What are the examples of "coevolution" in flower pollination?

Examples of "co-evolution" in the process of flower pollination: well-known examples of co-evolution in the process of flower pollination include octagonal gall midge, banyan, yucca moth, abacus, Phyllanthus urinaria, Tricholoma tahuangkou and so on.

According to the presence or absence of pistils and stamens, flowers can be divided into bisexual flowers and unisexual flowers. A flower with pistils and stamens in it is called bisexual flower, and a flower with stamens or only pistils is called unisexual flower. Among unisexual flowers, flowers with only pistils are called female flowers and flowers with only stamens are called male flowers.

Introduction to fertilization

Fertilization is the process of combining sperm and egg cells. Pollen grains germinate to form pollen tubes after reaching the stigma, which is the beginning of fertilization process. There are also differences between flowering and fertilization and cleistogamy. However, whether pollen grains can germinate normally and lead to successful fertilization depends on the mutual recognition and affinity between pollen grains and stigma, in addition to suitable environmental conditions. Recognition is due to the interaction between pollen and the recognition protein on the stigma surface.