(Black-Eyed Susan Vine, Clock Vine, Sky Vine) These tender vines are natives of tropical Africa, South Africa, tropical Asia and India. These plants are usually treated as annuals, though they will behave as perennials in mild climates. They will grow 3 to 15 feet long. The ovate to triangular leaves grow up to 4 inches long and they produce flower... Found on http://www.encyclo.co.uk/local/10004