Selenicereus Grandiflorus syn. Cactus grandiflorus, Cereus grandiflorus

I received this plant as a cutting from a friend. Theirs was about 7 feet long, and vining all over everything. I'm told it is a jungle succulent, that buries its roots into the bark of dead trees for nutrients. You can see a tiny baby vine coming out of the base of this cutting, and aerial roots along the length of the cutting.

If I can remember, I will snag a picture of the mother plant this weekend. Maybe that could help with ID. I've been stumped by this one since I first saw it in her storefront.

@gjones finally sorted this one out. selenicereus grandiflorus, aka queen of the night cactus, aka night blooming cereus. Flowers one night a year under the right conditions. I now have a goal, because it's flowers are stunning!