Dirca palustris L.
Common Name: LEATHERWOOD
Coefficient of Conservatism: 8
Coefficient of Wetness: 0
Wetness Index: FAC
Physiognomy: Nt Shrub

Deciduous forests, especially rich moist sites. An interesting shrub, attractive in its early-blooming yellow flowers with strongly exserted stamens. The bud scales form a sort of involucre with conspicuous dark hairs on the outside. The bark is very tough and pliable, the source of the common name.

The alternate entire leaves give the foliage something of the look of the aromatic Lindera, but Dirca has peculiar angular swollen nodes with the petioles ± circular at the base, enclosing the developing axillary bud. A sharp line usually marks the contrast between the green petiole and the reddish brown twig.

An 1868 collection purported to be from Isle Royale is not mapped as the label (not original) is likely in error. This species is not otherwise known from Isle Royale, and the specimen is likely a duplicate of an A. E. Foote collection from Ontonagon County that was erroneously assumed to have been collected on Isle Royale by the University of Michigan party of 1868. 

Locations

Alger County
Allegan County
Alpena County
Antrim County
Baraga County
Benzie County
Berrien County
Calhoun County
Cass County
Charlevoix County
    Only on Beaver Island
Cheboygan County
Chippewa County
Clinton County
Delta County
Dickinson County
Emmet County
Genesee County
Gogebic County
Gratiot County
Houghton County
Ingham County
Iron County
Jackson County
Kalamazoo County
Kalkaska County
Kent County
Keweenaw County
Leelanau County
Lenawee County
Livingston County
Luce County
Macomb County
Manistee County
Marquette County
Mason County
Mecosta County
Menominee County
Missaukee County
Montmorency County
Muskegon County
Newaygo County
Oakland County
Ontonagon County
Ottawa County
Roscommon County
Schoolcraft County
St. Clair County
St. Joseph County
Tuscola County
Van Buren County
Washtenaw County
Wayne County
Wexford County

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 13, 2017. http://michiganflora.net/species.aspx?id=2727.