Stout, simple or branched, 3-6 dm; lvs thick or fleshy, somewhat shining, chiefly twice ternate with 9 lfls, the upper smaller or once ternate; lfls rhombic to obovate, 3-10 cm, obtuse or acute, sharply serrate above the middle, mostly entire and cuneate at base; umbels compound; rays 10-20, 2-5 cm; pedicels 5-10 mm; fr oblong, 6-10 mm, a third as wide, the ribs prominent and narrowly winged; 2n=22. Sandy or rocky seashores; Greenl. and Lab. to L.I.; n. Europe. July-Sept
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.