FERTILIZATION OF FLOWEES. 229 



yellow, colors best seen at night, and in addition usually are 

 very strongly scented so as to attract the night-flying moths 

 which usually fertilize them. Sometimes dull-colored flowers, 

 which frequently have a very offensive odor, are visited by 

 flies and other carrion-loving insects, which serve to convey 

 pollen to them. 



Occasionally, flowers in themselves inconspicuous are sur- 

 rounded by showy leaves or bracts which take the place of 

 the petals of the showier flowers in attracting insect visitors. 

 The large dogwood (Fig. 110, J), the calla, and Jack-in-the- 

 pulpit (Fig. 86, A) are illustrations of this. 



