I know this flower by its common name - "Yellow Beauty" 黄花美人 : Garden flower series issued 1.7.2010

I used to know this flower as a "Yellow Beauty " 黄花美人 and this common name was given as it describes a beautiful yellow flower. The scientific name Canna Orientalis is alien to me, I can remember once BUT I will not keep in my brain next, still the common name is the easiest to remember. 

• A maximum card realised with a "Yellow Beauty" stamp issued on 1.7.2010, FDI pictorial Cancel @ Seremban