Wild or prairie petunia is a perennial species of gravelly or rocky areas in the eastern and central states. The leaves are narrow and very bristly, with long petioles. The five-lobed flowers do resemble pale lavender petunias, but this is in fact in the acanthus family, not related to true petunias. A pretty little plant, it does well in rock gardens or other sunny sites where it will not be out-competed by taller plants.