Tridens flavus (L.) Hitchc.
Common Name: PURPLETOP
Coefficient of Conservatism: 3
Coefficient of Wetness: 5
Wetness Index: UPL
Physiognomy: Nt P-Grass

Oak savanna, sandy clearings, roadsides, and railroads; perhaps originally native (if at all) only in southwestern Michigan, where collected in Berrien Co. by the First Survey as early as 1838. The dark purplish-gray inflorescences are now striking in early fall along freeways, especially in the medians. The axis and branches of the inflorescence are usually covered with sticky dots. An “albino” variant with yellow inflorescences has been collected in Livingston Co.


Allegan County
Barry County
Bay County
Berrien County
Branch County
Calhoun County
Cass County
Clinton County
Eaton County
Genesee County
Grand Traverse County
Gratiot County
Hillsdale County
Huron County
Ingham County
Ionia County
Isabella County
Jackson County
Kalamazoo County
Kent County
Lenawee County
Livingston County
Mason County
Monroe County
Montcalm County
Muskegon County
Newaygo County
Ottawa County
Saginaw 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. June 25, 2022.