Not an accepted name (status: unknown). The accepted name is Rhododendron arboreum subsp. cinnamomeum (Wall. ex G.Don) Tagg, 1930.

Rhododendron arboreum var. cinnamomeum (Wall. ex G.Don) Lindl., 1930 2% complete

No common name

Edwards's Bot. Reg. 23: t. 1982. 1837

There is no corrections for Rhododendron arboreum var. cinnamomeum yet.