This is Aristolochia baetica, also known as Portugese Hardy Dutchmans Pipe, and Birthwort. This plant likes to live in sun to partial shade where it normally blooms from late Spring until the middle of the Summer. 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 5 to 9.