Unknown Rare Aloe

In the corner of my garden is this aloe growing, and while chatting to my neighbour on this side of the garden about security co-operation, he saw the aloe and asked me if I knew that that aloe is very rare. According to my neighbour it only grows in this gorge that runs along my property all the way to the Walter Sisulu Botanical Gardens below. But for the life of the neighbour, he couldn’t remember the name. I tried to do some internet research on this unknown aloe as one does now days but had no joy on a rare aloe growing in this eco sub-system.

So if any one might know, please comment below.