No. 517] 



MIOCENE TREES 



3<> 



Magnolia (?) pollardi Kn. 



* Ulmus minima Ward? 

 Sapindus affinis Newby. 



3. Common to Fort Union and Lamar. 



Asplenium iddingsi Kn. 

 Lygodium kaulfussi Heer. 

 Equisetwn deciduum Kn. 

 Juglans crcsccntia Kn. 



Ficus asvmiruE folia Lx. Also auriferous gravels 

 of California. 



MaiupJuna lamarensis\n. 

 Sapindus grandifoliolus Ward. 

 Sapindus ivardii Kn. 



* Hicoria antiqna (Newb.). 

 *Ulmus pseudofulva Lx.? 



Those marked with an asterisk occur in the Fort "Union 

 only outside of the Yellowstone. 



4. Common to the Intermediate and the Denver beds 

 (Basal Eocene). 



Osmund a tiffin is Lx. 



5. Common to the Lamar, Basal Eocene and Laramie. 



Rhamnus rectinervis Heer, Lx. Heer describes 

 this from Monod, in the Lower Miocene; we may 

 venture to doubt the identity of the American 

 plant. 



Thus we have twenty-six plants specifically identical 

 with those of the Basal Eocene. 5 



6. Common to Lamar and "Green River" of Knowlton. 

 (See also under 7.) 



Salix clnngata 0. Web. Said to occur at Elko 

 Station, Nevada, but represented only by un- 

 characteristic fragments. The determination of 



