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Epiphyllum (unk) perhaps, Lassenby's Hybrid.
orchid cactus plant got it
Grow Epiphyllum Cactus
How to Grow Epiphyllum Cactus. The epiphyllum cactus is a native Brazilian plant that grows in the sides and forks of trees in the canopies of the rain forests. It yields beautiful flowers that typically open in the evening and bloom for a.