’ 
+ 
38 _ BOTANY FOR BEGINNERS, LCh. VI. 
Fig. 16. 
139, 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 fibres, as at b. In akind of plants 
called orchis, the root has two tubers, resembling the parts in- 
to which a bean may be divided, as atc. 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. 
wevemere 
139. ‘What are tuberous roots ? 
140, What are granulated roots? 
