Erect, branched above, 3-7 dm; lowest lvs simple or variously divided into obovate incised segments; upper lvs pinnately dissected into linear segments; outer enlarged pet to 4 mm; fr 3-5 mm wide; sep persistent, those of the outer row of frs 1 mm or more; 2n=22. Native of the Mediterranean region, established as a weed over much of the U.S., especially southward. June, July.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.