Desert rose tree (Adenium obesum sokotranum) flowers. This subspecies of the desert rose is endemic to the Socotran archipelago of islands, meaning that it is found nowhere else. The flowers are produced on branches at the top of a thick, bottle-shaped trunk (not seen). Socotra is located in the Indian Ocean at the mouth of the Gulf of Aden, 340 kilometres (km) from mainland Yemen and 250km from the coast of Somalia. Its isolation has led to the evolution of a unique flora and fauna.