Adenium obesum

Description: Adenium obesum, commonly called desert rose, is a thick-stemmed sparsely-leaved perennial succulent that is native to semi-arid, Sub-Saharan regions of Eastern and Southwestern Africa plus the Arabian peninsula. In the wild, this plant will eventually rise to 6-9’ tall, but will grow much smaller in containers.

Flowering and Fruiting: January to May.

Economic Importance: Adenium obesum produces a sap in its roots and stems that contains cardiac glycosides. This sap is used as arrow poison for hunting large game throughout much of Africa and as a fish toxin. 

Reference: https://en.wikipedia.org/wiki/Adenium_obesum