FLORAL MECHANISMS 119 



and Ladies. In America we find the same thing 

 recurring in the Dutchman's pipe. 



DUTCHMAN'S PIPE Aristolochia Sipho or Macrophylla 

 May-June 



The extraordinary shape of the flower is per- 

 fectly understood from its name. The front of 

 the "bowl" is brown, flat, and three-lobed. In the 

 centre of this is a small opening giving entrance 



DUTCHMAN'S PIPE 



to a chamber which curves downward and then up- 

 ward. The stamens and the pistil are at the further, 

 upturned end. The pistil is the first to perfect, 

 and thus receives pollen brought from another 

 flower by early small insects such as gnats and flies. 

 These, however, are not able to crawl or fly out 

 the way they came, and are held prisoners till in 

 due time the anthers shed their pollen. Then the 

 tube of the flower withers and hangs limply down- 



