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TREES OF MINNESOTA. 



Plate 52. Acer negundo. Box Klder. 



1. Flowering branch from staminate tree, one half natural size. 2. Flower- 

 ing branch from pistillate tree, one-half natural size. 3. Diagram of flower. 4. 

 Staminate flower. 5. Pistillate flower. 6. Longitudinal section of ovary, enlarged 

 7 Fruiting branch, one half natural size. 8. Longitudinal section of fruit, one- 

 half natural size. 9. Embryo, enlarged. 



