1904] MAC DOUGAL— DELTA AND DESERT VEGETATION 63 



the only species offering anything of the nature of water- storage 

 organs outside of the Cacti. 14 



The region under discussion offers matchless opportunities for 

 comparison of the most highly developed xerophytic types of the 

 desert with the broad-leaved forms of the delta which root in the 

 mud. Midway between the two are the species which stand in the 

 moist soil of the delta, and have foliage suitable to endure the extreme 

 aridity of the air, which constantly blows from the desert over the 

 entire delta. 



New York Botanical Garden. 



M MacDougal, D. T., Some aspects of desert vegetation. Plant World 6:249- 



2 57- IO °3- 



