Key to the Genera. 
Leaves linear. : 
Leaves in fascicles. I. Pinus, p 
Leaves alternate. 
a. tetragonal. 2. Picea, p 
b. flattened. 3. Abies, p. 
Leaves apparently 2-ranked. 
a. bluish-white beneath. ¢. Tsuga, p 
b. green on both sides. 
I, trees. 5. Taxodium, p. 
2, shrubs. 9. Taxus, p. 
Leaves awl-shaped, 5-ranked. Cryptomerza, p 
Leaves minute, scale-like. 
Boe 
80. 
» 83. 
84. 
94- 
. 89. 
Cone-scales basifixed. 6. Thuja, p. 87. 
Cone-scales peltate. 7. Chamecyparis, p. go. 
Cones berry-like. 3. Juniperus, p. 92. 
Leaves ample, fan-shaped. Ginkgo, p. 95. 
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