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Swanflower (Aristolochia erecta) flower and seed pods. This is the host plant for the Pipevine Swallowtail. Waterstone Nature Preserve, Wimberley, Hays County, Texas. Canon 1Ds Mark III with a 300 mm f/4 IS lens with a 2x teleconverter and fill flash. Exposure was manual, f/22, 1/300s, ISO 400, 05-25-08.
