2. Incomplete flowers: pumpkin flowers and cucumber flowers lack stamens or pistils. Mulberry flowers and chestnut flowers lack petals, stamens or pistils; Yang Shuhua and willow flowers lack sepals, petals, stamens or pistils.
3. According to the status of pistil and stamen, flowers can be divided into two types: in a flower, stamen and pistil exist at the same time, which is called bisexual flower, such as peach and wheat flower. A flower with only stamens or pistils is called a unisexual flower, such as the flower of pumpkin and towel gourd. Flowers with only stamens are called male flowers; Only pistils are called female flowers.
1. According to the structure of flowers, flowers can be divided into two types: complete flowers and incomplete flowers. In a flower, the calyx, corolla, stamen and pistil are all available, which is called a complete flower.
2. In a flower, there are four parts: sepals, petals, stamens and pistils. If one or three parts are missing, it is called an incomplete flower. Both male and female stamens in a flower are absent or lacking, and the marginal flower in sunflower inflorescence is also called sterile flower. Refers to the seed plants sometimes pistils and stamens completely degenerate and disappear, or flowers that cannot bear seeds because of incomplete development. This kind of flower belongs to incomplete flower.