EXPLANATION OF THE PLATES. 



Plate CCCLXXX. Qukrcus platanoidks 



1. A flowering branch, natural size. 



2. A staminate flower, enlarged. 



3. A pistillate inflorescence, enlarged. 



4. A pistillate flower, enlarged. 



Plate CCCLXXXI. Quekcus platanoides 



1- A fruiting branch, natural size. 



2. A nut, natural size. 



3. A cup, natural size. 



4. Vertical section of a nut, natural size. 



5. A seed, natural size. 



6. A winter branchlet, natural size. 



