Rhododendron smirnowii
Rhododendron smirnowii, the Smirnow rhododendron, is a species of flowering plant in the family Ericaceae, native to northeast Turkey and the western Transcaucasus. In its native habitat it is found up to  in elevation, and in cultivation is hardy to USDA zone 5 with some protection. Its cultivar 'Vodka' gained the Royal Horticultural Society's Award of Merit in 1991. References

smirnowii
Flora of Turkey
Flora of the Transcaucasus
Plants described in 1885