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; 

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

near tonglu 3050 m altitude, singalila national park
was blooming profusely
short trees not more than ten feet
would appreciate an id

second week of april this year

reference flowers of india

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.

Three links of Rhododendron arboreum ssp. cinnamomeum as have been suggested by …-

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Rhododendron arboreum Sm. (accepted name) ?? : 4 posts by 2 authors. Attachments (5)

Location: Chandragiri Hills, Kathmandu, Nepal
Altitude: 8600 ft.
Date: 2 March 2017 

Rhododendron arboreum Sm. (accepted name) or further subsp.??
Pl. also check comparative images at ‎Rhododendron 

Appears close to images at Rhododendron arboreum var. cinnamomeum Wall. ex Lindl. ?

 

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SK846 02 Nov-2017:ID : 5 posts by 3 authors. Attachments (3)

Location: Thulo Phedi, Taplejung, Nepal
Date: 18 April 2017
Altitude: 11000 ft
Rhododendron …. ????

Yes. Common Rhododendron.  

R. arborium ??

Yes, … The closest I reach is Rhododendron arboreum var. cinnamomeum Wall. ex Lindl. ? as per comparative images at Rhododendron

Thank you ..

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SK1209 16 JUNE 2018 : 10 posts by 3 authors. Attachments (5)- around 1 Mb each. 
Location: Sandakphu, India
Date: 13 May 2018
Altitude: 12000 ft.
Habit : Wild
I for this Rhododendron please !

Pl. check 

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Yes …! Checked before posting

Is it not R. arboreum?

Could be R. arboretum

To me appears close.

The first three are R. arboreum subsp. cinnamomum var. roseum and the last one is R. campanulatum.