Freely branched biennial or short-lived perennial to 1 m; lf-segments 1.5-5 cm; umbels large, with 6-15 rays to 4 cm; bractlets lance-ovate, 3-6 mm; fr glabrous, lanceolate, 6 mm, the beak 1 mm; 2n=16. Native of Europe, occasionally found as a weed in our range. May-July.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.