PLATE V 



29. Cut-leaved Birch. 90. ( l / 3 ) 



30. Sassafras. 12. (V 5 ) 



31. American Elm. 36. (Vs) 



32. Slippery Elm. 37. (i/ 4 ) 



203 



36 



33. Sweet Gum. 87. (V 3 ) 



34. Common Aspen. 24. (*/ 6 ) 



35. Large-toothed Aspen. 25. (i/ 3 ) 



36. Downy-leaved Poplar. 26. (V 8 ) 



