Common Name: Christmas Cactus, Holiday cacti, Thanksgiving Cactus, Easter Cactus. Scientific name: Zygocactus truncatus. Holiday cacti, often called Christmas cactus, is flowering plants in the Cactus family. are a popular, winter-flowering houseplant available for sale this time of year. The flower colors range from white to red, lavender and even salmon-orange. The flower colors range from white to red, lavender and even salmon-orange. Native to Brazil.