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Epiphyllum oxypetalum
It grows on trees. It has large leaves around 20-40" long. It's flowers are big too about 6" in diameter and its hanging from the edges of its leaves with a pedicel around 12-15" long. It only blooms during 8pm - 10pm.
Grows on branches of trees
I forgot to take a picture of it at night time while it was in bloom