oF WON 
ONAN P oO DOH 
EXPLANATION OF THE PLATES. 
Puate CCLXVIII. Fraxtnus AMERICANA. 
. A flowering branch of the staminate tree, natural size. 
. A flowering branch of the pistillate tree, natural size. 
. A staminate flower, enlarged. 
. A pistillate flower, enlarged. 
. Vertical section of an ovary, enlarged. 
Puate CCLXIX. Fraxrmyus AMERICANA. 
. A fruiting branch, natural size. 
. A fruit, natural size. 
. Vertical section of a fruit, natural size. 
A seed, enlarged. 
An embryo, enlarged. 
A leaf, natural size. 
. A winter branchlet, natural size. 
. A cluster of fruit of the variety microcarpa, natural size. 
