Viola adunca Sm.
Common Name: SAND VIOLET
Coefficient of Conservatism: 4
Coefficient of Wetness: 3
Wetness Index: FACU
Physiognomy: Nt P-Forb

Viola adunca A. A. Reznicek

Dry sandy open ground (plains, barren spots, ridges, banks), often with jack pine and oaks; crevices in rock outcrops on both summits and shores in the Lake Superior region.

The fresh leaves are darker (more of a blue-green) than in V. labradorica, and thicker in texture. Their shape is more easily used to distinguish the two species than it is to describe. In the jack pine plains and elsewhere in the Lower Peninsula, plants nearly always show at least some minute pubescence on peduncle, petioles, and blades (at least on the main veins and margins). Glabrous plants are found in the Lake Superior region. Apparent hybrids with V. labradorica are known from Alpena Co. and Bois Blanc Island (Mackinac Co.), and perhaps elsewhere.


Alcona County
Alger County
Alpena County
Baraga County
Benzie County
Charlevoix County
    Only on Beaver Island
Cheboygan County
Chippewa County
Crawford County
Delta County
Dickinson County
Emmet County
Gogebic County
Grand Traverse County
Houghton County
Huron County
Iosco County
Iron County
Isabella County
Kalkaska County
Kent County
Keweenaw County
    Including Isle Royale
Lake County
Leelanau County
    Including Fox Islands
    Including Manitou Islands
Luce County
Manistee County
Marquette County
Mason County
Menominee County
Midland County
Montmorency County
Muskegon County
Newaygo County
Oceana County
Ogemaw County
Ontonagon County
Osceola County
Oscoda County
Otsego County
Presque Isle County
Roscommon County
Schoolcraft County
St. Clair County


MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. October 6, 2022.