l6 GENERAL BIOLOGY 



Guards against waste of nectar by rain. 



Guards against the ingress of ill-adapted visitors. 



Position of the nectaries. 



[ number. 

 Stamens *j arrangement (in pairs, in whorls, etc.) 



( included or exserted. 

 Pollen (dry, sticky, etc.) 

 Guards against self- j f structure, 

 fertilization in > -I position, 

 stigma or anther ) [ movements. 

 First ready for fertilization, anther or stigma. 

 The student will use this table for recording his observa- 

 tions on the ten or more species of flowers selected, which 

 should include the following floral types: 



1. A simple open solitary flower. 



2. A tubular or bellshaped, loosely clustered flower. 



3. A spurred or saccate flower. 



4. A strongly bilateral mint flower. 



5. A papilionaceous flower. 



6. An umbelliferous flower. 



7. A malvaceous flower. 



8. A composite flower (see fig. 236.) 



Interpretation of the table. The student should write out 

 the principal conclusions that can be drawn from the facts 

 included in the completed table. In doing this he should 

 consider the facts of each column by themselves, and after- 

 wards, looking for correlated characters, he should compare 

 the columns together. For example, he will be able to see 

 in the several columns what forms of flowers cluster and of 

 corolla; what colors, guide-marks, scents; what rain guards, 

 etc. prevail: but it is only by carefully comparing columns 

 together he will learn which of the flowers show fewest 

 adaptations to insect visitors, which of the tubular and 

 which of the bilateral flowers show most adaptations, and 



