6o 



BOTANY. 



EXERCISE XXIV. 



The Union of Floral Whorls with each other. 

 There is, perhaps, no part of the study of plant-forms 

 that will tax your patience as much as the subject of this 

 exercise. 



Try first to determine the insertion of the corolla. 

 Compare the arrangement of parts in each of your 



flowers with that 

 shown in Fig. 185, 

 and, when you find 

 the corolla insert- 

 ed below the ova- 

 ry, and free from 

 the calyx, label the 

 specimen corolla, 

 hypogynous. 



Examine the 

 remainder of your 

 flowers, and, when 

 you find one with 

 the corolla insert- 

 ed, as shown in Fig. 186, say corolla upon the calyx, or 

 perigynous. 



How is the corolla inserted in Fig. 187? Point out 

 upon the charts instances where the corolla has a similar 

 insertion. 



Look at the flowers not yet described, and, if you find 

 cases where the corolla is inserted upon the ovary, describe 

 them as epigynous, from <?//', upon, and gynia, pistil (Fig. 1-87). 

 If not quite certain about these characters in your 

 specimens, write your label with a mark of interrogation, 

 to show doubt. Do not be discouraged if these points of 

 structure remain for some time troublesome ones to dis- 

 cover. Try to find them out, and, if you succeed, it is 

 well ; but if you fail, your labor will not be lost. 



FIG. 185. Corolla, hypogynous. 



