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. Color, white, except that the central flower of each umbel is defective and purplish. After flowering the umbel becomes concave or nest-shaped. Leaves, 2 to 3-pinnately compound. 1 to 3 feet high. Summer.
Too well known to need description. Imported from Europe, it has become a common and most troublesome weed in and about cultivated grounds. In New Jersey whole fields are white with the wild carrot. Were it less common, the soft, fine appearance of the umbels of flowers, together with its prettily cut leaf, might win favor. As it is, the flower painter finds it a pleasant thing to transfer to canvas, but the farmer does not like it.