WILD YELLOW LILY 



113 



The ovule has a short stalk or funiculus attached to the 

 placenta. From the apex of the funiculus, the chalaza, two 

 integuments arise. These completely surround the ovary 



FIG. 67. Lilium canadense. The upper figures show a pollen mother 

 cell, its division into two, then into four cells each of which develops into a 

 pollen grain. The lower figure is a longitudinal section of an anatropous 

 ovule showing the large central megaspore. 



except at the apex where a small opening or micropyle 

 remains. The integuments inclose the nucellus in which is 

 imbedded the macrospore. 



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