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 fine, long, thin bracts form an involucel under the umbellets.
Leaves, 2 to 3-pinnately compound, thin, the leaflets cut to the midrib. Late blooming, from August to October.
Tall, slender, smooth perennials found in swamps from New England westward, and to the mountains of North Carolina.
 
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