Patricia, can you have a look at the photos of 'Bella di Monza' please? The less-fringed blooms of your plant seem very much like BdM. The 1933 reference by Nicolas says that the found plant of "Serratipetala" had reverted back to normal blooms, but later produced the carnation-mutation. – Jedmar (in Serratipetala photo comment)

Jedmar, that is of much interest. Most china roses for me, sit for a few years and never do much growing at all. But this rose just leapt out of the ground and is now using ‘General Schablikine’ as a prop for its long canes. It has a most unusual habit of growth which I liken to some wanton woman spreading her legs and showing her all. (That 1933 reference puts it more politely and says, as I should, “bush diverging”) I have put on more pictures of my bush, leaf and buds. None of the petals are showing an entire edge at the moment. All seem serrated.

I do not know the provenance of my bush which is growing from a 1998 cutting, beyond that of the Pinjarra Heritage Rose Garden, bed No. 7, site No. 8.
However, a large South Australian nursery imported ‘Serratipetala’ in 1965 from Sunningdale Nurseries in Surrey and it is possible that this may have been the same rose. .

I have no record of ‘Bella di Monza’ in any Australian catalogue or in the Australian Rose Annuals but I think you are so right here, that I shall change my rose listing to read: ‘Bella di Monza’ – came as ‘Serratipetala’. Many thanks for your very kind advice.