604 



SCIENTIFIC AND APPLIED PHARMACOGNOSY 



vascular bundles of the veins in the form of sphenoidal microcrystals; 

 non-glandular hairs usually only present on the younger leaves, 

 uniseriate, consisting of 2 to 5 cells and from 0.200 to 0.500 mm. in 

 length, the lower cells being very broad and the cuticle throughout 

 being very papillose; glandular hairs few, with 1- to 2-celled stalks 

 and usually 2- to 4-celled, glandular heads; tracheae annular or 

 spiral, fragments of the tracheal wall frequently detached; stomata 



FIG. 264. Breeding plot of Stramonium at the Experimental Farm of Eli 

 Lilly & Company, Indianapolis, Ind. 



elliptical, about 0.025 mm. in length and having 3 to 5 neighboring 

 cells; cells of the mesophyll containing numerous small chloroplastids. 

 Constituents. The important constituents of Stramonium leaves 

 are similar to those of belladonna' leaves, the amount of total alka- 

 loids, however, being about one-half less (0.2 to 0.4 per cent). The 

 substance known as daturine is a mixture of hyoscyamine and atro- 

 pine, the former being in excess (see Belladonnse Folia and Hyos- 

 cyamus). Stramonium leaves also contain a volatile oil, resin, and 

 yield about 17 per rent of ash, containing considerable potassium 

 nitrate. 



