The Rhipsalis plant is a succulent epiphytic cactus (like fishbone, Orchid cactus Epiphyllum and Hatiora) meaning it grows on other plants, drawing nutrients from the environment.
Mistletoe cactus hails from the rainforests of Central and South America. It earned the common name mistletoe cactus because of the spineless appearance giving a drooped over effect. It makes a wonderful hanging plant.
Source: Plant Care Today