Apocynum androsaemifolium L.
Common Name: SPREADING DOGBANE
Coefficient of Conservatism: 3
Coefficient of Wetness: 5
Wetness Index: UPL
Physiognomy: Nt P-Forb

Dry sandy or rocky open forests and savannas with such associates as oak, hickory, pine, aspen, sassafras, bracken, sweet-fern; does well after disturbance such as fire or logging, and characteristic of clearings, old fields, shores, roadsides, railroads, fencerows and borders of forests, occasionally sandy prairies.

Variable in several characters, including pubescence and shape of sepals. The mature corolla usually runs about 3 times as long as the calyx, although it is relatively shorter in plants with unusually long narrow calyx lobes. The flowers at maturity are ± pendent or spreading, and in well-developed plants occur in both terminal and axillary cymes.

Plants intermediate with A. cannabinum in corolla length and color, leaf shape and aspect, flower position, and field appearance are presumably hybrids (A. ×floribundum Greene). Other intermediate plants combine small flowers (as in A. cannabinum) with spreading habit and axillary cymes (as in A. androsaemifolium). Some introgression with the parent species doubtless occurs, making herbarium specimens of the hybrid especially difficult to recognize.

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
    Including Beaver Island
Cheboygan County
Chippewa County
    Including Drummond Island
Clare County
Clinton County
Crawford County
Delta County
Dickinson County
Eaton County
Emmet County
Genesee County
Gladwin County
Gogebic County
Grand Traverse County
Gratiot County
Hillsdale County
Houghton County
Huron County
Ingham 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 Fox Islands
    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
Montmorency County
Muskegon County
Newaygo County
Oakland County
Oceana County
Ogemaw County
Ontonagon 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 18, 2017. http://www.michiganflora.net/species.aspx?id=152.