POPLAR. 267 
Plate 24. Populus deltoides. Cottonwood. 
1. Flowering branch of staminate tree, one-half natural size. 2. Flow- 
ering branch of pistillate tree, one-half natural size. 3. Scale of staminate 
catkin, enlarged. 4. Scale of pistillate catkin, enlarged. 5. Cross section 
of ovary, enlarged. 6. Fruiting branch, one-half natural size. 7. Mature 
fruit. 8. Seed, enlarged. 
