Pool : THE VEGETATION OF THE SANDHILLS OF NEBRASKA 245 



slender rhizomes through the sand and firmly binding the open soil 

 with its radially spreading network o£ wiry rhizomes and fine roots. 

 Sometimes Psoralca lanceobta is a companion in this early work and 

 with its similar type of propagation this species aids materially in 



Fig 12. Blow-out grass, Redfieldia flexuosa, showing habit and details. An 

 erect stem, o; rhizome, b\ spikelet, c; single lemma and palea 

 showing fringe of hairs, d. Criginal. 



the fixation of unstable sands. The wirelike rhizomes of Redfieldia 

 are usually encountered at a depth of from 4 to 12 inches. Naturally 

 this varies somewhat with reference to wind action since during a 

 number of days of high wind the rhizomes may actually be uncovered 

 in certain more exposed spots in the blow-out. From these rhizomes, 



