streams, interdunal swales; moist borders of forests and shallow soil over rock; when occurring in apparently dry places they are often periodically flooded.

There are two thoroughly intergrading varieties; one of them, primarily eastern in range, is often recognized as a distinct species, S. latifolia (Aiton) Borkh. The more midwestern var. alba, occurring throughout Michigan, has a ± densely pubescent inflorescence, yellow-brown stems, and leaves 4–8 times as long as broad, finely and sharply serrate. In var. latifolia (Aiton) Dippel, the inflorescence is glabrous or nearly so, the stem red- to purple-brown, and the leaves are less than 3 times as long as broad, coarsely and bluntly serrate. The few specimens that appear to be var. latifolia are all from the northeastern Lower Peninsula and the Upper Peninsula. The apparently mostly subalpine and alpine var. septentrionalis (Fernald) F. Seym. (sometimes recognized as S. septentrionalis (Fernald) Á. Löve & D. Löve) has been reported from the Keweenaw Peninsula, but we have not seen the specimen.

Locations

Alcona County
Alger County
Allegan County
Alpena County
Antrim County
Arenac County
Baraga County
Barry County
Bay County
Benzie County
Berrien County
Branch County
Calhoun County
Cass County
Charlevoix County
Cheboygan County
Chippewa County
    Including Drummond Island
Clare County
Clinton County
Crawford County
Delta County
Dickinson County
Emmet County
Genesee County
Gladwin County
Gogebic County
Grand Traverse County
Gratiot County
Hillsdale County
Houghton County
Huron County
Ingham County
Ionia County
Iosco County
Iron County
Isabella County
Jackson County
Kalamazoo County
Kalkaska County
Kent County
Keweenaw County
    Including Isle Royale
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
Missaukee County
Monroe County
Montcalm County
Muskegon County
Newaygo County
Oakland County
Oceana County
Ogemaw County
Ontonagon County
Osceola County
Oscoda County
Otsego County
Ottawa County
Presque Isle County
Roscommon County
Saginaw 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 16, 2017. http://michiganflora.net/species.aspx?id=2572.