There is some contention around this. For a while it seemed like there could be two species on mainland Africa (
https://en.m.wikipedia.org/wiki/Adansonia_kilima) and while most happily accepted the return of the status quo with the paper that decided they were all the same, I'm not entirely convinced (source: I collected location and morphology info from lots of these trees a decade ago and a number of traits were very distinctly bi-modal, although this is of course not proof that they're actually separate species). The Australian author who described A. kilima thought it was the diploid ancestor of the Australian species, rather than A. digitata or any of the Madagascan species...