in Morphology of Flowering Plants by

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When a flower is capable of being divided into two similar halves only in one particular vertical plane, much like a yoke, it is said to be zygomorphic ('yoke shaped', 'bilateral symmetry'). Generally these flowers have petals of two more different shapes, sizes, and colors.

Examples: PEA, IRIS, GULMOHUR, BEAN, SNAPDRAGON, CASSIA etc.

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