EXPLANATION OF THE PLATES. 



Plate CCCLVI- Quercus alba. 



1. A flowering branch, natural size. 



2. Diagram of a staminate flower. 



3. Diagram of a pistillate flower. 



4. Portion of an ament of staminate flowers, enlarged. 



5. A staminate flower, enlarged. 



6. A stamen, front and rear views, enlarged. 



7. A cluster of pistillate flowers, enlarged. 



8. A pistillate flower, enlarged. 



9. Vertical section of a pistillate flower before fecundation, enlarged 



10. Vertical section of a pistillate flower after fecundation^ enlarged. 



11. Cross section of an ovary after fecundation, enlarged. 



12. An ovule, much magnified. 



13. An axillary winter-bud and leaf-scar, enlarged. 



14. Diagram of a leaf-bud. 



Plate CCCLVII. Quercus alba. 



1. A fruiting branch, natural size. 



2. A nut, basal view, natural size. 



3. A cup, natural size. 



4. A cup-scale, enlarged. 



5. Vertical section of a nut, natural size. 



6. A seed, natural size. 



7. A germinating nut, natural size. 



8. A winter branchlet, natural size. 



Plate CCCLVIII. Quercus alba. 



1. A fruiting branch of a tree with pinnatifid leaves and long- 

 pedunculate fruit, natural size. 



