This name is a synonym of Rhododendron charitopes subsp. tsangpoense (Kingdon-Ward) Cullen.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50064992) with original publication details: Rhododendron Year Book 3: 90 1948.
This name was in version 1 of The Plant List, record tro-50064992, and has not been changed.