Zygomorphic, unsymmetrical.
Plant parts that are asymmetrical.
Describes a flower that is not radially symmetrical, with parts of unequal size or shape.
In botany, a term applied to a flower in which the floral whorls are unequal.
Not regular or normal.
Having the petals arranged in some way other than radial symmetry, though almost always bilaterally symmetrical, such as on orchids and violets. The scientific term is ‘zygomorphic’. A few flowers lack even bilateral symmetry, for example, cannas.