While looking for info on Merriana, I found this web site about Ipomoea and other morning glories: http://waynesword.palomar.edu/ww0804.htm There is also a great photo of I. platensis and a link to the story about heart vine. Well worht checking out. John Ingram in L.A., CA. http://www.floralarchitecture.com/ "Your Clivia Connection" john@floralarchitecture.com 310.709.1613 (cell, west coast time, please call accordingly. Thank you)