688 



SCIENTIFIC AND APPLIED PHARMACOGNOSY 



Constituents. A bitter, amorphous, dark-colored substance; 

 inulin about 25 per cent; a volatile oil; an enzyme; levulose; 

 choline; p-hydroxyphenylacetic acid; 3 : 4-dihydroxycinnarnic acid; 



FIG. 303. Taraxacum: A, transverse section of root showing cork (fc), paren- 

 chyma containing inulin (p), laticiferous vessels (I), phloem groups (s) com- 

 posed of sieve and laticiferous vessels, cambium (c), tracheae (<), modified, 

 non-lignified wood fibers (Ersatzfa'sern) (w). B, longitudinal section of 

 xylem showing several of the reticulate trachea? and the modified wood fibers 

 with oblique pores that are apparent in preparations, made with chlor-zinc- 

 iodide. C, longitudinal section of a phloem group showing branching laticif- 

 erous vessels (I), sieve cells (s), and parenchyma (p) containing sphere 

 crystals of inulin. 



a mixture of fatty acids; two new monohydric alcohols, taraxas- 

 terol and homotaraxasterol ; and a substance which had been desig- 



