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Term Definition
Zygomorphic A plant structure capable of being divided only into two equal parts. This term is most often used to refer to flowers.
Zygomorphic flower A flower capable of being divided into only two equal parts (mirror images) by a line passing through the middle of a flower, i.e., other lines passing the middle of the flower will not give mirror images of one another; same as monosymmetric, bilaterally symmetrical, and irregular flowers and opposite of actinomorphic, monosymmetric, radially symmetrical, and regular flowers. This term can refer to other plant parts as well. Zygomorphic flower of a legume. Photo by S. A. Mori.