Solanum ptychanthum Dunal
Coefficient of Conservatism: 1
Coefficient of Wetness: 3
Wetness Index: FACU
Physiognomy: Nt A-Forb

Native in eastern North America, and presumably in Michigan, where first collected in 1838 in Cass and Jackson Cos. by the First Survey, but weedy in habit. A pioneer on ground recently bulldozed, cleared, burned, or exposed by lowering of a pond or river; roadsides, railroads, old fields, shores, gravel pits, dump heaps, yards, and other disturbed ground; a weed in gardens.

Solanum ptychanthum has umbelliform inflorescences, seeds 1.3–1.6 mm long, and anthers 1.4–1.9 mm long; the berries are shiny and plants diploid. In the related Eurasian S. nigrum L., not so common in North America, the inflorescence is racemiform, the seeds and anthers are larger; the berries are dull; and plants are hexaploid. The southern S. americanum, as now defined, is similar to S. ptychanthum but has numerous white flecks on the immature fruit and fewer (not over 5) hard granules mixed with the numerous seeds in the mature berries.


Alger County
Allegan County
Alpena County
Antrim County
Arenac County
    Only on Charity Island
Baraga County
Bay County
Benzie County
Berrien County
Branch County
Calhoun County
Cass County
Charlevoix County
    Only on Beaver Island
Cheboygan County
Clinton County
Crawford County
Delta County
Dickinson County
Eaton County
Emmet County
Genesee County
Gladwin County
Grand Traverse County
Gratiot County
Hillsdale County
Huron County
Ingham County
Iosco County
Isabella County
Jackson County
Kalamazoo County
Kent County
Lake County
Lapeer County
Leelanau County
    Including Fox Islands
    Including Manitou Islands
Lenawee County
Livingston County
Luce County
Mackinac County
Macomb County
Manistee County
Marquette County
Mason County
Mecosta County
Menominee County
Monroe County
Montcalm County
Montmorency County
Muskegon County
Newaygo County
Oakland County
Ontonagon County
Ottawa County
Presque Isle County
Saginaw County
Schoolcraft County
St. Clair County
St. Joseph County
Tuscola 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 27, 2022.