62 



ORGANOGRAPHY. 



pressed downwards, and the pistil protrudes in consequence 

 (Fig. 143, A). The stigma strikes the abdomen of the 

 bee, and the style also brushes against it. When the bee 



visits the next flower, the stigma 

 of that strikes the abdomen as 

 before, but it has been dusted 

 with pollen from the previous 

 flower, and of course a portion 

 of it is retained by the stigma, 

 thereby eflfecting cross-fertiliza- 

 tion. In like manner pollen 

 from that flower is carried to 

 the next, and so on. 



79. A slight variation from 

 the foregoing is seen in the 

 Eeau blossom, where the keel 

 is coiled into a snout (Fig. 144). 

 "Within this are the stamens, 

 also the pistil, with an oblique 

 stigma and hairy style (Fig. 

 145), the latter loosely retain- 

 ing the early discharged pollen. 

 When a bee, in alighting to 

 search for nectar, presses the 

 wing-petals downwards, the 

 stigma and hairy style, loaded 

 "3 with pollen, protrude, strik- 



ing the front part or siJe of the insect. Therefore 

 visiting a succession of flowers the bee transports pollen 



Figs. Ul-143. Papilionaceous flower of the Pea : 141. The flower entire : 142. 

 The alse, or wings, removed, exposing the keel ; 143. A, the keel depressed, causing 

 the stigma to protrude ; .5, the diadelphous filaments ; t», vcxiUum; «, ate; il,keel; 

 Jil, filaments. 



