1. Maturation of anther (stamen) and stigma (carpel) at different times is called dichogamy.
2. Dichogamy is of two types, viz, protandry and protogyny.
3. Maturity of anthers before that of gynoecium is protandry and maturity of carpel before maturity of pollen grains is protogyny.
4. As this forms barrier for self-pollination, dichogamy favours cross pollination.
