PANAX REPENS 



477 



walls having large pores and reticulate thickenings; the parenchyma 

 of the cortex contains considerable starch and calcium oxalate in 

 the form of rosette aggregates; in among the. parenchyma cells 

 occur large schizogenous oil canals, containing a yellowish oil, and 

 are usually surrounded with eight secretion cells; the tracheae or 

 vessels show either simple or bordered pores and reticulate thicken- 



B 



FIG. 205. Panax repens: A, rhizome showing prominent nodes and scars of the 

 over-ground stems. B, transverse section of the outer portion of the 

 rhizome showing cork (K), parenchyma with reticulate thickenings of the 

 walls (NP), and secretion reservoirs (Se). C, transverse section of the woody 

 portion showing the trachea? (H) and wood fibers (F). After Rosenthaler 

 and Stadler. 



ings; the wood fibers are about 0.560 mm. in length and 0.015 to 

 0.025 mm. in width; the parenchyma of the pith contains consider- 

 able starch. Saponin occurs in some of the parenchyma cells of 

 cortex and pith and its presence may be determined by giving a 

 violet-red color with concentrated sulphuric acid. 



