I think you mean itinerans in stead of ventricosum
I have the 'indian form' and it produces pups that run down! (in stead of sideways)
I discovered that when I dug them out for overwintering in an unheated greenhouse. Unfortunately I damaged the pups doing this, no knowing it would grow in this fashion. Hopefully they'll make more pups, so I can get some more plants of this species.
I have the Musa 'Tibet' also, and at first I thought it was just a clone of basjoo, but now I can see some differences, so I guess it's really something else. Yangste I have never seen, but is on my wishlist ofcourse.