186 FLOWERS 



staminate and pistillate flowers occur upon the same plant, 

 as in squash, the plant is moncecious; when the staminate and 

 pistillate flowers occur on different plants, as in the willows, 



FIG. 115. Gynandrous stamens of moccasin flower (Cypripedium acaule) 



the plant is dioecious. Both staminate and pistillate flowers 

 are imperfect. When the flower has the same number or a 

 multiple of the same number of parts in each circle it is 

 symmetrical; when the number is not the same in each circle 



