The following information on the natural distribution of the aloe species of the world was found in the book: Aloes, The Genus Aloe, edited by Tom Reynolds and published by crc press.

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.

 

Country Number of Aloe Species
South Africa  119
Madagascar 77
Kenya 55
Tanzania 40
Ethiopia 34
Somalia 33
Zimbabwe 27
Namibia 26
Yemen 26
Mozambique 25
Angola 24
Saudi Arabia 22
Zambia 19
Swaziland 18
Malawi 17
Uganda 16
DRC 13
Sudan 12
Botswana, Eritrea, Lesotho