Fig. 67. Twig from Flower-Cluster of Yucca Whipplei 



1, Bud; 2, flower open; 3, flower open previous night, but now closed; 4, the little white moth 

 Pronuba yuccasella, flying to the flower; 5, the moth pushing down ball of pollen into the 

 funnel of stigma; 6, stigma enlarged. (After Kerner) 



