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EXPLANATION OF THE PLATES. 
PuatE XCVI. Acer NEGUNDO. 
. A flowering branch of the staminate tree, natural size. 
. A flowering branch of the pistillate tree, natural size. 
. Diagram of a flower. 
A staminate flower, enlarged. 
A stamen, enlarged. 
. A pistillate flower, enlarged. 
. Vertical section of an ovary, enlarged. 
. An ovule, much magnified. 
. A fruiting branch, natural size. 
. Vertical section of a fruit, enlarged. 
. Vertical section of a seed, enlarged. 
. An embryo, enlarged. 
. A winter branchlet, natural size. 
Puate XCVII. Acer Nercunpo, var. CALIFORNICUM. 
1. 
COMONA AE wh 
A flowering branch of the pistillate tree, natural size. 
A flowering branch of the staminate tree, natural size. 
. A pistillate flower, enlarged. 
A staminate flower, enlarged. 
. A fruiting branch, natural size. 
. Vertical section of a fruit, natural size. 
Vertical section of a seed, enlarged. 
. An embryo, enlarged. 
. A winter branchlet, natural size. 
