Black Forest Spike-thorn (Gymnosporia mossambicensis)

Family Celastraceae

 No information available on this. It is found only in the north eastern part of South Africa.

 The person who identified it for me had this to add:
"I would not say it is edible for humans since the species may contain toxic substances like Maytansine which was first extracted from an earlier name of the genus. Maytansine was thought to be a wonder drug for cancer, has since been demonstrated as being too poisonous for the patient. Later, from using plants in the same group in Pretoria Botanic garden it has recently been demonstrated the chemical does not come from the plant directly but from a soil pathogen. In the USA they recently used carriers to transport the drug directly to the colon cancer cell."