Abstract
The development and timing of different processes in the floral biology and sexual reproduction of Lilium longiflorum were studied and brought together into a chronological reproductive calendar. Care must be taken when emasculating flowers later than 4 days before anthesis (DBA), because the stomium of the anther was open from 8 DBA and the pollen grains appear to be mature from 3–2 DBA. The receptivity period of the pistil lasts for a rather long period, but before wilting of an unpollinated flower as determined by a change of the colour of the perianth from white into brown, the flower had already lost its receptivity. Because L. longiflorum pollen grains can easily be stored, the pistil receptivity should thus determine the pollination schedule. The relationships between pollen tubes and pistil are discussed with respect to plant breeding.
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