Number of female and male plants of Lagerstroemia indica

The number of sepals is 4, the color is green, and the smell is foul.

The number of petals is 4, the color is yellow, and the smell is bad.

Stamen No.6 has a yellow smell.

The number of pistils is 1. The color is green and the smell is smelly.

Cucumber and other cucurbitaceae corn, Salicaceae

Female flower of a plant

It is a unisexual flower.

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.

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 flower, 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. Flowers with only stamens are called male flowers; Only pistils are called female flowers. Female flowers and male peanuts on the same plant are called monoecious plants, such as corn. Female flowers and male flowers are not born on the same plant, which is called dioecious, such as mulberry.

Cucumber is an important cash crop, monoecious. Generally, male flowers bloom at the lower node of the plant, and the ratio of female flowers to male flowers increases gradually with the increase of node position. A lot of work in the past has proved that the ratio of female flowers to male flowers can be adjusted by applying exogenous hormones and some chemicals, but people know little about the mechanism of hormone regulating the ratio of female flowers to male flowers. Studies have shown that there are bisexual stages in the early development of parthenocarpy in cucumber, but only one sex flower primordium will be formed in the end.

The fate of primordia without functional organs is generally considered as "degeneration", and there is little in-depth study.