ASARUM 



185 



cleft; fragments with tracheae showing close annular or reticulate 

 thickenings of the wall. 



FIG. 77. Asarum. Transverse section of the rhizome showing a uniseriate non- 

 glandular hair (a); epidermal layer (6); several layers of collenchymatous 

 cells (c); starch-bearing parenchyma of cortex (e); oil cells with suberized 

 walls (d) ; endodermis (/) ; trachea (g) with spiral or scalariform thickenings 

 of the wall and associated with small tracheids; starch-bearing parenchyma 

 of pith (h). After Bastin, Amer. Jour. Pharm., 1894, p. 574. 



Allied Plants. The rhizome of a related species, Asarum euro- 

 pseum, a common plant of the mountainous regions of Europe, is 



