36 ELEMENTS OF STRUCTURAL BOTANY. 



found to be attached to the calyx. They are, therefore;, 

 perigynous. 



49. To understand the construction of the pistil, you 

 must make a vertical section through the roundish green 

 mass which you will find on the under side of the flower. 



You will then have presented to 

 you some such appearance as that 

 in Fig. 44. The green mass, you 

 will observe, is hollow. Its outei 

 covering is simply the continua- 

 tion of the calyx-tube. The lin* 

 ing of this calyx-tube is the recep- 

 44> tacle of the flower ; to it are at- 



tached the separate carpels which together constitute the 

 pistil (Fig. 45), just as the carpels of the Buttercup are 

 attached to the raised receptacle of that flower. 



We must remind you again that whenever the ovary is 

 enclosed in the calyx-tube, and the calyx appears to spring 

 from the summit of the ovary, the latter is said to be 

 inferior, and the former superior. 



In the case of Sweet Brier and similar forms, 

 where the pistil is strictly apocarpous, and the 

 other parts cohere at their base so as to form 

 a tube enclosing the really free carpels, the 

 pistil may be described as half-inferior, and 

 the calyx consequently as half -superior. 



50. Strawberry. So far as calyx, corolla, and sta- 

 mens are concerned, the flower of Strawberry very 

 nearly resembles that of Sweet Brier. Alternating with 

 the five calyx-lobes, however, will be found five bractlets, 



Fig. 44. Vertical section through the pistil. 



Fig. 46. Vertical section through ripe fruit of Sweet Brier. 



