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 50064989) with original publication details: Gard. Chron., ser. 3 86: 504 1929.
This name was in version 1 of The Plant List, record tro-50064989, and has not been changed.