Rhododendron loranthiflorum Sleum., Notizbl. Bot. Gart. Berlin-Dahlem 12: 485 (1935);
Papua New Guinea (Goodenough Island) to Solomon Islands: Bismarck Archipelago, New Guinea, Solomon Is. as per POWO;

Rhododendron loranthiflorum Sleumer: 6 very high res. images.

Location: Kew, London, UK
Altitude: 19 m.
Date: 04 April 2022
Habit : Cultivated / Labeled.
It was labeled as Rhododendron loranthiflorum but I could not get it on POWO, GBIF, CoL, WFO and IPNI and finally I came across this ID.
I Hope the ID is correct.

However, there are many links in Google showing this as Rhododendron loranthiflorum  !

I think it is available every where and id looks OK as per




POWO  Catalogue of Life