Chasmogamy

These distinct seeds increase genetic diversity of the plant population and reduce inbreeding depression and deleterious alleles.

[2] Seeds produced by chasmogamous flowers that are cross-pollinated may also exhibit hybrid vigor (heterosis) and increased fitness.

To promote cross-pollination, chasmogamous flowers often have strikingly colored petals and nectar guides or nectaries to attract and reward pollinators.

[1][5] In addition to chasmogamy and cleistogamy, many plant species possess a mixed breeding system that utilizes both chasmogamous and cleistogamous flowers.

This leads to increases in genetic diversity and assures reproductive success in variable environmental and pollinator conditions.

Chasmogamous (a) and cleistogamous (b) flowers of Viola pubescens . Arrows point to structure.