Brisbane is a city, so it does not have a floral emblem.

The floral emblem of Queensland, of which Brisbane is the capital, is the Cooktown Orchid.

The floral emblem of Newfoundland and Labrador is the Pitcher Plant

The White Trillium is the floral emblem of the province of Ontario, Canada.

The floral emblem of South Australia is Sturt's Desert Pea.

Being a city, Melbourne does not have a floral emblem.

Melbourne is the capital city of Victoria, and the floral emblem of Victoria is the Common Heath, also known as Pink Heath.