The flower

  1. The flower is the unit for sexual reproduction in angiosperms. A typical flower has four different kinds of whorls calyx, corolla, androecium and gynoecium arranged successively on the swollen end of the stalk or pedicel, called thalamus or receptacle.
  2. Calyx and corolla are accessory organs, while androecium and gynoecium are reproductive organs. In some flowers like lily, the calyx and corolla are not distinct and are termed as perianth.
  3.  When a flower has both androecium and gynoecium, it is termed bisexual. A flower having either only stamens or only carpels is termed unisexual.
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