CHAPTER II 
THE PARTS OF A FLOWERING PLANT 
13. Fundamental Terms. The plants with which we 
are most familiar (flowering plants) are composed of 
various parts, such as leaves, roots, tendrils; and each 
FIG. i. A cactus plant (Rhipsalis pachyptera) with leafless stem. 
The branches are flattened, thus exposing more green tissue to the light 
in the absence of leaves. 
part has its special work to perform. The various parts 
of a plant having their own special work are called organs, 
and the special work of an organ is its function. Since 
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