I have post this help on ID cactus orchid b4,but since it has no flower,no one could said what it should be,so after few months of waiting,finally it flower 3 days ago and still looking good. It was a cutting from my friend, and she said it is from Vietnam and grow in her garden, now I have the flower, could some one I D it?( It might be difficult to ID it since there are so many species and hybrides)
here is another shot from differ angle
Latsyrc, you said it perfectly. It is nearly impossible to identify a cultivar from a picture or even in person because there are thousands upon thousands of Epiphyllum hybrids, many of which look alike. The best that you can say is that it is a lovely Epiphyllum hybrid.
