All 4 floral whorls present
Any one or more of floral whorl is absent
Both reproductive organs (stamens, carpels present)
(i)Staminate or male flower
(ii)Pistillate or female flower
(iii)On the basis of occurrence of unisexual flowers, plant is (a) Monoecious
Only one reproductive organ present
Only stamens present
Only carpel present
Both male and female flower occur on same plant, e.g. cucumber
Male and female flower occur on different plants, e.g. papaya
Both stamens and carpels are absent
Actinomorphic (regular) flower
Divisible into two equal halves by any radial plane e.g. mustard
Zygomorphic (irregular bilateral) flower
Divisible into two equal halves by a single vertical plane e.g. pea
It cannot be divided into two similar halves in any vertical plane e.g. Canna
Polysepalous and Polypetalous (poly-free): sepals and petals are respectively free.
Gamosepalous and Gamopetalous (gamo-united): sepals and petals are respectively fused.
Perianth: Sepals and petals not distinguishable e.g. onion.
Stamens show variation in their cohesion (fusion);
Monadelphous: stamens united by their filaments forming one group, (anthers free), e.g. China rose.
Diadelphous: stamens united by their filaments forming two groups, (anthers free), e.g. pea.
Polyadelphous: stamens united by their filaments forming two or more groups, e.g. lemon.
Syngenesious: stamens are united by their anthers and filaments are free, e.g. sunflower.
Synandrous: stamens united by both filaments and anthers, e.g. pumpkin.
Epipetalous: stamens united with the petals, e.g. Brinjal.
Epiphyllous: stamens united with the perianth leaves, e.g. onion.
Didynamous: four stamens, two short and two long, e.g. Tulsi.
Tetradynamous: Six stamens, inner four are long and outer two are short, e.g. mustard.
On the basis of number of carpels, flowers may be;
Monocarpellary: having one carpel, e.g. pea.
Polycarpellary: having many carpels, e.g. China rose. It may be;
Syncarpous: carpels are fused, e.g. tomato.
Apocarpous: carpels are free, e.g. lotus.