heterostyly
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Heterostyly, in which lengths of the stamens and stigma differ in flowers of different plants of the same species. This is a device to avoid self-pollination and ensure cross-pollination by visiting insects.
In botany, having styles of different lengths. Certain flowers, such as primroses (Primula vulgaris), have different-sized anthers and styles to ensure cross-fertilization (through pollination) by visiting insects.
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