1912] CHAMBERLAIN—CERATOZAMIA 3 
The trunk and leaves 
The trunk of Ceratozamia mexicana seldom reaches 2 meters in 
length. It is rather slender, has an armor of persistent leaf bases, 
Fic. 1.—Ceratozamia mexicana growing on a steep mountain side opposite 
Naolinco, near Jalapa. 
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and is often curved or prostrate. This habit is doubtless due to the 
fact that so many plants grow on steep slopes (fig. 1), for the apex 
