Leaves more rounded then other wattles. Wattle flowers only sparse. Some of the shrubs had no flowers at all.
There are many of these shrubs on the Black Mtn Forest Loop Trail on the western side, but I can't say I've seen them anywhere else (which might just show my ignorance).
I just checked in the "Field guide to the native trees of the ACT" and it seems to match the Hickory Wattle (Acacia penninervis) which is rare in hte ACT but found on western slopes of Black Mtn (and Mt Taylor)