File photo of a Canadian flag painted on a scull oar during the women's lightweight double sculls heat at Eton Dorney during the London 2012 Olympic Games

 
File photo of a Canadian flag painted on a scull oar during the women
A Canadian flag is seen painted on a scull oar during the women's lightweight double sculls heat at Eton Dorney during the London 2012 Olympic Games July 29, 2012. Canada is known for the sugar maple, emblazoned on its red-and-white flag, but the Bank of Canada has put what one careful botanist says is a foreign Norway maple leaf on its new currency. The untrained eye might not at first spot the difference between the maple leaf on the new $20, $50 and $100 bills and the sugar maple that is endemic to North America. REUTERS/Jim Young/Files