Open-pollinated seeds are selected & saved for generations. They are rare varieties with historical, cultural or social significance. If saved correctly, they will reliably produce an adapted, but true seed annually.
When a plant contains both male & female parts, it can produce fruit without insects or other plants.
Pollen transferred from one plant’s flower to another. This is usually done with help from pollinators, and allows the plant to produce fruit, and eventually more seed.
Plants that produce seed naturally. They will reliably produce the same plant as the parent.