This is a interesting one because there is 2 Morning Glory's, the first one (I think this is yours) is Brassocattleya Morning Glory, the parents being Brassavola nodosa x Cattleya purpurata, ( yes purpurata is now a cattleya), the second one is Catyclia Morning Glory, parents are Cattleya Issy x Encyclia cordigera. Hope this is of some help.
Warren