476 PALEOBOTANY. 



is, upon the wliole, so closely allied to that now existing as 

 to call for no special mention. It is worthy of notice, how- 

 ever, that the Pliocene flora of Europe was strikingly similar 

 to that now existing in North America. Thus, we find in 

 the Pliocene of Europe genera such as the Loc.ust-trees 

 {Bohinia), the Honey - locusts (GkditscMa), the Sumach 

 {Rhus), the Bald Cypress, (Taxodium), the Tulip-tree {Lirio- 

 dcndron), the Sweet-gum tree {Liquidamibar\ the Sour-gum 

 tree {Nyssa), &c., which do not now occur in Europe, but 

 are at present characteristic forms in the flora of temperate 

 Xorth America. 



