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Branching annual to 1 m; lvs sparsely hispidulous, pinnately dissected, the ultimate segments 3–8 mm; umbels lf-opposed, lax, with 3–5 rays 1–2 cm; bractlets lance-ovate, aristate, 2–3 mm; pedicels elongating and becoming thicker than the rays in fr; fr ovoid, 3–4 mm, the body covered with short, thick, uncinate prickles, the short stout beak unarmed; 2n=14. Native of Europe, intr. here and there in the U.S. June, July. (A. scandicina)
An herb that grows each year from seed. It grows 60 cm tall. The stems are hollow and pale green. The leaves are divided 3 times and a fine. They have white hairs underneath. The crushed leaves have a sweet smell. The flowers are in white flat topped groups.
