Daisy, the common name of several flowers of the composite family. The word daisy is a contraction of day's eye, referring to the flower's sunlike appearance. Ray flowers (commonly called petals) surround a golden center of tiny disk flowers, an arrangement typical of the composite family. Each thin stem bears a flower head and has widely spaced, saw-toothed leaves. Some daisies open their petals in the morning and close them at night.Shasta Daisies
The English daisy, native to Europe but established in North America as a weed, has white, pink, or purple ray flowers. The flower head is about two inches (5 cm) across and the plant grows to a height of three to six feet (90 to 180 cm) or more. The oxeye daisy (also called the white daisy) is a species of chrysanthemum. It is native to Europe and Asia, but is common in North America, where it grows in fields and along roadsides. Its rays are white and it grows one to three feet (30 to 90 cm) tall. Another species common in America is the black-eyed Susan, or yellow daisy. .) A number of varieties of daisies have been developed by horticulturists as garden plants. One of these, the Shasta daisy, is noted for its large flower heads, which measure two to four inches (5 to 10 cm) across. It was developed by Luther Burbank.
The English daisy is Bellis perennis; the oxeye daisy, Chrysanthemum leucanthemum; the black-eyed Susan, Rudbeckia hirta. The Shasta daisy is a variety of Chrysanthemum maximum.The oxyeye daisy is a type of chrysanthemum with white rays.