Previously identified as Asparagus officinalis Asparagus officinalis (Asparagus) but it is not that. Possibly Asparagus virgatus. Stiff perennial with small orange fruit and single round seed.
I went looking for https://inaturalist.ala.org.au/observations/18769961 Asparagus virgatus on Red Hill for comparison and found that it was Asparagus officinalis. This Mawson sighting looks quite different.