PLATE V 



39. Cut-leaved Birch. 90. (V3) 



30. Sassafras. I3. (Ve) 



31. American Elm. 30. O/3) 



32. Slippery Elm. 37- (V*) 



33. Sweet Gum. 87. (Vb) 



34. Common Aspen. 24. ('/^) 



35. Large-toothed Aspen. 35. (Vs) 



36. Downy-leaved Poplar. a6. (Vg) 



203 



