Symphyotrichum urophyllum (DC.) G. L. Nesom
Common Name: ARROW-LEAVED ASTER
Synonym: Aster sagittifolius
Coefficient of Conservatism: 2
Coefficient of Wetness: 5
Wetness Index: UPL
Physiognomy: Nt P-Forb

Aster sagittifolius of Michigan Flora.

Dry open sandy (sometimes rocky) savannas, with oak, sassafras, aspen, and/or pine (especially jack pine); forested banks and hillsides; stabilized dunes; fields, grassy roadsides, fencerows; rarely in wet areas.

Most specimens can be readily placed by the short white rays, attenuate phyllaries, and conspicuously winged petioles. Rarely a plant will have the leaf blades as strongly toothed and cordate as in S. cordifolium, but even on these the blades tend to be decurrent into broad wings on the petiole. In all but unusually shaded or otherwise depauperate individuals, the inflorescence has a characteristic pyramidal shape (or diamond-shaped outline). The disk corollas, as in S. cordifolium and S. ciliolatum, turn purple with age, but only rarely are the rays pink or blue (a result of hybridization?).

Locations

Alcona County
Allegan County
Alpena County
Antrim County
Arenac County
Barry County
Benzie County
Berrien County
Calhoun County
Cass County
Cheboygan County
Clare County
Clinton County
Crawford County
Eaton County
Emmet County
Gogebic County
Grand Traverse County
Gratiot County
Hillsdale County
Houghton County
Ingham County
Ionia County
Isabella County
Jackson County
Kalamazoo County
Kalkaska County
Kent County
Lake County
Leelanau County
Lenawee County
Livingston County
Mackinac County
Macomb County
Manistee County
Marquette County
Mason County
Mecosta County
Menominee County
Missaukee County
Monroe County
Montcalm County
Montmorency County
Newaygo County
Oakland County
Oceana County
Ogemaw County
Osceola County
Oscoda County
Ottawa County
Presque Isle County
Roscommon County
St. Clair County
St. Joseph County
Washtenaw County
Wayne 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=497.