Complete flowers and incomplete flowers: According to the structure of flowers, flowers can be divided into complete flowers and incomplete flowers. In a flower, calyx, corolla, stamen and pistil are all four parts, which are called complete flowers, such as cabbage flowers and peach blossoms; Incomplete flowers that lack one or three parts, such as pumpkin flowers and cucumber flowers, lack stamens or pistils; Mulberry flowers and chestnut flowers lack petals, stamens or pistils; Yang Shuhua and willow flowers have no sepals, petals, stamens or pistils.

Male and female flowers: flowers with only stamens are called male flowers; Only pistils are called female flowers. Female flowers and male peanuts are on the same plant, which is called monoecious.

Unisexual and bisexual flowers: According to the status of pistil and stamen, flowers can be divided into two types: in a flower, stamen and pistil coexist, which is called bisexual flowers, such as peach blossom and wheat flower. Flowers with only stamens or pistils are called unisexual flowers, such as those of pumpkin and towel gourd.