Rhododendron arboreum var. cinnamomeum

Rhododendron arboreum var. cinnamomeum Wall. ex Lindl., Edwards’s Bot. Reg. 23: , pl. 1982 1837. (syn: Rhododendron arboreum subsp. campbelliae (Hook. fil.) Tagg; Rhododendron arboreum subsp. cinnamomeum (Wall. ex Lindl.) Tagg; Rhododendron arboreum var. cinnamomeum (Wall. ex Lindl.) W.K. Hu; Rhododendron campbelliae Hook. fil.; Rhododendron campbelliae Hook. fil.) ?;   

S-Tibet, E-Nepal, NE-India, Darjeeling, Vietnam as per Catalogue of Life; 

rhododendron for id mm 2 26 05 2012: rhododendron, ericaceae family

second week of april this year

reference flowers of india

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I suppose there are two individuals (the last photo seems of a different individual). (?)
Also, how was the underside of the leaf? For species identification of Rhododendron much depends on the type of bark, type of hair/ tomentose on the underside of leaves along with the floral aspects.
If the underside has brownish tomentosum, peeling bark exposing inner red layer then it could be R. arboreum subsp. cinnamomeum.

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Yes. Common Rhododendron.  

SK1209 16 JUNE 2018 : 10 posts by 3 authors. Attachments (5)- around 1 Mb each. 

References:

Catalogue of Life  The Plant List Ver.1.1
 Tropicos  IPNI  Hirsutum.info