This is Aristolochia tiracambu#2. This mind blowing evergreen perennial sports very attractive medium to deep green heart shaped leaves. But the real star is the train whistle shaped purple flowers with creamy delicately haired throats. 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 8 to 10.