INULA 



of cork rectangular or somewhat polygonal, and having relatively 

 thin brownish-walls, the cells usually containing a granular cyto- 

 plasm and a nucleus; small groups of narrow, elongated sclerenchy- 

 matous fibers; fragments of resin canals with thin-walled epithelial 

 cells. 



FIG. 304. Elecampane (Inula Helenium): A, one of the smaller leaves near the 

 inflorescence. B, under surface of the leaf. C, hairs of leaf. D, transverse 

 section of petiole showing parenchyma (p), lignified bast fibers (6), sieve (s), 

 tracheae (<), and somewhat thickened cells of wood (w). E, F, G, successive 

 stages in the development of the intercellular or schizogenous oleo-resin 

 canals of very young roots. H, sphere-crystals of inulin as seen in the root 

 after treatment with alcohol. 7, single sphere-crystal. 



Constituents. Inulin from 35 to 45 per cent; from 1 to 2 per 

 cent of alantol, a crystalline or somewhat oily substance, consisting 

 chiefly of alantolacton and small quantities of alantolic acid, alantol 



