Although there is only one daisy, the flower family Asteraceae is usually called the daisy family. What most people consider daisies are members of the Asteraceae family and are not real daisies, but these flowers have so many similar characteristics, it makes sense to think of them as daisies. Some members of the Asteraceae family are considered daisy flowers, yet look nothing like a daisy.
The English daisy, bellis perennis, is the only true daisy. The flower has white or off-white petals that burst outwards from a yellow centre. The name comes from a combination of the words "day's eye," which refers to the fact that the flower closes every night and opens every daybreak.
One type of chrysanthemum, the daisy mum, is often mistaken as a daisy, because it has rays of petals surrounding a yellow centre. However, unlike the true daisy, these petals aren't always white, and have a wide variety of colours, from pinks to yellows to blues.
Dahlias are members of the Asteraceae family and are considered daisies, although they don't look like the traditional daisy. The blossoms have a star configuration, as the daisy does, but the petals are ruffled and flare upwards, and there is no classic daisy-like centre.
Asters look as much like daisies as daisy mums do. All asters have yellow centres like true daisies and have brightly coloured petals surrounding the centre.
Globe thistles are another member of the Asteraceae family that are considered daisies, but look nothing like a daisy. The flower looks more like a ball or a puff of thin petals, instead of the typical star-shape with ray petals.
Dandelions are famous in North America for being weeds that plague lawns and landscaping. They are small, bright-yellow flowers with bursts of thin, yellow petals.
This flower definitely received its name from its daisy-like appearance. Instead of flat petals, this flower's petals flare upwards, almost like a goblet.