Prenanthes racemosa Michx.
Common Name: GLAUCOUS WHITE LETTUCE
Coefficient of Conservatism: 8
Coefficient of Wetness: -3
Wetness Index: FACW
Physiognomy: Nt P-Forb

Calcareous sandy or rocky shores and interdunal flats, including conifer thickets on them; fens, wet prairies, moist hollows; rock crevices on Lake Superior.

An easily recognized, rather glaucous plant with clasping leaf bases and an elongate, cylindrical, hairy inflorescence that strongly nods when in bud but becomes erect as the heads open. The stem and leaves below the inflorescence are glabrous.

Prenanthes aspera Michx., an uncommon species, reported from northern Indiana, may some day be found in southern Michigan. It has the stem and cauline leaves ± rough-hairy, but otherwise resembles P. racemosa.

Locations

Alpena County
Barry County
Bay County
Berrien County
Cass County
Cheboygan County
Chippewa County
    Including Drummond Island
Clinton County
Emmet County
Hillsdale County
Huron County
Ingham County
Jackson County
Kalamazoo County
Kent County
Keweenaw County
    Including Isle Royale
Lenawee County
Livingston County
Luce County
Mackinac County
    Including Bois Blanc, Mackinac, Round Islands
Macomb County
Midland County
Monroe County
Oakland County
Presque Isle County
Schoolcraft County
St. Clair County
St. Joseph County
Van Buren County
Washtenaw County

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 17, 2017. http://www.michiganflora.net/species.aspx?id=429.