xvi TREES 



Unarmed. 



46. Leaves alternate, or clustered on alternate spurs. 47. 

 Leaves opposite, or 4-ranked if separated. 117. 



Leaves in whorls of 3, large. p. 138. Catalpa. 



Leaves alternate. 



47. Leaves small and very narrow: fruit a cone. 48. 

 Leaves comparatively large. 50. 



Simple. 



48. Leaves on slender deciduous twigs. p. 11. Taxodium. 

 Leaves clustered on short stout spurs. 49. 



49. Scales of cone persistent. p. 8. Larix. 

 Scales of cone deciduous. Pseudolarix. 



50. Leaves fine-nerved from the base. p. 4. Ginkgo. 

 Leaves netted-veined. 51. 



51. Leaves simple. 52. 

 Leaves compound. 99. 



52. Stipule-scars encircling the twig. 53. 

 Stipule-scars 1 distinctly shorter, or buds sharp. 56. 



53. Leaves entire: sap not milky. p. 42. Magnolia. 

 Leaves lobed. 54. 



54. Buds 2-edged: sap not milky. p. 41. Liriodendron. 

 Buds not flattened. 55. 



55. Sap milky: buds not fluted. p. 32. Ficus. 

 Sap not milky: buds fluted. p. 52. Platanus. 



56. Bud& with a single scale, in front. p. 19. Salix. 

 Buds naked or else with several visible scales. 57. 



57. Buds fusiform, spreading, spine-like. p. 27. Fagus. 

 Buds not at all spine-like. 58. 



58. Silvery- or brown-scurfy. p. 107. Elaeagnus. 

 Mucilaginous, aromatic: twigs green. p. 44. Sassafras. 

 Neither scurfy nor very mucilaginous. 59. 



59. Leaves 2-ranked, at least on spreading branches. 60. 

 Leaves not 2-ranked, but sometimes in 1 plane. 77. 



60. Leaves palmately nerved. 61. 

 Leaves pinnately veined. 66. 



61. Sap milky but sometimes scant. 62. 

 Sap not milky. 63. 



