192 



TREES OF MINNESOTA. 



Plate 23. Populus balsamifera. Balsam Poplar. 



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

 branch of pistillate tree, one-half natural size. 3. Fruiting branch, one-half 

 natural size. 4. Scale of staminate catkin, enlarged. 5. Scale of pistillate cat 

 kin, enlarged. 0. Scale without flower, displayed, enlarged. 7. Mature fruit. 

 8. Seed, enlarged. <J. Longitudinal section of seed, enlarged. 10. Embryo, en- 

 larged. 11. Winter branch showing buds, one-half natural size. 



