Lithops often referred to as "Living Stones" comprise a diverse genus of plants endemic the vast dry regions of southern Africa. Lithops are true mimicry plants - their shape, size and color causes them to resemble small stones in their natural surroundings. Individual plants consist of one or more pairs of bulbous, almost fused leaves opposite to each other and hardly any stem. The slit between the leaves contains the meristem and produces flowers and new leaves. The leaves of Lithops are mostly buried below the surface of the soil, with a partially or completely translucent top surface known as a leaf window which allows light to enter the interior of the leaves for photosynthesis.