Country Number of aloe species
South Africa 119
Saudi Arabia 22
Botswana, Eritrea, Lesotho 8 species each
Several countries in Africa and the Middle East have even fewer indigenous species of aloes, down to those that have only one aloe species growing indigenously (see the book for this detail).
Some species occur naturally in only very restricted areas, e.g. Aloe peglerae that is found on part of the top of the Magaliesberg in the Gauteng and Northwest provinces of South Africa. Other aloe species may be found naturally spread over the indigenous vegetation of several countries.
Aloe vera again, has now been planted by so many people for so long over such a large part of the world, that its exact origin (somewhere in the Middle East) is no longer quite certain.