The lithops is a succulent native to Africa, mainly in Namibia and South Africa. It is especially characteristic of the Karoo region at Africa's southern tip. The guy who named them was actually a botanist who picked one up off the ground, thinking it was an interesting pebble.
"There is no stem as such, but rather the taproot joins abruptly at the base of the leaves. The structure of the plant reveals to the imagination the harsh environment in which Lithops live: the scarcity of water demands that young plants limited to only two leaves and a root system, as more extravagant growth would only serve to waste water.
The leaves are thick to store enough water for the plants to survive for months without rain. The plants are small and keep a low profile to minimize the effect of the intense heat and light of their climate."
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main article on wiki
great gallery of other lithops