Just to clarify here.
I think David Constantine may well have been trying to draw a distinction between regular M. Basjoo and M. Basjoo var. Formosana, (whether this is correct or not I couldn't say).
This is distinct from M. Formosana. I am somewhat surprised that this is suggested to be Itinerans var. itinerans, which with it's running suckers should be fairly distinctive.
also native to Taiwan is M. Balbisiana var. Liukiuensis (the seeds were originally erroneously sold as M. Formosana)
whether and which of the Itinerans is over there is unclear.
simple eh!