This section is from the book "Harper's Guide To Wild Flowers", by Caroline A. Creevey. Also available from Amazon: Harper's Guide To Wild Flowers.
Family, Parsley. No involucre, but in-volucels of long, narrow leaves under the umbellets of white flowers. Leaves, twice or thrice compound, the divisions cleft again and again. Taste, acrid and burning. 12 to 30 inches high. July and August.
A poisonous and ill-smelling annual, naturalized from Europe.
 
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