Three species of Adonsonia. In most parts of the world the common name for these bottle-like trees is Baobab – the first two sketches are the African Baobab (A. digitata) and the Giant Baobab or Grandidier’s Baobab (A. grandidieri) respectively. In Australia they are mostly known as Boab’s (A. gregorri), but it is also known by a number of different names in different Australian Aboriginal languages. The Boab is native to the Kimberly region in the far northwest of Australia and is a wonderfully mysterious tree. No one really knows how or why it came to be in Australia, as they were not considered to be part of the Gondwana supercontinent. The three possible scenarios put forward by scientists for their occurrence is either they were brought here by the first people in Australia; the seeds floated across the Indian Ocean from Madagascar, or, while unlikely, it is still possible, the genus Adonsonia started in Australia and migrated to the rest of the world.
I will defer to First Australian wisdom in this one: Boab’s have always been here.