Wu & Wu (1996) first proposed the former Eastern Asiatic region to be an independent Floristic kingdom. However, there are still some questions that need to be discussed. As many living fossil plants (Cenozoic plant relicts) are only found in East Asia today, many researchers have suggested that the East Asiatic Floristic is an ancient flora and the cradle of North American, European floras, and even the modern Paleo-tropical flora.