64 



Elementary Work in Botany. 



an anther (see the figure of a mustard flower), and the stem 

 a filament. Find on the anther pollen grains. The pollen 

 grows inside the anther. Note that the anther consists of 

 two sacs or cells which open to let the pollen out. In a bud 

 the anther is full and in an old flower it is empty. Remove 



the stamens. The pis- 

 til has an enlarged 

 base called the ovary, 

 a neck or stem called 

 the style, and one or 

 more stigmas at the 

 top. In a mustard 

 flower there is one 

 stigma; in a geranium 

 five; in an eschscholtzia 

 there are really but 

 two, each divided into 

 several slender parts; and in any wild morning-glory there 

 are two stigmas. Cut across the ovary and find the ovules 

 (the beginnings of seeds). If you have eschscholtzias or 

 morning-glories Fig. 50 will help you in studying them. 

 Bring for the next work a bunch of geraniums. 



EXERCISE 36. 



Study of a Geranium. The sepals of a flower taken 

 together are called the calyx. Note that the upper sepal is 

 larger than the others. The petals form the corolla. Like 

 the calyx the corolla is slightly irregular or one-sided. 



Fig. 49. Mustard flower magnified with four of the 

 stamens, three petals and three sepals removed. 



