Cleistogamy

Cleistogamy (from Greek kleistos = closed ) is a form of targeted plant self-pollination in closed flowers with the result of self-fertilization.

Some plant species, such as the violet or the stems Comprehensive dead nettle, possess except for the normal, established on cross-pollination flowers or flowers that stay small and inconspicuous, not open and pollinate themselves. These flowers are called cleistogamous. A typical example of cleistogamy are the species of the genus Frailea from the cactus family.

The opposite, ie pollination in open flowers are called Chasmogamie. This is the " normal case" and includes both foreign -and self- pollination.