268 PLANT FAMILIES: DICOTYLEDONS. 



(upon the gynoecium) by the fusion of the receptacle with the 

 carpels. The floral formula is thus Ca5, Cos, A 10-5-5 or 



Fig. 230. 

 Flower of pear. (After Warming.) 



1 0-10-5, G1-5. The carpels are united, but the styles are free. 

 In fruit the united carpels fuse more or less with the receptacle. 

 Omit either the strawberry, or the apple, as an exercise, if 

 desired. 



Exercise 76. 



430. The strawberry (Frag-aria vesca). 



Describe the appearance of the entire plant. What different stems are 

 there ? What purpose does each kind of stem serve ? Sketch and describe a 

 leaf. 



The inflorescence. — What is the kind of inflorescence ? 



The flower. — Determine the parts of the flower present. Describe each 

 set of members of the flower, naming the kind of calyx and corolla. Are the 

 sets of members free ? Are the members of each set distinct ? To take the 

 flower as a whole in its young condition (just opening) what is the relation as 

 regards position and elevation of the different sets to each other? Is the 

 flower perigynous or hypogynous ? 



What is the end of the stem called to which the parts of the flower are 

 attached ? 



Do all the flowers of the strawberry form fruit ? When you have deter- 

 mined this, determine the reason if you can. 



The fruit. — What parts of the flower are united to form the fruit? What 

 is such a fruit called ? What part of the flower forms the fleshy part of the 

 fruit ? What parts of the flower are united in the seed ? What is such a 

 seed called ? 



