LECT. IV.] THE ROOT. 141 



to form a connected whole, with rootlets pro- 

 ceeding from each joint. The articulations are in 

 some instances kneed ; in others they resemble 

 nodules or beads. 



The following may be considered species of the 

 jointed root : 



1 . The Simple Articulated root, when the pieces 



/. of which it is 



composed are 

 attached lon- 

 gitudinally, or 

 nearly so, as 

 in Wild Gin- 

 ger, Asarum 

 Canadense (fig. 

 Z). 



2. The Kneed root (Radix genlculata) has some 



of the articulations form- 

 ing a knee ; as in Hedge 

 Hyssop, Gratiola offici- 

 nalis ; and Solomon's 

 Seal, Convallaria poly- 

 gonatum (fig. /*), which 

 is, besides, a bulbife- 

 rous root, and truncated 

 in such a peculiar man- 

 ner at the points of de- 

 tachment of the annual 

 stems, as to have given rise to its vulgar name ; 



