WEEDS 179 



it first comes up, in the stage shown in figure 95. No- 

 tice the different forms of the leaves on the same plant 

 at this stage. 



When the pastures dry up, the burs often cover the 

 ground, sometimes an inch deep, and the cattle eat 

 them and grow fat on this "dry pasture. 77 Sheep are 

 kept away from such pastures, because the burs damage 

 the wool. 



Annual grasses. The darnel or poison darnel is a 

 weed in grain fields, and many people believe that it 

 changes itself into wheat, barley, oats, or whatever the 

 grain may happen to be in which it is growing. This 

 is a popular error, as hard to get rid of as the weed 

 itself. 



The "foxtail," or " barley grass," which works itself 

 into clothing, into the wool of sheep, and into the nos- 

 trils and ears of animals, is one of the barley grasses, 

 and not a true foxtail grass. 



PERENNIAL WEEDS 



Perennial weeds are the hardest to get rid of. If the 

 tops are cut off just as often as they show themselves 

 . above ground, and this be kept up for a season or so, the 

 weed will disappear. But it will not do to let them get 

 even a slight start, or all the work may go for nothing. 



White morning-glory, or bindweed. This is one of 

 the worst perennial weeds. Its long underground 



