Viola pedata L. Engl.: bird-foot violet, blue violet.
Classic texts: Journals: TNEMA 1882-1883.
Classic texts: Scudder's Materia Medica, 1898: Emetics.
Classic texts: USDisp 1918.
Classic texts: King's 1898.
Henriette's herbal is one of the oldest and largest herbal medicine sites on the net. It's been online since 1995, and is run by Henriette Kress, a herbalist in Helsinki, Finland.