THE HOME OF THE NATIONAL GEOGRAPHIC SOCIETY 

 An Association organized for "the increase and diffusion of knowledge," with headquarters at Washington, D. C. 



THE PLANT WORLD 



A Magazine of General Botany Largely Devoted to Plant Geography 

 and Explorations. Profusely Illustrated. 



CJThe September number con- 

 tains the following articles : 



The Course of the Vege- 

 tative Seasons in South- 

 ern Arizona. By Dr. D. 

 T. MacDougal. 



Methods of Reproduction 

 in Guayule (a Mexican 

 Rubber Plant) and Ma- 

 riola. By Professor F.E. 

 Lloyd. 



The Western Edge of the 

 Colorado Desert. By 

 Prof. V. M. Spalding. 



Bower's Origin of a Land 

 Flora. By Dr. W. A. 



margin of the oasis of sonoyta. Cannon. 



^[Subscriptions, $1.50 per year. New subscribers remitting before January i 0, 1909, 

 will receive the November and December numbers free. Sample copies on application. 



THE PLANT WORLD, TUCSON, ARIZONA 



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