Not native to Wisconsin
Find it in generally dry places, fields, roadsides and the like.
Male and female flowers are on different plants. These are harder to pick out during the day because the flower tucks into the tube at its base (which gives its other name, Bladder Campion). The flower comes out then at night to attract insects. The whole plant stands about 1-3 feet high, and the flower itself is maybe an inch across.