Self-pollination has the end effect of reduce heterozygousity by one half for each generation of selfing. The designation F 1 indicates the first fillial generation. The degree of heterogeneity or polymorphisms within any population is a direct result of the level of homozygousity of the individual plant that the population decends from. For example, if an F 3 plant is selected and its progeny grown for a number of generations as a bulk population, the population will eventually become nearly completely homozygous. Such a population would be said to be F 3 derived.
Flowers differ greatly between plant species.
The following pictures and terms are designed to help you determine the likely mode of reproduction of a given plant. A complete flower. The pistil is the female portion of the flower while the stamen is the male portion. The exploded parts of a complete flower. A perfect-incomplete grass flower.