

Fig. 18!). Two plaiitH of the giant cactus. Note tlie llutcd, cliinigy l)r;incluiij;, K';if- 

 less bodies growiii;^ from tlie rocky, sterile soil characteristic of cactus deserts. 

 Certain dry-ground grasses and low, sbrubl:'y plants with suuill leaves may be seen 

 in (lie foreground. 



