tangledwing:

Dwarf larkspur and sometimes spring  (Delphinium tricorne) is a flowering plant in the buttercup family. It is native to the eastern United States.It a perennial that sends up long, stringy thin stems with few leaves and bears attractive flowers in shades of blue. D. tricorne should be treated as a potentially poisonous plant. This species has long been regarded as poisonous to livestock. Lower picture by Tim Martin.