Rhododendron arboreum subsp. zeylanicum (Booth) Tagg, Species of Rhododendron 16 1930 (syn: Rhododendron zeylanicum Booth);
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Sri Lanka as per CoL;
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Rhododendron arboreum subsp. zeylanicum from UCBG-GS28082021-1: 3 images.
Rhododendron arboreum subsp. zeylanicum (Booth) Tagg
Syn: R. zeylanicum Booth
Locally known as Maha Rath Mala, the tree is endemic to highlands of Sri Lanka. It is official Flower of Central Province. Details can be found here:
Photographed from University of California Botanical Garden, 22-4-2019.
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References: Catalogue of Life POWO The Plant List Ver.1.1 IPNI GBIF (High resolution specimens) Wikimedia Commons rhododendron treesandshrubsonline