Family, Parsley. This species has tuber-bearing roots which are poisonous. Its umbels of white flowers appear in August. It is from 2 to 5 feet tall, with pinnate leaves, once cut. Leaflets, 3 to 9. An involucre of fine bracts lies under the umbel, and smaller bracts underlie the secondary umbellets.

A coarse plant of swamps and low grounds. Probably its parts are all more or less poisonous. Found in all the Eastern States.