274 Plant-Breeding 



divided into three parts, but when the flower first opens, 

 these parts are closed together, H in flower A, so that it 

 is impossible that they receive any pollen from the same 

 flower; when the stamens have withered, however, as in 

 B, the stigma, H, spreads open and is ready to receive 

 any pollen which may be brought to it by insects or 



FIG. 84. Flower of the shrubby hibiscus (Hibiscus syriacus). 



other agencies. In this case, the ovary or young seed-pod, 

 which is hi the bottom of the flower, is not shown in the 

 engraving. 



Some of the particular forms of essential organs are 

 well illustrated in the accompanying photographs. In 

 the night-blooming cereus, Fig. 83, the many-rayed stigma 

 is shown just below the center of the mouth of the flower, 



