THE WORK OF LEAVES 223 



wood, Ragweed, Boneset, etc.). There can, therefore, 

 be no doubt of the efficiency of this kind of protection. 



(c) Woody, leathery texture, as in Rushes (or flinty, 

 as in Horse-tails) , is a means of protecting many plants, 

 a fact which is familiar to all. 



(d) Hugging the ground is a very successful device 

 employed by plants, such as Knot-grass, Cinquefoil, 

 Purslane ("Pusley"), Wild Strawberry, etc. 



