INJURIOUSNESS OF WEEDS 



683 



12. POISONOUS WEEDS. 

 There are many weeds which are injurious to man and to ani- 

 mals because they are poisonous. One of the best known illustra- 

 tions is the cowbane, one of the most deadly poisonous plants in the 

 state; then there are jimson weed, also poisonous; and poison ivy, 

 which is poisonous to the touch. 



A large number of weeds, while not strongly poisonous, are in- 

 jurious ; some taint cow 's milk ; some are injurious because of spines 

 and prickles and thorns. This subject has been treated in full in a 

 large book by the writer, "A Manual of Poisonous Plants." Too 

 little attention has been paid by the school teachers of the state to 

 the subject of poisonous plants. 



Fig 531. Poison Ivy. Leaves poisonous to many people when they come In 

 contact with the plant. 



