Cut-leaved toothwort (Cardamine concatenata)

Member of the Brassicaceae (Mustard) family.  Grows in rich moist woods, bottoms, 8 - 15 inches, April - June.  Whorl of 3 leaves, each divided into 3 narrow, sharply toothed segments.  Flowers white or pale lavender. 

To learn more about Cutleaf toothwort , visit its profile at the USDA Plants Database