Platysace lanceolata looking shrubby Pimelea like here in this example . The flowers' petals and stamens and styles piqued my awareness of this identification, rather than also my initial impression of these photographs from a distance of a species of Pimelea .
Ref':
• Flora of NSW online PlantNet: https://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&lvl=sp&name=Platysace~lanceolata .
I have revisited the dam site. There is a mixture of plants there and in the photos. The two species seem to be Echinochloa (in the foreground of photo 1) and Persicaria lapathifolia - Pale Knotweed in the background of Photo 1 and Photo 2
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