Rhododendron ungernii hybr.

Rhododendron Ungernii hybrid

Of the four evergreen rhododendrons native to the Caucasus Mountains, Ungern’s rhododendron (R. ungernii) is both the least cultivated and the least known. To some extent it resembles the Smirnow rhododendron (R. smirnowii), both species having leaves with felted undersurfaces. However, the upper surface on the Ungern loses its hairiness very quickly when the leaves reach full size, while with the Smirnow a degree of hairiness persists.