Cenozoic Floras Around the Northern Pacific 59 



Araliaceae Boraginaceae 



Aralia Cordia 



Sapotaceae Ehretia 



Chrysophyllum Verbenaceae 



Lucuma Petrea 



Ebenaceae Bignoniaceae 



Diospyros Callichlamys 



Styracaceae Caprifoliaceae 



Styrax Viburnum 

 Apocynaceae 



Apocynophyllum 



Ferns and gymnosperms have not been included because o£ 

 their comparative rarity in older Tertiary floras of western 

 America. 



The plants listed indicate a climate characterized by an annual 

 rainfall of not less than 80 inches and by a uniform temperature 

 free from frost — a climate (to mention only those regions v^ith 

 v^^hich the writer is familiar) essentially like that on the lower 

 slopes of Vera Cruz, Mexico, up to an elevation of 5500 feet on 

 the Pacific slope of Guatemala, in the savannas near sea level on 

 the Pacific slope of Panama, and at an elevation of about 5000 

 feet in the Andes of Venezuela near Merida. There is evidence 

 that the Goshen flora advanced northward from low latitudes 

 to its Eocene or Oligocene position in west-central Oregon." A 

 similar movement has been described for the somewhat older 

 Wilcox flora of the southeastern United States.^" Knowledge of 

 the Cretaceous floras of western America is so scant as to give 

 little information about the pre-Eocene distribution of the fami- 

 lies and genera involved, although it has been pointed out that 

 some of the genera and most of the families were widely dis- 

 tributed." If this movement from low latitudes can be demon- 

 strated, it will represent the most extensive northward migration 



