POPLAR. 263 
Plate 23. Populus balsamifera. Balm of Gilead. 
1. Flowering branch of staminate tree, one-half natural size. 2. Fiow 
ering branch of pistillate tree, one-half natural size. 3. Fruiting branch, 
one-half natural size. 4. Scale of staminate catkin, enlarged. 5. Scale ot 
pistillate catkin, enlarged. 6. Scale without flower, displayed, enlarged. 7. 
Mature fruit. 8. Seed, enlarged. 9. Longitudinal section of seed, en- 
larged. 10. Embryo, enlarged. 11, Winter branch showing buds, one-half 
natural size, 
