Schlumbergera russelliana

About

Schlumbergera russelliana is a species of flowering plant in the family Cactaceae. It is endemic to a small area of the coastal mountains of southeastern Brazil, where its natural habitat is moist forest and it grows on trees as an epiphyte. It is one of the parent species from which many of the popular houseplants known as Christmas cactus or Thanksgiving cactus are descended.

Summary from Wikipedia