MARYLAND GEOLOGICAL SURVEY 269 



20. Blue Beech Carpinus caroliniana. 



21. Beech Fagus atropunicea. 



22. Chestnut Castanea dentata. 



23. White Oak Quercus alba. 



24. Post Oak Quercus minor. 



25. Chestnut Oak Quercus primis. 



26. Swamp White Oak Quercus platanoidex. 



27. Red Oak Quercus rubra. 



28. Scarlet Oak Quercus coccinea. 



29. Yellow Oak Quercus velutina. 



30. Pin Oak Quercus palustris. 



31. Barren Oak Quercus pumila. 



32. Slippery Elm Ulmus pubescens. 



33. American Elm Ulmus americana. 



34. Hackberry Celtis occidentalis. 



35. Red Mulberry Jforus rubra. 



36. Cucumber-tree Jfagnolia acuminata. 



37. Tulip-tree Linodendron tulipifera. 



38. Pap aw Asimina triloba. 



39. Sassafras Sassafras sassafras. 



40. Witch Hazel Hamamelis virginiana. 



41. Sycamore Platanus occidentalis. 



42. Sweet Crab Pyrus coronaria. 



43. Serviceberry Amelanchier canadensis. 



44. Cockspur Crataegus crus-galli. 



45. Scarlet Haw Crataegus coccinea. 



46. Pear Haw Crataegus tomentosa. 



47. Small-leaf Haw Crataegus uniflora. 



48. Wild Plum Prunus americana. 



49. Wild Red Cherry Prunus pennsylvanica. 



50. Sour Cherry Prunus cerasus. 



51. Black Cherry Prunus serotina. 



52. Redbud Cercis canadensis. 



53. Honey Locust Oleditsia triacanthos. 



54. Locust Robinia pseudacacia. 



55. Ailanthus Ailanthus grandulosa. 



56. Staghorn Sumach Bhus hirta. 



57. Dwarf Sumach R7ius copallina. 



58. Mountain Maple Acer spicatum. 



59. Striped Maple Acer pennsylvanicum. 



60. Sugar Maple Acer saccharum. 



61. Silver Maple Acer saccharimtm. 



62. Red Maple Acer rubrum. 



63. White Basswood Tilio heterophylla. 



64. Dogwood Cornus florida. 



65. Black Gum Nyssa sylvatica. 



66. Mountain Laurel Kalmia latifolia. 



67. Rhododendron Rhododendron maximum. 



68. Persimmon Diospyros virginiana. 



69. Black Ash Fraxinus nigra. 



70. White Ash Fraxinus americana. 



71. Green Ash Fraxinus lanceolata. 



72. Nannyberry Viburnum prunifolium. 



GENERAL DISTRIBUTION OF FOREST TREES. 



The limitation of certain trees to particular areas forms somewhat 

 conspicuous features in the composition of the forests of this region. 

 There are, of course, no very sharp lines of separation between the 



