THE AMERICAN BOTANIST 



89 



are found in cultivation in the warmer parts of the world or in 

 greenhouses elsewhere. 



The cacti are not without their arborescent forms as our 

 illustrations show. The stems of such forms are for the most 

 part pulpy, like the smaller species, the fibrovascular bundles, 



There appear to be an abundance of thick 

 and leathery leaves. 

 (Courtesy of Guide to Nature) 



often as large as broomsticks, forming a framework on which 

 the other tissues of the stem are arranged. All the work of 

 food-making goes on in the stem, the outer layers of which are 



