Centipeda cunninghamii

Centipeda cunninghamii is a species of flowering plant in the Asteraceae family. It is referred to by the common names old man weed, being the literal translation of its Koori name gukwonderuk, common sneezeweed and scent weed which were given by European settlers but are increasingly falling out of use. The plant was used by indigenous Australians for its purported medicinal properties. It grows along the Murray River, or generally anywhere there is water, especially low lying or swampy areas. It can be identified by its unique shaped leaf and its pungent scent which is pine-like and minty.

from Wikipedia