(1) A typical flower consists of an outer whorl of green sepals (calyx) which protects the parts within.
(2) The second whorl has petals (corolla) which are usually brightly coloured. They sometimes have fragrance also.
(3) Petals are soft and are useful to attract insects to facilitate cross pollination.
(4) The third whorl of the flower consists of stamens (Androecium) which are the male reproductive organs.
(5) Each stamen is made up of a filament and an anther.
(6) Each anther usually has two anther lobes. The anther produces pollen grains (microspores).
(7) The inner most fourth whorl is gynoecium or pistil. It consists of ovary, style and stigma.
(8) Ovary occupies central portion on the thalamus. A swollen ovary is present on the
thalamus.
(9) Inside the ovary future seeds, known as ovules are present.
(10) Ovary has a pipe like extension called style. The tip of the style ends in stigma. The stigma receive the pollen grains.
