A flower in which one or more members of a whorl, or of several floral whorls, differ in form from other members. 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.
An irregular flower is generally distinguished by petals of unequal size or shape.
Study of an irregular flower to show adaptations for insect visitors.
Peloria, an abnormal return to regularity and symmetry in an irregular flower; commonest in Snapdragon.