Black snakeroot leaves

This is a closer shot of the three-part compound foliage of Black snakeroot, Actaea racemosa, a shade-loving woodland perennial native to the eastern and midwestern states, also called black cohosh and formerly classified as Cimicifuga racemosa.
 
For more about black snakeroot and native plants for the Midwest, especially those that do well in shade/moist areas, see the "book" on this website, Gardening with Native Plants in Shady Evanston.