SOAP ROOT 



201 



I,..- 



FIQ. 86. Saponaria officinalis. A, showing the thick, branching, horizontally 

 creeping rhizome (stolon), producing numerous buds (B) and ramifying 

 roots (T) at the nodes; R, base of a long thick secondary root; St, an ascend- 

 ing stolon which has not yet reached the surface of the ground. B, trans- 

 verse section of an apical internode of a stolon, showing epidermal cells 

 (Ep), the inner collapsed portion of cortex (C), and the outermost layer of 

 pericycle consisting of sclerenchymatous fibers (St). C, transverse section 

 of apical internode of a stolon, showing the innermost layer of sclerenchy- 

 matous fibers of the pericycle (St), underneath which is the underlying cork 

 (Co); phelloderm (Ph) and leptome (L). D, transverse section of part of a 



