Compare also with Backhousia subargentea (synonym: Choricarpia subargentea) . Has stamens tomentose .
Also growing in the botanic gardens there .
Whereas Backhousia leptopetala has stamens glabrous (hairless) .
In these photographs so far i could not quite make out whether these stamens have hairs on them or not .
More possible candidate species especially in this Myrtaceae botanical family and a few more botanical families i suggest as candidates such as Cunoniaceae eg. Callicoma serratifolia . To check .
And let's check the botanic gardens plantings in the field and in the gardens inventory if this species or a related species has been planted and grows as a tree here above this spot ?
Ref' to start with (in brief, without full citation):
• Flora of NSW online PlantNet : https://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&lvl=sp&name=Backhousia~leptopetala
• Australian Plant Image Index photographs: https://anbg.gov.au/cgi-bin/apiiName2?name=Backhousia+leptopetala .
My guess is that the photo is of about seven 'spent' flowers that have fallen from a tree, the base of each flower (we're looking at them side-on) showing 2-3 yellowish sepals and bundles of purplish-brown stamens that have been caught up with each other to the form the single 'mass'. The anthers are very small but visible in a couple of the photos.
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