1. White Fir, Abies concolor Images from http://www.forestryimages.org/

2. Grand Fir, Abies grandis Images from http://www.forestryimages.org/

3. Sugar Maple, Acer saccharum Images from http://www.forestryimages.org/

4. European Alder, Alnus glutinosa Images from http://www.forestryimages.org/

5. Black Mangrove, Avicennia nitida Images from http://www.forestryimages.org/

6. Yellow Birch, Betula alleghaniensis Images from http://www.forestryimages.org/

7. Pignut Hickory, Carya glabra Images from http://www.forestryimages.org/

8. Pecan, Carya illinoensis Images from http://www.forestryimages.org/

9. Alaska Cedar, Chamaecyparis nootkatensis Images from http://www.forestryimages.org/

10. American Beech, Fagus grandifolia Images from http://www.forestryimages.org/

11. White Ash, Fraxinus americana Images from http://www.forestryimages.org/

12. Oregon Ash, Fraxinus latifolia Images from http://www.forestryimages.org/

13. Green Ash, Fraxinus pennsylvanica Images from http://www.forestryimages.org/

14. Black Walnut, Juglans nigra Images from http://www.forestryimages.org/

15. Tamarack, Larix laricina Images from http://www.forestryimages.org/

16. Western Larch, Larix occidentalis Images from http://www.forestryimages.org/

17. Sweetgum, Liquidambar styraciflua Images from http://www.forestryimages.org/

18. Yellow Poplar, Liriodendron tulipifera Images from http://www.forestryimages.org/

19. Water Tupelo, Nyssa sylvatica Images from http://www.forestryimages.org/

20. Engelmann Spruce, Picea engelmannii Images from http://www.forestryimages.org/

21. White Spruce, Picea glauca Images from http://www.forestryimages.org/

22. Black Spruce, Picea mariana Images from http://www.forestryimages.org/

23. Blue Spruce, Picea pungens Images from http://www.forestryimages.org/

24. Sitka Spruce, Picea sitchensis Images from http://www.forestryimages.org/

25. Jack Pine, Pinus banksiana Images from http://www.forestryimages.org/

26. Lodgepole Pine, Pinus contorta Images from http://www.forestryimages.org/

27. Shortleaf Pine, Pinus echinata Images from http://www.forestryimages.org/

28. Slash Pine, Pinus elliottii Images from http://www.forestryimages.org/

29. Western white pine, Pinus monticola Images from http://www.forestryimages.org/

30. Longleaf pine, Pinus palustris Images from http://www.forestryimages.org/

31. Ponderosa Pine, Pinus ponderosa Images from http://www.forestryimages.org/

32. Red Pine, Pinus resinosa Images from http://www.forestryimages.org/

33. Eastern White Pine, Pinus strobus Images from http://www.forestryimages.org/

34. Loblolly Pine, Pinus taeda Images from http://www.forestryimages.org/

35. Virginia Pine, Pinus virginiana Images from http://www.forestryimages.org/

36. Sycamore, Platanus occidentalis Images from http://www.forestryimages.org/

37. Eastern Cottonwood, Populus deltoides Images from http://www.forestryimages.org/

38. Quaking Aspen, Populus tremuloides Images from http://www.forestryimages.org/

39. Black Cherry, Prunus serotina Images from http://www.forestryimages.org/

40. Douglas Fir, Pseudotsuga menziesii Images from http://www.forestryimages.org/

41. White Oak, Quercus alba Images from http://www.forestryimages.org/

42. Southern Red Oak, Quercus falcata Images from http://www.forestryimages.org/

43. Bur Oak, Quercus macrocarpa Images from http://www.forestryimages.org/

44. Cherrybark Oak, Quercus pagoda Images from http://www.forestryimages.org/

45. Northern Red Oak, Quercus rubra Images from http://www.forestryimages.org/

46. Black Oak, Quercus velutina Images from http://www.forestryimages.org/

47. Redwood, Sequoia sempervirens Images from http://www.forestryimages.org/

48. Giant Sequoia, Sequoiadendron giganteum Images from http://www.forestryimages.org/

49. Baldcypress, Taxodium distichum Images from http://www.forestryimages.org/

50. Western Red Cedar, Thuja plicata Images from http://www.forestryimages.org/

51. Eastern Hemlock, Tsuga canadensis Images from http://www.forestryimages.org/

52. American Elm, Ulmus americana Images from http://www.forestryimages.org/