1. Self-pollination. It is also called autogamy. The pollen grains are transferred from the anther to the stigma of the same flower. e.g hibiscus.
2. Cross-pollination. It is also called allogamy. If the transfer of pollen takes place from anther to stigma of a different flower of same plant, it is known as Geitonogamy. e.g Maize.
On the other hand, if cthe transfer occurs from anther to stigma of a different flower of different plant, it is called the Xenogamy. e.g papaya.