Daisy is any of several species of flowering plants belonging to the aster family (Asteraceae). The name daisy commonly denotes the oxeye daisy (Leucanthemum vulgare), the Shasta daisy (L. ×superbum), and the English, or true daisy (Bellis perennis). These and other plants called daisies are distinguished by a composite flower head composed of 15 to 30 white ray flowers surrounding a center consisting of bright yellow disk flowers.

Source: Britannica