Pollination Intensity and Seed Set in the Evening Primrose (Oenothera fruticosa)

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Abstract
In the evening primrose (O. fruticosa) measurements of the number of pollen grains deposited by each honeybee [Apis mellifera] visit, the number of visits a flower receives and the number of pollen grains necessary to achieve a certain level of seed set allow the prediction that pollinator service is adequate to accomplish complete seed set. The lower than predicted seed set observed in the field may be explained by the transfer of high levels of incompatible pollen.