Juglans cinerea L.
Common Name: BUTTERNUT
Coefficient of Conservatism: 5
Coefficient of Wetness: 3
Wetness Index: FACU
Physiognomy: Nt Tree

Juglans cinerea mid-sized tree bark R. Schipper mid-sized tree bark

Stream banks and swamps, as well as upland beech-maple, oak-hickory, and mixed hardwood stands. The Alpena and Benzie Co. records, and probably also the North Manitou Island plants, are of individuals seeding in from planted trees,. At least some, if not all, of the Upper Peninsula records, however, appear to be of native trees.

There are some pubescence differences that will help to distinguish this species from the black walnut, even when the distinctive dark pith is not exposed. In J. cinerea, there is often a pad of dense small hairs extending transversely along the upper margin of the old leaf scars; in J. nigra, this pad is absent, although the circular area of bud pubescence is confusing, and some specimens are ambiguous. The underside of the leaflets in J. cinerea is covered with mostly stellate hairs, while in J. nigra the pubescence is sparser and mostly of simple hairs. The pubescence of J. cinerea, including that on the fruit, is stickier than that of J. nigra. Butternuts in Michigan are being decimated by Butternut canker (Sirococcus clavigignenti-juglandacearum), a fungus that produces stem cankers that girdle and kill adult trees.

Locations

Allegan County
Alpena County
Arenac County
Barry County
Benzie County
Berrien County
Branch County
Cass County
Chippewa County
Clinton County
Delta County
Eaton County
Gratiot County
Hillsdale County
Ingham County
Isabella County
Jackson County
Kalamazoo County
Kent County
Lapeer County
Leelanau County
    Only on Manitou Islands
Lenawee County
Mackinac County
    Only on Bois Blanc, Mackinac, Round Islands
Macomb County
Mason County
Menominee County
Midland County
Monroe County
Montcalm County
Muskegon County
Newaygo County
Oakland County
Ottawa County
Saginaw County
Sanilac County
St. Clair County
St. Joseph County
Tuscola County
Van Buren 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 18, 2017. http://www.michiganflora.net/species.aspx?id=1495.