|A very unusual plant: Welwitschia mirabilis|
Welwitschia is only found in the Namib desert, where they plants are protected by law. It relies on regular fog that washes the area, providing the plants enough moisture to survive in the otherwise very arid environment. It also has a very large taproot, which can provide underground water to the plant. During drought, animals such as rhino and antelope will chew on the leaves for moisture. This plant was once eaten, and is said to be rather tasty, earning one of its names: "onyanga," meaning "onion of the desert."
These odd plants are believe to be relics of the Jurassic. Though somewhat difficult, Welwitschia can be cultivated.
Source is PlantZAfrica. Image is from Wikimedia Commons under a creative commons license.