584 



SCIENTIFIC AND APPLIED PHARMACOGNOSY 



pericycle occurs an interrupted circle of bast fibers occurring either 

 single or in small groups, the walls of which are relatively thin and 

 slightly lignified (Fig. 245); a few layers of leptome; xylem con- 

 sisting of a few tracheae associated with numerous wood fibers (Fig. 

 245) ; an internal phloem having small isolated groups of bast fibers 



B 



Vn/2& r 



JA*<cvV^ 



i**V^>HS^ 



FIG. 245. Belladonna: A, surface view of cells of the epidermis, showing also a 

 stoma. B, surface view of cells of the lower epidermis and 3 stomata. 

 C, a non-glandular hair. D, several types of glandular hairs. E, numerous 

 crystals of calcium oxalate in the form of sphenoidal microcrystals and small 

 prisms. F, fragment of xylem showing the wood fibers having simple pores, 

 and several tracheae with bordered pores and reticulate perforations. G, 

 transverse section of a portion of the stem showing thick-walled bast fibers. 



similar to those found in the inner bark; pith of large irregular paren- 

 chyma cells. 



Powder. (Fig. 245.) Dark green; especially characteristic of 

 the powder, cleared with solutions of potassium hydroxide or chloral 



