| Because self-incompatibility operates after pollination, it reduces geitonogamous self-fertilization but not geitonogamous pollination. |
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| Furthermore, behavioral data reveal that pollen collection commonly is followed by geitonogamous pollination. |
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| Unless pollen is transported to another plant, geitonogamous self-pollinations therefore become more likely when plants are visited. |
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| Consequently, it reduces male fitness because geitonogamous pollen grains are barred from fertilizing ovules. |
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| In the Faroes Islands, Hagerup indicated that species with large inflorescences tended to be geitonogamous. |
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