Daucus carota
A common weed in fields in Indiana, and the parent of the cultivated carrot. I haven't seen this species in the southwest yet, but it's out here somewhere.
Inflorescences on the north side of Bloomington, Indiana, 6/28/04.
An inflorescence near University Lake, north of Bloomington, Indiana, 8/9/03.
A leaf near University Lake, 8/9/03.