93 



cape since the hairs ail point in one direction. The flower 

 is a trap and the insects are prisoners for one or more days. 

 Some nourishment is found, but in the course of time the 

 stamens mature and the anthers dehisce and a large amount 

 of the pollen drops on the floor of the cavity. This food is 



FIG. 38. 

 Fig. 38. Bitrhwort (Ariatiilochia elematitis). I. Infloresance. II. Transverse 

 section before poUiuation. III. After potUnation, s, throat, r, tube h, 

 hairs, r, expansion of tube of calyx, u, stigma, a, anthers, b, ovary. (Aft- 

 er Behrens.) 



welcomed by the insects but they soon become restless and 

 in their endeavor to escape become dusted with pollen. The 

 time has about arrived for the insects to be liberated. The 

 hairs wither and now the insects can escape; at the same time 

 the peduncle bends over so that the flowers drop. The 

 prisoners escape, go to the younger flower, leave some pol- 

 len on the stigma and when the stamens dehisce, after im- 

 prispnraent, are liberated again. 



Elaeagnus angustifoUa. This beautiful 



Blaeaguaceae. 



European shrub is related to our north- 



western BuflFalo Berry (Elaeagnus argp.ntea Pursh.) It has 



