CLASSIFICATION OF ANGIOSPERxMS. 555 



Fig. 311. Pitcher Plant {Sarracenia purpurea). The plant grows in peat boRS. and 

 the pitcher-shaped leaves are usually half filled with water and serve as a trap for insects, 

 which are finally digested and furnish the plant with nitrogenous food. The flowers arc 

 single on a naked scape and of a deep purple color, the petals being arched over the style. 

 Many species of Sarracenia are prized by horticulturists because of their odd trumpet- 

 shaped leaves. — After Troth. 



acid has been found in D. longifolia, a sundew common in the 

 United States as well as in Europe and Asia, (r) The family 

 Nepenthace^ contains the single genus Nepenthes, seveial spe- 



