Aloe polyphylla, or spiral aloe, is native to Lesotho, though it is possible that it may occur in the surrounding South Africa. I've been trying to track down the conservation status – words like endangered and threatened are used on various sites, but it doesn't have a place in the 2007 IUCN Red List. It is, however, an Appendix 1 species in the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) , meaning it has the highest protection in terms of international trade. The cultivated plant in today's photograph will have been propagated from material in cultivation prior to the implementation of CITES in 1975.
Plantzafrica.com once again provides a detailed factsheet on the species, Aloe polyphylla. The US Botanical Garden also has brief article on spiral aloe, emphasizing the threats to the natural populations (including “unsustainable harvesting”).