There is a charming story about Rhiwallon of Myddvai who was the son of a poor cowherd and the Lady of Llyn-y-Van-Vach. This local lady of the Lake was a beautiful girl who after various appearances on and disappearances into, the lake that was her home, abandoned it and settled down with her cowherd husband to whom she brought great wealth. Her father, however had stipulated that she would have to return to the lake if her husband struck her without anger three times. The husband was very careful but over a period of years, a playful slap with the gloves and two other equally playful gestures finally cost him his wife. She had in the meantime bore him three sons of whom Rhiwallon was the eldest. The boys had been told of their mother and used to wander by the lake in hopes of seeing her. One day she appeared to Rhiwallon and told him that he was destined to benefit mankind by relieving pain and curing illness. She pointed out the various herbs to him and explained their healing virtues. That son became a physician to the Lord of the manor,Rhys. Rhyss gave him a castle called Myddvai and he traveled forth all over the country side curing people and building up a reputation. He was one of the few earlier physicians who advised cleanliness as a good way to avoid illness.It was most likely his bias in favor of cleanliness that helped account for his many successes. His son followed him in the profession and on May 12,1842, Rice Williams M.D., died at the age of eighty-four, the last, although not the least eminent of physicians descended from the mysterious Lady of Llyn-yu-Van-Vach. Six hundred years of medical practice in one family. An extraordinary record. Useful to the physicians of Myddvai, the daisy had another virtue of great importance to them. It could tell if a patient would live or die.
Take the flower of the daisy and pound it well with wine, if the patient vomited he would live.
Thank you http://www.sfheart.com/ for the legends of the daisy.