what are the rare indoor plants?
['Marimo Moss Balls.', 'Baseball Plant. ... ', 'Dolphin Succulent Plant. ... ', 'Lucky Heart Plant. ... ', "Donkey's Tail Plant. ... ", "Rabbit's Foot Fern. ... ", 'Pregnant Onion. ... ', 'Fire Pencil Cactus. This is one of the strange indoor plants belonging to the Cactus family and is indigenous to Africa. ... ']