POPLAR. 



2<i7 



Plate 24. Popitiits dclloidcs. Cottonwood. 



i. 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. 



