Hi David, I believe there are only 3 accepted species of Acca with Acca sellowianabeing the one most commonly grown. The other 2 would appear to have a very limited distribution and not be readily available, I'd certainly be surprised to stumble on them on this small island in the far East of the Med. The flowers are, as you point out, nothing like those of the Acca sellowianaso I'd take a lot of convincing that they were related.