POWDERED DRUGS AND FOODS. 



747 



not usually very numerous ; papillse of corolla and stigma ; scler- 

 enchyma fibers lo fi wide, the walls of which are very much 

 thickened ; small rosette aggregates of calcium oxalate some- 

 times present ; characteristic cells of anther. 



Fig. 296. A, Crocus (Spanish saffron) showing two spherical pollen grains, a fragment 

 of stigma with papilte, and fragment of an anther; B, Calendula showing 3 spinose pollen 

 grains and fragment of corolla, the cells of which contain oil-like globules; C, Carthamus 

 (so-called American saffron) showing 2 slightly spinose pollen grains and a fragment of 

 the corolla with brown laticiferous vessels and numerous unicellular hairs. After Weakley. 



87. CHIRATA. Dark yellow ; tracheae spiral, scalariform or 

 with simple pores ; sclerenchymatous fibers long, narrow, thick- 

 walled, more or less lignified. and with oblique pores ; parenchy- 

 matous cells of pith large, slightly lignified, and with numerous 



