Fig. 31. 



Fig. 33. 



37 



Napiform root. 



Fusiform root 



Fig. 34. 



Tap root. 



of natural growth, being almost uniformly produced by cultiva- 

 tion. 



(5.) The Fusiform Root, or Radix fusiformis : where the root 

 tapers toward each extremity, as seen in the Radish, it is known 

 by the above name. Fig. 32. 

 * (6.) The Napiform Root is that variety which is very large 

 at the base, but tapers abruptly, as in the Turnip, Fig. 33. 



The three preceding varieties are generally called, in distinc- 

 tion from the other varieties, simple roots, the most of the root 

 being confined to the main axis, and sending off few small fibers. 



(7.) The Filiform Root consists of a single filament, and is the 

 root of some floating plants, as the Lemna. 



(8.) Didymous Roots are those which 

 produce a tubercle each year, and when 

 the tubercle of one year arrives at 

 nearly the dimensions of the one of the 

 preceding year, they answer to the form 

 indicated by the term applied to them ; 

 that is, double or twin roots. The Orchis 

 affords examples of this variety, Fig. 34. 



(9.) The Pa.lmated Roots are such as 

 differ from the preceding only in hav- 

 ing the lobes divided, giving them somewhat the appearance of 

 a hand. The Orchis affords examples of this variety. 



68. The following varieties are generally classed as either 

 stems or buds, but are, in common parlance, called roots, and 

 we know of no disadvantage in complying with the popular 

 arrangement by describing them under this organ. 



Didymous roots. 



"What is a fusiform root ? What a napiform ? A filiform ? Didymous f 

 Palmated ? — 68. How are the remaining varieties classed ? 



