Aloe vera
Techniques based on DNA comparison suggest "Aloe vera" is relatively closely related to "Aloe perryi", a species endemic to Yemen. Similar techniques, using chloroplast DNA sequence comparison and ISSR profiling have also suggested it is closely related to "Aloe forbesii", "Aloe inermis", "Aloe scobinifolia", "Aloe sinkatana", and "Aloe striata". With the exception of the South African species "A. striata", these "Aloe" species are native to Socotra (Yemen), Somalia, and Sudan. The lack of obvious natural populations of the species has led some authors to suggest "Aloe vera" may be of hybrid origin.