Ox-eye daisy (Chrysanthemum leucanthemum)
Collins, 252; Readers Digest, 346
This is a cheerful medium to tall perennial that can be seen in the verges and hayfields of our downland. The leaves are dark green and the flower heads are like large daisies with a large yellow centre and daisy-like rays around the rim. It flowers from May to September and can, in places, be very abundant. It is also known as the Moon-Daisy or Dog-Daisy. An extract of the plant has been used to treat various ailments and juices from the stem of the plant were used as eyedrops. It has been severely affected by the use in Britain of selective weedkillers.
See also: http://www.botanical.com/botanical/mgmh/d/daisyo04.html