Euphorbia ampliphylla

About

Euphorbia ampliphylla is a succulent rainforest tree of the montane rainforests throughout East Africa and belonging to the family Euphorbiaceae. The branches are each about 20 cm (8 in) diameter and are succulent, three-winged and pachycaulous. Like most Euphorbia species, it has milky white sap. The toxicity of many euphorbias is well known, but no specific information is available concerning E. ampliphylla. It is used locally for medical purposes. It is one of the tallest of all known succulent plants, definitely up to 30 m (98 ft) It is also the world's only known succulent rainforest tree.

Summary from Wikipedia