“…Flowering time differences between plants have been found in populations or many species (e.g., Ashton, 1975;Bawa, 1983;Cooper, 1959;Florence, 1964;Frankie et aL, 1974;McNeilly and Antonovics, 1968;Medway, 1972;Stern and Roche, 1974;Westerman, 1971). In such populations the potential exists for allele frequencies in the outcross pollen pooi to change during the flowering season as the flowers open at different times may show different genotype frequencies.…”