24 



MORPHOLOGY 



dus), keshur (Scirpus grossus), are known by the 

 name of tuber. In fact, tubers are swollen under- 

 ground bfanches or parts of branches. They bear on 

 them buds known as "eyes". These eyes develop 

 into aerial shoots during the following season. Bulb 

 is the name given to that kind of underground stem 



Fig. 20. — Potato Plant or AIoo, showings Tubers 



which is really a thickened underground bud. It 

 consists of a small slightly convex disk-shaped stem 

 closely invested by large and overlapping fleshy 

 scales in which food-materials are stored. Small 

 bulbs or bulblets are present in the axils of some of 

 the scales. In the growing season the short disk 

 grows into an aerial flowering shoot. Onion (fig. 21), 

 rasun or Garlic, rajani-gandha or Tuberose (Poly- 



