corkscrew vine
The blooms of the corkscrew vine resemble a snail's shell when viewed from the side. The corkscrew or snail vine (Vigna caracalla), a tender perennial vine, produces fragrant, spiral blooms. Apart from the unusual white or yellow and purple blooms, the plant has beanlike foliage that is evergreen in U.S. Department of Agriculture plant hardiness zones 9 through 12.