Hi Guys!
I know this thread is very old now, but as it seems to be more about
Musa yunnanensis despite the thread title, I'll post this here.
The point I want to make here is that, most of us define
M. yunnanensis by the waxy character, but that is not always true.
Musa yunnanensis var. yongpingensis (Syn. Musa 'Tibet'), which is quite possibly from the highest elevation of any wild banana (2250 m asl) is not very waxy at all.
Sorry the picture's a bit big!