CRUDE DRUGS. 595 



VI. LEAVES AND HERBS. 



Some of the most valuable and potent vegetable drugs are 

 those furnished by leaves and herbs. In quite a number of 

 instances the leaves alone are collected; not infrequently, as with 

 herbaceous plants, the leaves, together with the flowering and 

 fruiting tops, are collected; rarely, however, are the tops alone 

 employed; occasionally the drug may consist of the entire plant. 

 It may be noted in this connection that some of the so-called leaf- 

 drugs, as belladonna, hyoscyamus and stramonium, may contain 

 the tops of the plants as well, and some of the commercial herbs, 

 as lobelia, may consist entirely of leaves. 



KEY FOR THE STUDY OF LEAVES AND HERBS. 



I. Leaves. 



1. Whole Leaves. 



A. Texture coriaceous. 



a. Margin entire. 



" Glandular-punctate. 



Apex emarginate Pilocarpus 



Scythe-shaped Eucalyptus 



/3 Not glandular-punctate. 



Apex ohtuse Uva Ursi 



b. Margin dentate or serrate. 



Glandular-punctate Buchu 



Not glandular-punctate Chimaphila 



B. Texture not coriaceous. 



a. Margin entire. 



Not less than 15 mm. broad Coca 



Not more than 15 mm. broad Senna 



h. Margin not entire. 



Margin sinuate Hamamelis 



Margin crenulate Salvia 



2. Leaves crumpled or in broken fragments. 



A. Texture coriaceous. 



Upper surface resinous Eriodictyon 



B. Texture not coriaceous. 



a. Hairy. 



Surface reticulate, veins whitish Digitali.i 



Surface reticulate, veins brownish . . . ' Matico 



Surface not reticulate Hyoscyamus 



