1904] MAC DOUGAL—DELTA AND DESERT VEGETATION 63 
the only species offering anything of the nature of water-storage 
organs outside of the Cacti.™4 
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 BoranicaL GARDEN. 
™ MacDovuaat, D. T., Some aspects of desert vegetation. Plant World 6:249- 
p g 
257. 1903. 
