68O FAMILIES, OF ANGIOSPERMS. 



SUGGESTIONS FOR STUDY OF THE STRAWBERRY. 



1171. The strawberry (Fragaria 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? 



How does seed distribution come about in such plants as the strawberry ? 

 How are strawberry plants usually propagated? 



Material. Entire plants with runners; flowers; fruit. 



1172. Lesson XIII. Plums, cherries, pears, apples. The 

 almond or plum family (Drupaceae). The members of this 

 family are trees or shrubs. The common choke-cherry (fig. 

 569) will serve to represent one of the types. The flowers of 

 this species are borne in racemes. The receptacle is cup-shaped. 

 Only one seed in the single carpel (sometimes two carpels) 

 matures as the calyx falls away. The outer portions of the 

 ovary become the fleshy fruit, while the inner portion becomes 

 the hard stone with the seed in the center. Such a fruit is a 

 drupe. 



The floral formula for this family is as follows: 



Ca5,Co5,Ai5-2o or 30,01. 



The apple family (Pomacese). This family is represented 

 by the apples, pears, quinces, June-berries, hawthorns, etc. 



