Sandy fields and meadows, including interdunal flats, shore meadows, and oak openings.

Our plants are var. texanum (Planch.) Fernald, by far the commoner and more widespread variety, and a diploid. The tetraploid var. medium differs in having the inner sepals sparsely if at all glandular-ciliate (as well as in fruit characters) and occurs east of Michigan mostly on the east shore of Lake Huron.