MANUAL OP NATORE STUDY. 151 



Polypetalous or gamopetalous ? If gamopeta- 

 lous, what is tlie form of the corollo ? Is its form 

 favorable to self-fertilization ? Explain fully. 

 Notice its color as to whether it would be attrac- 

 tive to insects. Notice its odor and nectar, guides 

 and cups, and state whether you think these would 

 assist in insect fertilization? Does the corolla serve 

 as a protection to the reproductive organs ? How ? 



Describe the stamens, especially in their relation 

 to the stigma, which must also be described. No- 

 tice whether the stamens and pistils are equally 

 fresh and vigorous at same moment of time. If so, 

 what conclusion as to their adaptability for self- 

 fertilization ? Do the stamens look fresh and vital 

 and the stigma limp and withered? If" so, what 

 inference as to the ability for self-fertilization? 

 Are the stamens withered while the stigma yet re- 

 mains fresh and erect ? Give inference. 



Is the pollen of a kind that will admit of wind- 

 fertilization? Now review all the parts about the 

 flower that offer any inducements to insects, and 

 state all the points favorable to insect-fertilization. 



3. Study clustered flowers leading to the com- 

 positse. This study includes the whole topic of 

 Inflorescence, or mode of flower arrangement. 



Flowers are said to be indeterminate when they 

 are situated in the axils of leaves, as in shepherd's 

 purse ; and determinate when they are from termi- 



