Calystegia (bindweed, false bindweed, or morning glory) is a genus of about 25 species of flowering plants in the bindweed family Convolvulaceae. The genus has a cosmopolitan distribution in temperate and subtropical regions, but with half of the species endemic to California. They are annual or herbaceous perennial twining vines growing to 1-5 m ... Found on http://en.wikipedia.org/wiki/Calystegia
Calystegia is a genus of plants which is a subdivision of the family of the Convolvulaceae, and is closely allied to the genus Convolvulus, in which its species are often included. Found on http://www.probertencyclopaedia.com/browse/BC.HTM