MOVEMENTS OF FLORAL ORGANS 



431 



an, is shown pressed closely 

 against the side of the bee's 

 abdomen. The stigma, st, is 



FIG. 332. Flower and stamens of common sage 



A, p, stigma; a, anthers. B, the two stamens in ordinary position; /, filaments; 

 m, connective (joining anther cells) ; a, a', anther cells. C, the anthers and 

 connectives bent into a horizontal position by an insect pushing against a. 

 After Lubbock. 



hidden within the upper lip of the corolla. In B, an older 

 flower, the anthers have withered and the stigma is now low- 

 ered so as to brush against the body of any bee which may 

 enter. A little study of Fig. 332 will make clear the way 

 in which the anthers are hinged, so that a bee striking the 

 empty or barren anther lobes, a, knocks the pollen-bearing 

 lobes, a', into a horizontal position, so that they will lie closely 

 pressed against both sides of its abdomen. Many stigmas, as 

 those of catalpa and trumpet creeper, close as soon as they 

 are pollinated. 



