112 Elementary Principles of Agriculture 



these brightly colored parts as sign-boards directing 

 it to the nectar below. The pleasant scent or odor 

 serves the same purpose. 



166. There are five petals in the peach-blossom, all 

 separate, but in the morning-glory they are united. 

 Whether united or separate, taken together they are 

 termed corolla. (Fig. 53.) Just below the corolla there are 

 usually five small green leaves which are named sepals, 

 and, when taken together, the calyx. The corolla and 



Peach-blossom cut open, to show the parts of Calyx and corolla of Morn- 



the flower. ing-Glory. 



[Fig. 53. Peach-blossom and morning-glory. 



calyx were called the floral envelope by the older botan- 

 ists. Inside of the corolla are a number of small yellow- 

 ish masses on slender stalks. These yellowish bodies are 

 called pollen cases, or anthers. When ripe, they produce 

 the fine yellow dust, or pollen. In the center of the whorl 

 of stamens is the pistil. There are three parts in the 

 pistil. At the top it usually has a slightly knob-like 

 portion called the stigma, covered with a thick, gummy 

 liquid. The stigma is sticky, to catch and germinate the 

 pollen brought from its own or other flowers. Below 

 the stigma is a. slender portion, the style, and then the 

 swollen base, the ovary. The ovary is the part that 



