they're evergreen- leafless plants native to Africa. Starfish Cactus and Toad Cactus are misleading common names because this plant is not a cacti-it is a succulent. A better common name for this Orbea is Carrion Flower or African Carrion Flower.
native to Africa
Carrion flowers do such a good job at mimicking rotting flesh that flies flock to it looking for a moist place to lay eggs. Eventually some maggots will appear on the flower where they'll die because there won't be anything for them to eat.