According to Regularity of Organ:
- Regular Flower: Flowers in which the members of each whorl are similar in shape and size called regular flower. e.g. Datum, Brassica, Hibiscus (China-rose) etc.
- Irregular flower: A flower having member of each whorl (especially calyx and corolla) dissimilar in size and shape is called irregular flower. pisum (Motor), Clitoria (Aparajita), Beans (Shim), etc. are irregular flowers.
According to Symmetry:
- Symmetric Flower: A flower, which may be cut into two equal halves by one or more vertical plane passing through the center of the flower is called a smymetric flower. Symmetrical flowers are of two types: –
(i) Zygomorphic: Flowers, which may be cut into two equal halves by only one vertical plane passing through the center of the flower is called Zygomorphic flower e.g. pisum, Beans, Clitoria etc.
(ii) Actinomorphic: Flowers, which may be cut into two equal halves by more than one vertical plane passing through the center of the flower, is called actinomophic flower. e.g Datum, Hibiscus, Brassica etc.
- Asymmetric Flower: Flowers, which cannot be cut into two equal halves by any vertical planes is called asymmetric ‘flower. Canna (Kalabati) flower is an asymmetric flower.
