Just rebudded some Mwarburgiana. Well, this is a "seedling" from an arboretum. As with many such Mcitrus seedlings it may be crossed?
It seems to be pretty close to warburgiana pics on the net.
The bit of silver is alfoil wrapped around the top of the pencil size+/- rough lemon rootstock stump, to stop the stock from growing above the mw bud
http://imageshack.us/photo/my-images/405/imgp2715.jpg/

Very nice, the leaves look almost like a holly leaf.

When the budding grows out a bit more, I'll need some photos for my website!
Microcitrus warburgiana is not an Australian species, and the only example I could find was the one at Riverside. Can we have the name of the source arboretum?
Mike/Citrange