Prunus nigra Aiton
Common Name: CANADA PLUM
Coefficient of Conservatism: 4
Coefficient of Wetness: 3
Wetness Index: FACU
Physiognomy: Nt Tree

Prunus nigra A. A. Reznicek

Hardwoods and borders of forests, especially on banks along rivers and streams; thickets and fencerows.

Sometimes confused with P. americana, but rather easily distinguished not only by the glandular margins on the leaves and calyx but also by the tendency for the flowers to be pale pink (or to become pink in age) and the conspicuous glands toward the summit of the petiole (in P. americana the glands are generally on the lower margin of the blade). The upper surfaces of the calyx lobes are rather densely pubescent in P. americana, while in P. nigra the pubescence is restricted to the very base of the lobes or is sometimes completely absent. In our specimens of P. americana (and also P. umbellata) the petioles are ± densely pubescent above, while in P. nigra they are almost always sparsely pubescent or glabrous. When P. nigra and P. americana grow together, the former is reported to bloom about a week earlier.

Locations

Baraga County
Charlevoix County
    Including Beaver Island
Cheboygan County
Chippewa County
Emmet County
Genesee County
Gladwin County
Gogebic County
Gratiot County
Houghton County
Huron County
Ingham County
Isabella County
Kalamazoo County
Kent County
Lake County
Lenawee County
Livingston County
Mackinac County
Mecosta County
Montmorency County
Ontonagon County
Ottawa County
Saginaw County
Shiawassee County
St. Clair 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 10, 2017. http://www.michiganflora.net/species.aspx?id=2523.