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