alternate leaves, leathery, one stem is almost 6 feet long

we are trying to figure out what this plant is. We received a tiny stem from one about 6 years ago, and it has taken off. We have several offspring now. It has not yet flowered, and the leaves and stems easily root. We give it medium light and water frequently. The long stem in the photo is almost 6 feet long. I appreciate any help.

Vicki

 

I have one of those. I know it only as "Queen of the Night".

 

I just looked it up:
Epiphyllum oxypetalum

 

night blooming cereus?

 

http://en.wikipedia.org/wiki/Nightblooming_cereus

 

i also have it. grow it in a large pot and hasn't bloomed yet. gave a cutting to a friend, who put it in a much smaller pot, and he said this autumn it was blooming like hell
i guess it likes to be root-bound?
i loved it when i was in taiwan... most gardens had it, and also houses had pots with it in front.
blooms at night...so i was hunting for blooms to take pics. at night

 

Mine only bloomed once in all the years I've had it. The smell was heavenly