ANGIOSPERM.E. 



1549 



both hemispheres. The leaves (fig. 141 5, b) are readily recognised 

 by their lyre-like form and deep terminal emargination. 



The observations of Dr Newberry on this genus are so interesting 

 that, with some omissions and verbal alterations, they may be quoted at 

 length. The doctor observes, " that a plant so splendid should stand alone 

 in the vegetation of the present day excited the wonder of the earlier 

 botanists, but the Sassafras, Sweet-gum, and the Sequoias of the West 

 afford similar examples of isolation. Three species of Liriodendron 

 occur in the Cretaceous of New Jersey, and others have been obtained 

 from the Dakota group in the West, and from the Upper Cretaceous of 



Fig. 1415. — Leaves of American Cretaceous Dicotyledons, a, Sassafras cretaceum ; B, 

 Liriodendron Meeki; c, Leguminosites Marcouanus ; d, Salix Meeki. (After Dana and Les- 

 quereux.) 



Greenland. Though differing considerably among themselves in size 

 and form, all these have the deep sinus of the upper extremity of the 

 leaves so characteristic of the genus, and the venation is also essentially 

 the same. Hence we must conclude that the genus, now represented by 

 a single species, was in the Cretaceous age much more largely developed, 

 having many species, and those scattered over many lands. In the 

 Tertian- the genus continued to exist, but the species seem to have been 

 reduced to one, which is hardly to be distinguished from that now living. 

 In many parts of Europe leaves of the tulip-tree have been found, and it 

 extended as far south as Italy. Three European species have, indeed, 



