Golden Wattle

Acacia pycnantha enjoyed popular acceptance as Australia's national flower for much of this century but it was not proclaimed as the national floral emblem until 1988, the year of Australia's bicentenary. 
A ceremony was held on 1 September 1988 at the Australian National Botanic Gardens when the Minister for Home Affairs, Robert Ray, made the formal announcement, and the Prime Minister's wife, Mrs Hazel Hawke, planted a Golden Wattle.  
Four years later, in 1992, the 1 September was formally declared 'National Wattle Day' by the Minister for the Environment..