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.
Habit : Cultivated / Labeled.
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