This plant or similar one has been identified by our botanists as R.walichii because they don’t see any differences in their flowering structures.
I believe that it has many similar relatives distributed throughout the area of southeast Asia eventhough small changings such as the leaves’ color or shape could be found on some specimens collected from different places.
The name of Nanjean is meaning that it comes from the Lake Nanjean in the south Taiwan, which needs to be confirmed by your botanists, because I was told by my friend that in Thailand there is a similar species with greenish leaves compared to the plant.