This is not a joke! But this one is also called R.wallichii because they have identical flower structures. At first I didn't accept this view proposed by our botanic experts, while more than one of them remain this opinion.
Recently I found some books call it ''R.nanjean", which "nanjean" is the mountain in the southern Taiwan. Actually I wonder this scientific name has been really accepted by the world experts for aquatic plants or not.