EXPLANATION OF THE PLATES. 



Plate CCCLIX. Quercus alba x mixob. 



1. A fruiting branch, natural size. 



2- A staminate flower, enlarged. 



3. A cup-scale, outer sui*face, enlarged. 



4. A cup-scale, side view, enlarged. 



5. A leaf, enlarged. 



6. A leaf, enlaro^ed. 



showing 



pubescence, enlarged. 



Plate CCCLX. Quercus alba x macrocarpa. 



1. A fruiting branch, natural size. 



Plate CCCLXI. Quercus alba x Priktjs 



1. A fruiting branch, natural size. 



