LEAVES AND HERBS. 
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leaves, together with the flowering and fruiting tops, 
are collected; rarely, however, are the tops alone em- 
ployed ; 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. Nearly entire. 
A. Texture coriaceous. 
a. Margin entire. 
a Margin revolute. 
Apex emarginate Pilocarpus 
Apex obtuse ... Uva Ursi 
18 Margin not revolute. 
Scythe-shaped Eucalyptus 
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 
b. 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 Digitalis 
Surface not reticulate Hyoscyamus 
b. Not hairy. 
Margin entire Belladonnse Folia 
Margin sinuate Stramonii Folia 
