EXPLANATION OF THE PLATES. 



Plate CCCLXVI, Quercus Gambelu. 



1. A flowering branchy natural size. 



2. A staminate flower, enlarged. 



3. A pistillate flower, enlarged. 



4. A fruiting branch, natural size. 



natural 



Plate CCCLXVIL Quercus Gambelh 



1. A fruiting branch, natural size. 



2. A leaf, natural size. 



3. A leaf, natural size. 



4. A fruit, natural size. 



5. A fruit, natural size. 



6. A winter branchlet, natural size. 



