arranged in definite whorls. Example: Brassica. . Acyclic or spiral: The floral parts are arranged in spirals on the elongated fleshy torus.
Example: Magnolia . . Spirocyclic or hemicyclic : Some parts are in whorls and others parts are in spirals. Example: Annona, Polyalthia .
. Calyx Calyx protects the flower in bud stage. Outermost whorl of flower is calyx. Unit of calyx is sepal.
Normally green in colour. . Fusion : a . Aposepalous (polysepalous): The flower with distinct sepals.
Example: Brassica, Annona. b. Synsepalous: The flower with united or fused sepals. Example: Hibiscus .
. Duration of floral parts: What is the green part of brinjal fruit? Have you seen similar to this in any other fruits? a.
Caducous or fugacious calyx : Calyx that withers or falls off during the early development stage of flower. Example: Papaver . Figure . : (a) Caducous bud with sepal Figure .
: (b) Caducous flower without sepal b. Deciduous : Calyx that falls soon after the opening of flower (anthesis) Example: Nelumbo . . .
Flower symmetry What is the radius of a circle? Cut a paper into round shape, fold it so as to get two equal halves. In how many planes will you get equal halves? In how many planes you can divide a cucumber in two equal halves?
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. . 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 . Figure . : (a) Actinomorphic Figure . : (b) Zygomorphic Figure .
: (c) Asymmetric . Zygomorphic (bilateral symmetry ) or monosymmetric : The flower can be divided into equal halves in only one plane. Zygomorphic flower can efficiently transfer pollen grains to visiting pollinators. Example: Pisum , Bean.
. Asymmetric (amorphic ): Flower lacks any plane of symmetry and cannot be divided into equal halves in any plane. Parts of