This site, from retired Harvard professor John W. Kimball, provides a detailed but understandable explanation of sexual reproduction in flowering plants. Includes informative, well labelled illustrations.

Since evolution favors genetic variability what prevents pollen from fertilizing its own eggs? This effective site presents answers to this question.

This is the reproduction chapter from an online text, courtesy of the Forest Biology Department of Virginia Tech. Learn about trees, their flowers, and other details of their reproductive cycle.

Discusses asexual and sexual reproduction in flowering plants, the parts of a flower, how pollination takes place, fertilization, and seed development.