THE SANDHILLS SUBCLIMAX. 



69 



well captured by a dense and nearly pure growth of this sand-binder. This 

 plant has a great abundance of tough, wiry, and very much-branched rhizomes, 

 2 to 4 mm. in diameter, which form an underground network connecting the 

 apparently isolated plants. These rhizomes are thickly covered with long 

 scales and tipped with buds about an inch in length with very sharp, hard 

 points. This branched network of rhizomes may be formed in the soil at al 



