Abstract
Lythrum salicaria L. is a classic example of tristyly. Pollen flow within a natural population of this species was studied by analyzing pollen loads on stigmas of both intact and emasculated plants. The data obtained indicated that a significant amount of self pollination occurs within flowers but that between flowers or plants pollinations are predominantly legitimate, i.e. between stamens and styles of equal length. It is concluded that while the multiallelic system excels in reducing frequency of incompatible pollinations between plants, the heteromorphic system is relatively more effective in reducing self pollinations within a plant.
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