70 



SILVA OF NORTH AMERICA. ulmace^. 



is perhaps as beautiful in less favored regions^ with its shorter trunk, broad head of graceful branches 

 and dense light green foliage. Few North American trees are better suited to adorn parks or high- 



ways ; and 



creased by its rapid growth under varied conditions of 



climate and soil, its resistance to drought, and its freedom from serious diseases and the injuries caused 

 by insects. The Hackberry is now often planted as a shade-tree in some of the states between the 

 Missouri River and the Rocky Mountains, and occasionally in other parts of the United States and in 

 Europe. It can be raised from seed without difficulty ; and its abundant fibrous roots make the 

 operation of transplanting it easy and safe. 



EXPLANATION OF THE PLATE. 



Plate CCCXVIL Celtis occidentalis. 



1. A flowering branch, natural size. 



2. Diagram of a flower. 



3. A staminate flower before the straightening of the 



filaments, enlarged- 



4. A staminate flower expanded, enlarged. 



5. A perfect flower, enlarged. 



6. Vertical section of a perfect flower, enlarged. 



7. An ovule, much magnified. 



8. A fruiting branch, natural size. 



9. Vertical section of a fruit, enlarged. 



10. A fruit cut open transversely, enlarged. 



11. An embryo, enlarged. 



12. An embryo partly displayed, enlarged. 



13. A winter branchlet, natural size. 



