Sorry Toni - this slipped my mind but remembered early this morning. I think you will have to consider this as Madagascan fireweed and pull it out - sorry for the delay. The leaves are typical fireweed like leaves and there are no varieties of Senecio pinnatifoliuus that have leaves like these. I was originally put off Madagascan fireweed by the purple colour of the bracts rather than being predominately green , but then the leaves are more purplish than you would expect and perhaps this is a result of weevil damage. @Parks818 @ACTParks-InvasivePlantsTeam do you have anything to add?
Toni If you come across any more plants like this, check the number of bracts at the back of the flower. See advice in Senecio madagascariensis (Madagascan Fireweed, Fireweed) and also another picture from a sighting at Michelago Senecio madagascariensis (Madagascan Fireweed, Fireweed) which shows the back of the flower. I came across another fireweed plant this week, on Mt Majura so that is why I've been checking up on the id traits. Cheers from Barb Read