Abstract

Some of the factors governing seed-set in three populations ofLythrum salicaria are examined during two seasons. Plants spatially segregated from legitimate neighbours by distances exceeding 1m set few seeds. Plants with small inflorescences set fewer seeds than those with medium or large inflorescences. Flowers having self pollen applied to the stigma before legitimate pollination set fewer seed per flower than those pollinated with legitimate pollen only. Seeds of the mid-style morph germinated more effectively than those of the long style morph and seeds of the short-style morph showed very low levels of germination.

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