Irregular flower : - Irregular flowers, such as those of the violet or the pea, are often bilaterally symmetric. The pea has one large upper petal above, two free petals on the each side, and two petals fused together in a keel shape below. Compare regular flower.
regular flower : - A radially symmetric flower. In a regular flower, all of the members of a single whorl, such as the petals, are similar in shape and size. Lilies and the apple tree, for example, bear regular flowers. Compare irregular flower.
Regular flowers are those flowers that grow throughout the year.

irregular flowers are those flowers that only grow in a particular season.