THE NEOTROPICAL REGIONS 



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developed. In the zone between 500-1,000 metres, a true tropic-i I 

 rain-forest is found. This zone is rich in palms (Acrocomia, Sabal, 



Hi 



m 



to 



Fig. 79. — Tree cactus (Pachyccreus Pringlei), near Libertad, Mexico. Photo., 



Dr. W. S. Cooper. 



Oreodoxa, etc.), and among the characteristic forest trees are 

 giant silk-cottons (Bombax), laurels, Terebinthaceae, Combreta- 

 ceae, and others. In some places fertile savannas occur. 



The great volcano Orizaba offers a fine example of the zoning of 

 vegetation from the rank tropical jungle at its base, to the regions 



