PLATE L. SMOOTH ALDER. 



1. Winter branch showing buds, (s) staminate catkins, (p) pistillate catkins, x J. 



2. A mature staminate catkin, x |. 



3. Mature pistillate catkins, x i. 



4. Branch with leaves and fruit, x i. 



5. Branch with mature fruit strobiles, x i. 



6. A strobile scale with seeds, slightly enlarged. 



7. A winged seed, enlarged. 



8. Section of winter branch showing stalked bud, lenticels, leaf-scar with bundle-scars, 



enlarged. 



9. A leaf-scar, enlarged. 



10. Cross section of branch showing triangular pith, enlarged. 



