HABITS OF WEEDS 91 



to some part of a selected host plant and steadily rob their 

 victim of food. A bad attack of dodder may utterly ruin a 

 clover crop by the constant sapping of strength consequent on 

 the loss of nutritive substances. Yellow rattle, broomrape, 

 and bartsia are the other most familiar parasites, but they are 

 all sufficiently important to demand more extended notice. 

 (See Chapter VI.) 



