BIRCH. 



Plate 27. Betula lutca. Yellow Birch. 



i. Flowering branch, one-half natural size. 2. Staminate flower, en- 

 larged. 3. Pistillate flower, enlarged. 4. Fruiting branch, one-half nat- 

 ural size. 5. Nut, enlarged. 6. Scale of iruiting catkin, enlarged. 7. Wm- 

 ver branch, showing staminate catkin, one-half natural size. 



