712 BOTANY AND PHARMACOGNOSY. 



b. Wood fibers wanting. — Continued. 



Characteristic odor 223. Opium 



Epidermal cells with papillae 224. Rosa Gallica 



Fragments of anthers 225. Rosa Centifolia 



Long, slender styles 226. Zea 



POWDERS OF A WHITISH APPEARANCE. 



I. Plant Tissues or Cell-Contents recognizable. 



A. Containing starch. 



a. Only unaltered starch grains present. 



Excentral and fissured point of origin of growth. 



227. Maranta Starch 

 Excentral and circular point of origin of growth. 



228. Potato Starch 



Polygonal grains 229. Corn Starch 



Small, polygonal, compound grains 230. Rice Starch 



Ellipsoidal, point of origin of growth indistinct. 



231. Wheat Starch 



Characteristic grains 232. Other Starches 



h. Altered and unaltered starch grains present. 



Becomes pasty on addition of cold water 233. Dextrin 



Becomes pasty with hot water 234. Sago 



Disintegrates with water 235. Sago (Imitation) 



c. Plant tissues in addition to starch. 



a Do not readily dissolve or swell in cold water. 



Polygonal starch grains 236. Corn Meal 



Free from hairs 237. Corn Bran 



Starch grains S to 40 i« in diameter. . . .238. Wheat Flour 

 Hairs with thick walls and narrow lumen. 



239. Wheat Middlings 

 Starch grains 20 to 60 /» in diameter .... 240. Rye Flour 

 Thin-walled hairs with large lumen. 241. Rye Middlings 

 Starch grains 5 to 25 M in diameter. . .242. Barley Flour 

 Sclerenchyma fibers with brown contents. 



243. Buckwheat Flour 



Starch grains 2 to 10 1" in diameter 244. Rice Flour 



Hairs broader near the middle 245. Oat Meal 



Lignified hairs, starch grains few 246. Nux Vomica 



Characteristic starch grains 247. Orris Root 



Very long prisms of calcium oxalate 248. Quillaja 



Raphides of calcium oxalate i.249. Bryonia 



Aromatic odor 249a. Calamus 



Thin-walled bast fibers 249b. Ulmus 



