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PLATE VI 



I 



A. Tall, dense cottonwood and willow growth along dry bed of San 

 Luis Rey River, San Diego County, Calif. Much of the surface 

 flow sinks into the gravels and is absorbed by vegetation. 



B. Typical swamp area. Tules use large amounts of water. 



C. Tules 6 to 8 feet high, growing in open water. 



