Nothing quells the excitement of discovering a new flower quite like not being able to find out what kind of flower it is. When the flower sprouts in your garden bed, you can be reasonably sure it came from seeds from flowers you've planted in previous years. Sometimes, a rogue flower appears along the roadside or in the front yard that doesn't look anything like flowers from your garden. Identifying them may require browsing images until you find one that matches your specimen.
Examine the size of the bloom. Measure both the width of the bloom and the height of the plant. Take note of foliage as this may provide clues useful in identifying the flowers.
Look at the flower to determine what kind of petals it has. Some flowers, such as daisies, coneflowers, zinnias and cosmos have a single row of petals around a distinct centre. Others, such as marigolds, begonias, and roses lack a centre and have many petals in one cluster. Still others may have trumpet- or bell-shaped blooms that lack distinct petals.
Note any variations in colour. If more than one flower is available compare the colour of the blooms. Some flowers such as nasturtiums, coneflowers and zinnias come in a variety of colours. Resist the urge to assume that the flower you have found will always be the same colour. Images may depict the flower in another shade.
Compare the size, shape, type of petals and colour to images in seed catalogues or a plant encyclopedia. Read the accompany information about the flower for additional clues once you find similar flowers. Your notes on plant height and foliage type may prove helpful when reading the description of the plant.