A TEXT-BOOK OF BOTANY 



impossible to remove from the soil all of the indefinitely 

 branching rhizomes, and any nodes that remain are able 

 to send up fresh crops of aerial branches. In many cases 



FIG. 62. Rootstock of a Juncus, showing how it advances beneath the ground 

 and sends up a succession of branches; the breaking up of such a rootstock only 

 results in separate individuals. 



only a single aerial branch is sent up each year, as in wild 

 ginger, Solomon's seal (Fig. 63), iris, bloodroot, etc.; in 



others, leaves 

 and flowers 

 may be sent up 

 separately by 

 the rhizome. 

 In the com- 

 mon ferns, it 



FIG. 63. Rootstock of Solomon's seal, showing terminal Will be noted, 

 bud, the base of this year's aerial branch, and scars of 



the branches of three preceding years. After GRAY. 



^Jjg QQ _ called 



fronds are sim- 



ply large leaves developed directly by the rhizome. Per- 

 haps even more familiar is the extensive rhizome system 



