Rhodochiton atrosanguineus

Rhodochiton atrosanguineus is a herbaceous perennial vine native to Mexico. It has been cultivated as an ornamental plant since at least 1836. Although the specific epithet is sometimes spelled atrosanguineum, chiton in Greek is masculine, so the ending is correctly -us. Rhodochiton atrosanguineus has been known colloquially in the UK as the "black man's willy". Another common name is purple bell vine or simply purple bell. All Rhodochiton species are sometimes placed in the genus Lophospermum....read more on Wikipedia.