426 Plant-Breeding 



Relative maturity of pistil and anthers. 



1. Both maturing at same time. 



2. Stigma matures first protogyny. 



3. Anthers mature first protandry. 



Methods of pollination. 



1 . Insects. 



2. Wind. 



3. Water. 



4. Self-pollination. 



Types of plants in regard to sex. 



1. Monoecious (both sexes on same plant). 



2. Dioecious (each sex on different individuals within the 

 species or variety). 



3. Polygamous (perfect and imperfect flowers on the same plant) . 



Types of flowers in regard to sex. 



1. Imperfect (1) Staminate bearing only stamens. 



(2) Pistillate bearing only pistils. 



2. Perfect or hermaphroditic bearing both stamens and 

 pistils. Determine the following : 



(a) Number of parts of flower. 



a, sepals ; b, petals ; c, stamens ; d, pistils. 

 (6) Type of flower perfect (hermaphrodite) or imperfect. 



(c) Relative position of stigma and anthers. 



(d) Relative maturity of pollen and stigma. 



(e) Is the flower pollinated by insects, wind, or self ed ? 

 (/) Draw the essential organs and label each part. 



EXERCISE 10 



Technique of the Cross-pollination of Plants 

 This exercise may be carried out in the winter in a green- 

 house or conducted in the fall and spring out of doors, where 



