This section is from the book "Who's Who Among The Wild Flowers", by W. I. Beecroft. Also available from Amazon: A Field Guide to Edible Wild Plants.
Arisaema triphyllum. Arum Family. Apr. - June.
A plant 10 - 30 inches high, springing from an acrid bulb, found in moist, shady woods. Nova Scotia, westward to Minnesota, and southward to the Gulf States.
Minute, clustered at the base of the smooth club within the flower envelope; latter pale green or marked with purplish stripes, variable in depth of color. Berries red, clustered in a head.
1 - 2, long-stemmed, smooth, divided into 3 large leaflets.

Jack-in-the-Pulpit.
 
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