Tribulus terrestris L.
Coefficient of Conservatism: *
Coefficient of Wetness: 5
Wetness Index: UPL
Physiognomy: Ad A-Forb

Originally native, apparently, to the Mediterranean area and now a noxious weed in warm climates. Rarely found as far north as Michigan, where it was first collected in 1930 along a roadside at Grand Rapids, Kent Co. It was collected in several other counties 1931–1937, so probably was dispersed before 1930. Still not common, but found also along railways, in poor lawns, gardens, parking lots, and similar disturbed ground.

Easily recognized by its prostrate habit; hairy stems and pinnate leaves, the latter consisting usually of 6–7 pairs of small leaflets; and spiny nutlets, the two principal spines on each nutlet stouter than those of the equally unpleasant Cenchrus.


Berrien County
Cass County
Ingham County
Kalamazoo County
Kent County
Muskegon County
Newaygo County
Oakland County
Ottawa County
Van Buren County
Wayne County


MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. November 29, 2022.