main page of aboriginal citruses:

http://www.saalfelds.freeserve.co.uk/AusNatCitrus.htm

Perhaps some would be good drought tolerant rootstocks in the near future:
http://www.saalfelds.freeserve.co.uk/eremocitrusglauca.htm
http://www.saalfelds.freeserve.co.uk/microcitrusaustralis.htm
http://www.saalfelds.freeserve.co.uk/microcitrusaustralasica.htm

Hi Joe. That is Citrange's site. He is a member here. He posted his link in the links section a while ago.

Sorry for that. I did try to search this site using the keyword "Australia" but his post did not come up. Perhaps we can add that keyword to his posted links.

Thanks for the links to my pages. Some are getting a bit old now - it's an effort to keep updating everything.
It's almost impossible to get hold of the latest selections of the Australian varieties. They all have 'Plant Breeders Rights' and this prohibits legal export. And of-course both USA and the EU prohibit imports. However, eventually someone, somewhere breaks the rules and starts distributing them.
Most countries allow seed imports, so selections and hybrids of the Australian native citrus varieties can be produced in this way.
I've tried to track down old, fruiting specimens from before the era of plant import rules. I've listed on those web-pages the few I've found.
If you enjoy looking around botanical gardens in your travels, keep your eyes open and let me know if you find any more.
Mike, or 'Citrange'

Mike, thanks for sharing us your rarest collections! We'll keep an eye on them.