410 



PARASITES AND CARNIVOROUS PLANTS 



*r 



f 



FIG. 312. Sundew (Drosera rotundifolia) 



common American pitcher plants depend for nourishment on 

 the drowned insects in the pitchers is not definitely known, but 

 it is certain that some of the tropical species require such food. 1 



1 Where the Sarracenia is abundant it will be found interesting and profit- 

 able to make a careful class study of its leaves. See Geddes, Chapters in 

 Modern Botany, Chapters i and n. 



