This is Aristolochia tagala, also known as Indian birthwort. A very common synonym is Aristolochia acuminata. This evergreen climber can grow up to about 50 feet long. The plant waits until an insect gets close to the opening of the plant's pitcher and then it points all of its hairs inward and the insect slips down into the plant and helps it pollinate itself. The plant does not turn its hairs outward and release the insect until pollination is complete and the insects work is finished. This plant is a larval host for the Common Rose and Common Birdwing butterflies. 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 9 to 11.