HYOSCYAMUS. 



191 



Fibres are not common. Fragments of spiral vessels 

 are not infrequent. Occasionally pollen grains may be 

 found in the powder. 



According to Tschirch, the crystals are diagnostic 



Fio. 49. — Hyoscyamus Leaf in Powder. 

 Epi. Epidermal cell with ST, stomata. and Gl. glandular hairs; G, 

 gland.s from the tips of the hairs; H, simple multicellular hair; PI, pali- 

 sade tissue, rich in chlorophyll; C. crystals of at least four shapes; V, 

 vessels from the ribs and petioles; those from the petioles maybe 

 reticulated; B, fibre from rib; P; pollen grains occasionally found. 



alone and serve as a means of differentiating this leaf from 

 other leaves of the narcotic group. Thus hyoscyamus 

 has at least four kinds of crystals ; stramonium has crystal 

 glands; belladonna, crystal sand; and digitalis, no 

 crystals. 



