EXPLANATION OF THE PLATE. 
Puate CCCCLXXXIX. Porvunus HETEROPHYLLA. 
. A flowering branch of the staminate tree, natural size. 
. A staminate flower with its scale, enlarged. 
A stamen, enlarged. 
A flowering branch of the pistillate tree, natural size. 
. A pistillate flower, enlarged. 
. A fruiting branch, natural size. 
AOAah ON 
. A winter branch, natural size. 
