Leucanthemumvulgare, or ox-eye daisy as it is commonly called, is not a native species here in North America. It was brought here in the 1800s from Europe for use as a garden plant but then it managed to escape into the wild.
In the wild it is an invasive species. It often forms large patches with an extensive root system that crowds out many of the native plants. It usually can over take areas because each flower can produce up to 200 seeds.