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Dioecy (e.g., in Papaya) means male and female flowers are on separate plants. This prevents both autogamy (same flower) and geitonogamy (same plant). Self-incompatibility prevents fertilization but not the arrival of pollen. Monoecy prevents autogamy but not geitonogamy.
Ref: Diagram comparing Monoecious (Castor/Maize) and Dioecious (Papaya) plants.
Autogamy is self-pollination within the same flower. Geitonogamy is pollination between different flowers of the *same* plant. Genetically, both are forms of self-pollination because the pollen comes from the same genetic individual (genet), even if Geitonogamy is functionally cross-pollination requiring an agent.
Ref: Comparison diagram of Autogamy (same flower), Geitonogamy (same plant, different flower), and Xenogamy (different plant).
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