144 BOTANY AND PHARMACOGNOSY. 



tion to the insects which visit them. The insects are, however, 

 probably more attracted by the odor and food products which 

 they obtain, such as the nectar. The nectar is secreted by 



Fig. 88. A, flowering and fruiting plant of peanut {Arachis hypogcea). The flower- 

 stalk after fertilization grows in length, sometimes 4 to 8 cm., and curves downward pene- 

 trating the soil (el), after which the fruit develops. ' B, longitudinal section through the 

 papilionaceous (bilateral) flower; C, longitudinal section through the pod (peanut). — 

 After Taubert. 



