Schlumbergera is a genus of 6 known tree-welling cacti from Brazil. These are the tropical rainforest epiphytes, growing on tree branches where, despite the high rainfall, water drains off quickly so that "dry" conditions prevail much of the time. Not surprisingly these cacti are quite different in appearance to their desert dwelling cousins. They are named after Frédéric Schlumberger, french, who was the owner of a famous plant collection.