Frangula alnus Mill.
Synonym: Rhamnus frangula
Coefficient of Conservatism: *
Coefficient of Wetness: 0
Wetness Index: FAC
Physiognomy: Ad Shrub

Frangula alnus B. S. Walters

Rhamnus frangula of Michigan Flora.

A Eurasian species, aggressive and becoming a major pest as a tall shrub in bogs, fens, and other wet habitats, including tamarack and cedar swamps (particularly in disturbed areas as along new power lines and other clearings), thickets along rivers, lake shores, ditches, fencerows; occasionally in drier sites. First collected in Michigan in 1934 in Delta Co., were ortiginally first planted.

Frequently cultivated, now mostly as fastigiate cultivars ('Columnaris') with normal foliage, but strongly ascending branches, and fern leaf cultivars ('Asplenifolia') with a normal growth habit but a very narrow leaf with an irregular, wavy margin. Occasionally, weedy occurrences will contain variants that suggest their origins from these cultivars.


Alpena County
Baraga County
Barry County
Benzie County
Berrien County
Calhoun County
Delta County
Emmet County
Genesee County
Grand Traverse County
Hillsdale County
Houghton County
Ingham County
Iron County
Jackson County
Kalamazoo County
Kent County
Leelanau County
Lenawee County
Livingston County
Mackinac County
    Only on Bois Blanc, Mackinac, Round Islands
Macomb County
Manistee County
Marquette County
Mason County
Mecosta County
Menominee County
Monroe County
Oakland County
Ontonagon County
Osceola County
Schoolcraft County
Van Buren County
Washtenaw County
Wayne County


MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. June 29, 2022.