LESSONS WITH PLANTS 



351 



sfith him such food and other useful plants as can be raised 

 n the new region to which he moves. Thus wheat and other 

 ;rains have been brought westward from the cradle of civiliza- 

 ion in Central Asia, and our Indian com, potato, and to- 

 )acco have been carried to the eastern hemisphere. 

 But with the intentional introduction of useful plants the 



Fig. 146. The Bright Scarlet Fruit of the Waahoo Remains on the Bushes 

 Long after the Leaves have Fallen and thus Attracts the Birds. 



eeds of harmful weeds have also been brought in. Thus 

 he Russian "thistle" was brought over from Russia with 

 ome seed wheat. Many other weeds such as daisy, dan- 

 lelion, hemp, plantain, and corn-cockle were brought from 

 Europe, generally unintentionally. 



Water-fowl no doubt aid in the distribution of many marsh 

 ,nd water-plants. The wild rice, for example, is carried on 

 he feet, bills, plumage, in the crops of ducks, geese, and other 

 irater-fowl, and is scattered on their wanderings. 



