DUBOISIA 



601 



Allied Plants. Hyoscyamine is also found in Datura Stramonium, 

 Atropa Belladonna, Anisodus luridus, Duboisia myoporoides, Lactuca 

 sativa and L. virosa, the two latter plants belonging to the Com- 

 positae. Hyoscine (scopolamine) is also present in belladonna root, 

 the seeds of Hyoscyamus niger, the leaves of Datura Stramonium, 



FIG. 262. Hyoscyamus: a, surface view of cells of the epidermis, showing also 

 a single stoma; 5, surface view of cells of the lower epidermis and 2 stomata; 

 c, uniseriate non-glandular hairs; d, glandular hairs; e, monoclinic prisms of 

 calcium oxalate; /, fragment of xylem showing the wood fibers (w), and 

 tracheae having simple pores (p), bordered pores (s), and spiral thickenings 

 (I); g, three bast fibers in transverse section. 



Datura fastuosa of the East Indies, the leaves of Duboisia myo- 

 poroides and the roots of Scopolia japonica and S. atropoides. 



Duboisia leaves are obtained from|Duboisia myoporoides, a large 

 shrub indigenous to Australia. They are short-petiolate, 7 to 10 

 cm. in length, 1.5 to 2.5 cm. in breadth, having an acute or narrow 



