FlG. i.— Fossil leaf of Rhododendron 

 ponticum from the Hotting breccia. 



(After v. Wettstein from Sollas. Repro- 

 duced by kind permission.) 



Fig. 2.— A flowering branch of the existing 

 Rhododendron ponticum from the Caucasus. 



(From Sollas. Reproduced by kind 

 permission. ) 



264] 



