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EXPLANATION OF THE PLATES. 
Pirate CVIT. Ruus VERNIX. 
. A branch of the staminate tree, natural size. 
. A branch of the pistillate tree, natural size. 
. A staminate flower, enlarged. 
. Vertical section of a staminate flower, enlarged. 
. A pistillate flower, enlarged. 
. Vertical section of a pistillate flower, enlarged. 
An ovule, much magnified. 
Puate CVIII. Ravus VERN«rx. 
. A fruiting branch, natural size. 
A fruit, enlarged. 
. Vertical section of a fruit, enlarged. 
. A stone, enlarged. 
. A winter branchlet, natural size. 
