POWDERED DRUGS AND FOODS. 72J 



B. CALCIUM CARBONATE WANTING. 



a. GLANDULAR AND NON-GLANDULAR HAIRS PRESENT. 



a Fragments of Pappus Present. 



31. EUPATORIUM. Dark green; non-glandular hairs of 

 two kinds, 2- to 8-celled, thin-walled, finely striate, one kind with 

 acute end-cell and the other with rounded end-cell; glandular 

 hairs either 6- to 8-celled in a double row, and with 2-celled 

 glandular head, or short-stalked and with 4- to 1 2-celled gland- 

 ular head ; pollen grains ellipsoidal, 10 to 20 /* in diameter and 

 with numerous centrifugal projections; pappus occurring as a 

 multicellular axis about 30 fx in diameter and with short uni- 

 cellular alternate branches ; ducts spiral, annular, or with bordered 

 pores ; sclerenchymatous fibers thin-walled, non-lignified, with 

 few, simple, oblique pores. 



32. GRINDELIA. Light green ; tracheae spiral, annular, or 

 with bordered pores, strongly lignified ; sclerenchyma fibers thin- 

 walled, non-lignified, with numerous simple more or .less oblique 

 pores ; pollen grains spherical, about 25 fx in diameter, with 

 numerous centrifugal projections ; glandular hairs depressed, glob- 

 ular, multicellular ; numerous oil globules and resin masses ; 

 pappus consisting of a multicellular axis with minute teeth. 



P Fragments of Pappus Wanting. 



33. DIGITALIS. Dark green (Figs. 284, E ; 287, A) ; non- 

 glandular hairs simple, consisting of 2 to 5 superimposed cells, 

 straight or slightly curved ; glandular hairs with i-celled stalk 

 and I- to 2-celled glandular head; stone ce}ls, star-shaped hairs 

 and calcium oxalate crystals wanting (Figs. 266; 285, D). 



Adulterants. The leaves of Matico (see No. 40) have 

 numerous stomata and the non-glandular hairs are from 2- to 6- 

 celled. The leaves of Salvia Sclarca (Fam. Labiatae) have non- 

 glandular hairs somewhat resembling Digitalis, but the gland- 

 ular hairs are of the labiate type with large, 8-celled, glandular 

 heads. The leaves of Verhascum Phlomoides (Fam. Scrophu- 

 lariaceae) have multicellular, branching, non-glandular hairs re- 

 sembling those of V. thapsiis (Fig. 283, C), and small glandular 



