This is Aristolochia serpentaria, Virginia Snakeroot, Black Snakeroot. This plant likes to live in sun or partial shade where it will attract all kinds of birds, bees, and butterflies. Blooming from late Spring until the middle of the Summer, this beloved plant is considered a protected species. All Aristolochia species, except for the Aristolochia gigantea, are larval host plants for the Pipevine Swallowtail, Polydamas Swallowtail, and Mylotes Cattleheart butterflies. USDA Hardiness Zones 7 to 10