HOTANY FOR BEGINNERS, 



Fig. 16. 



iCh.VI, 



J39. Tuberous roots, are hard, solid, and fleshy; they con- 

 sist of knobs called tubers. Some have but one tuber, as the 

 potato, which is shown at Fig. 16, a. In the artichoke, many 

 tubers are strung together by fibreSj as at b. In a kind of plants 

 called orchis, the root has two tubers, resembling the parts in- 

 to which a bean may be divided, as at c. You will perceive 

 that they all are furnished with radicles. The tuber is a reser- 

 voir for the nourishment collected by the radicles. Sucli roots 

 are knobbed, as in the potato; oval, as in the orchis j abrupt, 

 as in the plantain. 



140. Granulated roots consist of little bulbs or tubers 

 strung together by a thread-like radicle, as in Fig. 17. 



Fig. 17. 



139. What are tuberous roots 1 



140. What are granulated roots? 



