This is a reasonably common plant along lake shores and other low, wet areas in Indiana.
It also occurs in the southwest, though I haven't seen it out here.
An inflorescence on the shore of Lake Lemon, northeast of Bloomington, IN, 7/17/03.
Closer view of flowers on the shore of Lake Lemon, 7/17/03.
A cauline leaf on the shore of Lake Lemon, 7/17/03.