This population of larkspur isn't long for this world. It was in a jungle of Japanese knotweed, along with scattered white trillium, Canada waterleaf, and other remants of native vegetation.
Delphinium tricorne is a perennial flowering plant known by the common name dwarf larkspur. It sends up long, stringy thin stems with few leaves and bears attractive flowers in shades of blue. It is found throughout the eastern United States and in the Great Smoky Mountains National Park.