Dutchman's Breeches (Dicentra cucullaria)
Above: Dutchman's Breeches along the C&O Canal in Washington Co., Maryland (4/3/2010).
Below: The very similar native wildflower, Squirrel Corn (Washington Co., 4/3/2010).
Below: Jim Stasz demonstrates the difference between Dutchman's Breeches (left) and Squirrel Corn (right, held).