Lithops ~ A very unusual plant. Lithops is a genus of succulent plants in the ice plant family, Aizoaceae. Members of the genus are native to southern Africa, and are often known as pebble plants or living stones. Individual Lithops plants consist of one or more pairs of bulbous, almost fused leaves opposite to each other and hardly any stem. The leaves are not green but various shades of cream, grey, and brown, patterned with darker windowed areas, dots, and red lines.