Pirate X. 



Fi}!-. 1. Extensive tract of blowsand in tlie Ociunwka area near Keitlisburg'. 



Fig-. 2. Development of the .S';!6'«o/4i'////i association in a shallow blowout, Hanover area. 

 The conspicuous erect plants are Oenothera rhonibipetala. 



