94 LABORATORY PRACTICE 



III. Coalescence between the pistils of a flower is ex- 

 tremely common, giving rise to what is called a compound 

 pistil, or one in which the number of styles, stigmas, cells of 

 the ovary, or placentae exceed one. 



Take the flower of a Lily or a Hyacinth and notice : 



1. The number of stigmas. 



2. The number of styles. 



3. Cut across the ovary and notice the number of cells and 



placentas. Draw a diagram of this cross-section. 



4. It will be seen, then, that the compound pistil of this 



flower is made up of three coalescent simple pistils 

 or carpels. 



IV. In the pattern flower we noticed that all the parts 

 of the flower were inserted upon the receptacle and that the 

 parts of different circles were not united in any case. Some- 

 times the parts of different circles are united. When this is 

 the case, it is called adnation. 



V. Examine the flower of some species of Fuchsia 

 (with single flowers) or some species of Evening Primrose 

 (CEnothera^. Notice : 



1. The calyx (synsepalous), colored (i.e. not green), with 



four lobes. 



2. The petals, grown to (" inserted upon") the calyx. This 



is a case of adnation. 



3. The stamens, also inserted upon the calyx. 



4. The ovary, bearing the " tube " of the calyx upon its 



summit. 



VI. Try and find cases of adnation in the flowers you 

 may see, and notice the differences between the different 

 flowers. 



