Hieracium murorum L. Engl.: wall hawkweed.
Classic texts: John Hill 1812.
Classic texts: King's 1898.
Sign up here!
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.
Plant Healer Magazine: Very relevant to the practitioner.