520 POWDERED DRUGS 



B ALPHABETICAL LIST OF DRUG POWDERS WITH SYN- 

 OPSIS OF ESSENTIAL MICROSCOPICAL ELEMENTS 



(For more detailed description of the microscopical elements see U.S.P.) 



146.* ACONITE 



powder. -Grayish-brown; starch grains, nearly spherical, simple or 2 to 5 

 compound (3 to 15 n in diam.) ; stone cells, large, tabular, irregular, or elongated to 

 fibers; yellowish-brown cork fragments, few; tracheae, spiral, reticulate or with 

 bordered pits; parenchyma, relatively thick- walled, filled with starch. 



341. ALTHAEA 



Powder. White or light yellow; starch grains, numerous (5 to 20 n in diam.), 

 calcium oxalate crystals in rosette aggregates (15 to 35 n in diam.); bast fibers in 

 groups, sometimes not strongly lignified, tracheae scalariform or with bordered 

 pits; numerous parenchyma fragments with large mucilage cells. 



381. ANISUM 



Powder. Yellowish-brown, fragments of pericarp showing portions of yellow 

 oil reservoirs numerous; small tracheae accompanied by sclerenchyma fibers; endo- 

 sperm cells filled with aleurone (about 6/u in diam.), each containing a rosette crys- 

 tal of calcium oxalate (about 2 /* in diam.) ; i -celled hairs up to 2000 n long, having 

 slight projections on the surface; the endocarp is characteristic. 



565. ARNICA 



Powder. -Yellowish-brown, pappus consists of multicellular axis with unicellu- 

 lar branches; non-glandular hairs i- to 6-celled, glandular hairs of three kinds, 

 with unicellular stalk and unicellular head; a 4-celled stalk and unicellular head, or 

 a lo-celled stalk of a double row of cells with a 2 -celled head; pollen grains numer- 

 ous, spherical (25 to 35 n in diam.) 



42. AMYLUM 



Powder. White, starch grains, polygonal, rounded or spherical (3 to 35 /* in 

 diam.) with central cleft 3 to 5 rayed. 



12. ASPIDIUM 



Powder. Greenish or brown; starch grains, numerous, oval or oblong (5 to 15 

 H in diam.) in characteristic clumps; fragments of parenchyma sclerenchyma fibers 

 and tracheids numerous; and characteristic brown fragments of the endodermis. 



447. ASPIDOSPERMA 



Powder.~R.ed dish-brown; starch grains, spherical, ovoid or plano-convex (3 to 

 25 n in diam.); bast fibers, long accompanied by crystal fibers; stone cells in large 

 groups; cork cells sometimes Sgnified; calcium oxalate in prisms or pyramids (8 

 to 30 /* long). 



278. AURANTII AMARI CORTEX 



Powder. Yellowish to light brown, consists mostly of parenchyma with occa- 

 sional membrane crystals of calcium oxalate (4 to 30 n long) ; tracheae, few small, 

 spiral or with simple pores. 



504. BELLADONNA FOLIA 



Powder. -Green, consists mostly of irregular leaf fragments; calcium oxalate 

 small in small aggregates or wedge-shaped micro-crystals; hairs, few, the non- 

 glandular 2 to 5 cells, the glandular with I- to 3-celled stalks and heads one to many 



'Numbers refer to No. of drug in Part II. 



