784 BOTANY AND PHARMACOGNOSY. 



214. CYDONIUM. (See No. 80.) 



215. RHUS GLABRA. Brownish-red (Fig. 285. /) ; non- 

 glandular hairs unicellular, narrow, thick-walled, filled with air, or 

 multicellular, cylindrical, ellipsoidal or spatulate and with a wine- 

 colored pigment; glandular hairs with i-celled stalk and multi- 

 cellular globular or ellipsoidal head, with yellowish-brown con- 

 tents ; stone cells about 20 /jl in diameter, thick-walled, strongly 

 lignified, with numerous pores ; oil globules numerous. 



216. ROSA CANINA (or Rose Hips). Dark brownish- 

 red ; non-glandular hairs of torus unicellular, from 0.5 to 2 

 mm. long, about 35 fx wide, gradually tapering toward the base 

 as well as apex, with very thick walls and narrow lumen ; paren- 

 chym.a cells with brownish-red masses of plastids ; calcium oxalate 

 crystals in rosette aggregates from 35 to 50 /x in diameter ; scleren- 

 chymatous cells and fibers of seed-coat with colorless, rather thick 

 walls and numerous simple and branching pores ; an inner epi- 

 dermis of elongated cells containing a brown pigment ; the cells 

 of the embryo with small, nearly spherical aleurone grains and 

 considerable oil. 



217. WILLOW CHARCOAL. Wine-colored or dark red- 

 dish, or blackish, irregular-shaped fragments, composed of woody 

 tissues. Willow charcoal is frequently used to color cattle-foods, 

 particularly those the basis of which is wheat-middlings. 



B. STONE CELLS WANTING. 



a. WITH WOOD FIBERS. 



218. H^MATOXYLON. Reddish ; tracheae with simple 

 pores ; sclerenchymatous fibers long, thin-walled ; crystal fibers 

 with monoclinic crystals of calcium oxalate. 



219. SANTALUM RUBRUM. Reddish; trachese with bor- 

 dered pores ; sclerenchymatous fibers long, thin-walled ; crystal 

 fibers with monoclinic crystals of calcium oxalate. The coloring 

 principle is insoluble in water but soluble in alcohol and solutions 

 of the alkalies. 



b. WOOD FIBERS WANTING, 



220. CROCUS. (See No. 85.) 



221. KINO. (See No. 209.)^ 



