viii List of Illustrations 



PAGE 



7. Scotch Pine . . 129 



8. White Spruce . - . 131 



9.' Black Spruce . . . - 132 



10. Sitka Spruce ..''.'. 134 



11. Balsam Fir 136 



12. Alpine Fir . 137 



13. Amabilis Fir 138 



14. Lowland Fir . . > 138 



15. Douglas Fir . 140 



1 6. Western Hemlock '. 143 



17. Black Hemlock 143 



1 8. Western Larch : 145 



19. Alpine Larch ., 146 



20. White Cedar 148 



21. \Vestern Cedar 149 



22. Yellow Cedar 151 



23. Rocky Mountain Red Cedar 153 



24. Western Yew 155 



25. Peach-leaved Willow 159 



26. Western Willow .160 



27. Aspen 162 



28. Balsam Poplar 164 



29. Black Cotton wood 164 



30. Cottonwood 1 66 



31. Long-leaved Cottonwood 166 



32. \Vhite Birch 170 



33. Mountain Birch 171 



34. Red Alder 172 



35. Bur Oak 175 



36. Garry Oak 175 



37. White Elm 178 



38. Hackberry . 179 



39. Bird Cherry 182 



40. Western Bird Cherry 182 



41. Oregon Crab 183 



42. Mountain Ash . 184 



43. Manitoba Maple 188 



44. Mountain Maple . - 189 



45. Silver Maple 190 



46. Broad-leaved Maple . . . 190 



