FOIl BEGIN>uR4. 

 Fig. 16. 



|Ch.VI. 



139, Tuberous roots , are hard, solid, and fleshy; thay con- 

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

 pu'ato, which is shown at Fig. 16, a. In the artichoke, many 

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

 called orchis, the root has two tub.ers, 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. Such roots 

 are knobbed, as in the potato} oval, as in the orchis ; 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. 



139. What are tuberous roots 1 



140. Wha> * re granulated roots? 



