Found this plant in our gully. Looks like some sort of gooseberry though not the same as the gooseberries I grow. The leaves are similar in shape but these are brighter green in colour and smooth and thin.
We, thankfully, were untouched but the fire burnt around three of our boundary fences. Since the flood that followed the fire we are seeing a heap of different weeds and plants growing in the creek bed as well as a sea of Fireweed and Stinking Roger springing up on the property. This plant was found in exactly the conditions you mentioned, our damp gully. It is completely new for our property.