72 PLANT BIOLOGY 



which together are known as the stigma, and 

 the remainder of the pist| known as the ovary. 

 Describe the pistil of the tulip (and of the tril- 

 lium) as to position, shape, and color of its parts. 



6. Make a drawing twice its natural size of the pistil. 



Label stigma, ovary. 



7. Cut thin cross sections of a well-developed ovary, 



lay them on a dark-colored background, and 

 study one or more of them with a magnifier to 

 make out the following parts : wall of the ovary, 

 small objects within the ovary known as ovules. 

 (These ovules develop into seeds.) Describe 

 what you have done and tell what you have seen. 



8. Make a drawing at least an inch in diameter of a cross 



section of the ovary, labeling ovary wall and 

 ovules. 



9. (Optional.) Make a drawing (corresponding in size to that 



called for in 6 above) of a lengthwise section of the 

 ovary to show wall of ovary, ovules. Label. 



85. Study of the gladiolus flower (autumn study). Lab- 

 oratory Study No. 42. 



Note to the teacher. Be careful to remove each flower 

 close to the central stalk, so that the ovary may not be in- 

 jured. 



A. Parts of the flower. 



1. Remove the two leaves at the base of the flower, since 



these leaf -like organs do not belong to the flower. 

 The outer brightly colored parts of the flower are 

 called the floral envelopes. These colored parts 

 unite to form a greenish tube below. 



a. Count and record the number of divisions of which 

 the floral envelopes are composed. 



6. State whether or not these divisions are all of the 

 same size. 



2. The slender stalks with purple tips, inside the floral 



envelopes, are called stamens. How many sta- 

 mens do you find? 



