Coefficient of Conservatism:
Coefficient of Wetness:
Sandy and gravelly open areas, introduced from south and west of Michigan.
Native throughout much of the southern Midwest but somewhat weedy in habitat preference, and spreading as a weed northwards into northern Illinois and northern Indiana. Collected in 1941 in Livingston Co., this inconspicuous plant may be somewhat overlooked.
Some southern collections have few or no papillae on the fruits, but more northern collections, especially those from adjacent states, are all densely papillose.