
Flax leaved Horseweed/Fleabane - Conyza bonariensis
Widely naturalised and very common in south-eastern Queensland. Widely naturalised other parts of Australia (i.e. New South Wales, the ACT, Victoria, Tasmania, South Australia, the Northern Territory, many parts of Western Australia, and other parts of Queensland). Also naturalised on Lord Howe Island, Norfolk Island, Christmas Island and in the Cocos Islands.
https://weeds.brisbane.qld.gov.au/weeds/flaxleaf-fleabane

"Erigeron bonariensis" is a species of "Erigeron", found throughout the tropics and subtropics as a pioneer plant; its precise origin is unknown, but most likely it stems from Central America or South America. It has become naturalized in many other regions, including North America, Europe and Australia.