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The new site offers several benefits over the existing website, including real coordinate mapping, giving a clearer view of the density of documentation as well as more precision about plant distributions and their link to landforms. We will also have the ability to update species pages more regularly, both in terms of new collections and as more existing Michigan specimens are georeferenced. In addition, we have a better photo display, and offer indented keys.

Gleditsia triacanthos L.
Coefficient of Conservatism: 8
Coefficient of Wetness: 0
Wetness Index: FAC
Physiognomy: Nt Tree

Gleditsia triacanthos B. S. Walters

Apparently indigenous on river banks, shores, floodplains, and lowland woods as far north as the Detroit, Huron, and Kalamazoo Rivers. Escaped by seeding and also by root suckers to natural habitats as well as filled land, vacant lots, roadsides, shores north well into the northern Lower Peninsula.

Though collected from along the Grand River before 1900, Cole (1901) noted that occurrences were all spread from cultivated trees. Thus, records mapped north of the southern three tiers of counties represent clear escapes, but a few of those farther south may also be based on escaped or even planted trees when label data with specimens are not clear. The stems of wild plants are typically fiercely armed with stout thorns, these compound on older branches and trunk.

This species, and Cercis canadensis, display cauliflory; inflorescences arising from the trunk and older branches, a feature typically associated with tropical trees. 


Allegan County
Alpena County
Benzie County
Berrien County
Hillsdale County
Ingham County
Kalamazoo County
Kent County
Leelanau County
Lenawee County
Livingston County
Monroe County
Oakland County
Oceana County
Ottawa County
St. Joseph 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. January 30, 2023.