The dried rhizome and rootlets of Arnica montana. Middle and Southern Europe and Northwest of the United States.

Characters. - Rhizome, cylindrical, contorted, rough from the scars of the coriaceous leaves, of which some usually remain attached, and furnished with numerous long, slender fibres; has a peppery taste and peculiar odour.

Composition. - Arnicin, a substance having some of the properties of a glucoside. Arnica also contains about one per cent. of an essential oil, with a considerable quantity of inulin.

Arnicae Rhizoma B P Arnicae Radix U S P Arnica Rhi 304

Fig. 205. - Arnica, half the natural size.

Adulteration. - Sometimes adulterated with other and similar roots. These may be distinguished on close inspection.

Preparations.

B.P.

Dose.

Tinctura Arnicae (1 oz. to 1 pint).........................................

30 min. to 1 fl. dr.

U.S.P.

Extractum Arnicae Radicis.....................................................

5 10 gr.

,, ,, ,, Fluidum.......................................

10-30 min.

Tinctura ,, ,, ...................................................

2-5 fl. dr.

Emplastrum Arnicae .............................................................