Musa sikkimensis, also called Darjeeling Banana is a species of the genus Musa. It is one of the highest altitude banana species and is found in Bhutan and India.
Musa sikkimensis at Heronswood
The above sites says,
This unusual Himalayan banana species is native to regions with heavy annual snowfall and hard frosts. The outsize green foliage grows to 5 feet on stems that can be 18 feet or more. A robust grower, this dazzler's glossy dark green leaves radiate scarlet-red from the underside, with dramatic burgundy streaks on the leaf fronts. In our initial testing, this wondrous rarity has proven just as hardy as M. basjoo, possibly a partial zone hardier. Mulch heavily in zone 6. Give this one a try we'd love to hear your results