Thanks - yeah I've been reading that Acacia thread with very great interest!! And many of its side shoots.

It is awesome to see such a free exchange of information. Very different to the way it used to be.  (I do understand it's contentious though.) 

The wikipedia page is great too. The thread and wiki entry take up where Voogelbreinder's (incredible) Garden of Eden finishes (out of necessity, being a print publication)... on one genus at least  .