This section is from the book "A Text-Book Of Pharmacology, Therapeutics And Materia Medica", by T. Lauder Brunton. Also available from Amazon: A text-book of pharmacology, therapeutics and materia medica.
The wild-grown, flowering herb of Viola tricolor.
Characters. - Stem angular and nearly smooth; leaves alternate, petio-late, ovate or oblong, crenate, with leaf-like, pinnatifid stipules; flowers with an obtuse spur, and the variegated petals shorter or longer than the calyx; inodorous; taste somewhat bitter and acrid.
Dose. - 15 to 75 gr. (1-5 gm.) in decoction.
Composition and Action. - It contains a little violine, a substance similar to emetine, and having an emeto-cathartic action.
Uses. - It is used externally in the form of an ointment or a poultice in eczema and impetigo. It is sometimes given internally in bronchitis.