MANUAL OF NATURE STUDY. 
151 
Polypetalous or gamopetalous ? If gamopeta- 
lous, what is the 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¬ 
posite. 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- 
