Grade. 

 Date. . 



EXERCISE 3 



FLOWER PARTS 



Object. To understand the flower and its parts. 



Definitions. Taking any simple flower such as the nasturtium, geranium, 

 or morning glory, the instructor should point out the location and uses of the 

 following parts: Sepals, petals, stamens, carpels, pistil, filament, anther, 

 ovary, style, stigma, receptacle (Fig. 2). 



FLOWER COROLLA CALYX PISTIL STANEN 



STIGMA * ANTHER 

 - FILAMENT 



PETAL 



Fia. 2. Parts of a complete flower. 



Drawings. Parts should be labelled by ruling a line from the part to 

 the name of the part in the column at the right. Draw all parts large. 



1. Carefully pull away the petals. Draw a petal. 



2. Pull off the sepals, leaving only stamens and pistils. Draw sepal. 



3. Take off the stamens. Draw a stamen showing filament, anther and 

 anther lobes. 



4. Only the pistil remains. Draw this showing ovary, style and stigma. 

 Application. 1. How is a grain or pod related to the parts of a flower? 



2. What is a cross-fertilized flower? A self-fertilized flower? What 

 crops belong to each class? 



3. What effect do the relative positions of the stigma and anthers have 

 on fertilization? 



4. Describe the corn flower. Why are certain rows of corn some- 

 times detasseled? 



5. How do insects help in the production of seeds? 



Reference. Percival, J., 1915, Agricultural Botany (Holt), 78-88. Cook,, 

 M. F., 1919, Applied Economic Botany (LIPPINCOTT). 



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