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Flower - a Fascinating Organ of Angiosperms - Flower Symmetry

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Topics

description

  • Flower symmetry
  1. Actinomorphic (or) radial or polysymmetric
  2. Zygomorphic (bilateral symmetry) or monosymmetric
  3. Asymmetric (amorphic)

notes

Flower symmetry:

  • A flower is symmetrical when it is divided into equal halves in any plane running through the center.
  • Flower symmetry is an important structural adaptation related to pollination systems.

1) Actinomorphic (or) radial or polysymmetric:

The flower shows two mirror images when cut in any plane or radius through the centre. Normally there are more than two planes of symmetry. ­Example: Hibiscus, Datura.

Actinomorphic

2) Zygomorphic (bilateral symmetry) or monosymmetric: 

The flower can be divided into 2 equal halves in only one plane. Zygomorphic flowers can efficiently transfer pollen grains to visiting pollinators. Example: Pisum, Bean.

Zygomorphic

3) Asymmetric (amorphic):

Flower lacks any plane of symmetry and cannot be divided into equal halves in any plane. Parts of such flowers are twisted. Example: Canna indica.

Asymmetric

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