Me too!!
Jim, looking at the triangular growth, I would think I am looking at Hylocereus. The blooms on a Hylocereus are very similar to Epiphyllum blooms as Carol mentions. But they are a Cereus.
Could it be this one?
http://en.wikipedia.org/wiki/F...
This might be very delicious! YUM!!
Hylocereus is many times used as the stock plant in those grafted "Moon cactus" one can easily buy. ( which are usually Gymnocalycium mihanovichii and would not survive on their own, because due to the lack of Clorophyll they can't grow on their own roots. Sometimes the graft falls off and one might be stuck with a small piece as the one you mentioned)
