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Plants of red clover (Trifolium pratense L.) vary greatly in the amount of seed that they produce. In diploid plants of the Dollard variety the best seed-yielding progeny plants seem to come most frequently from outcrosses between two high seed-yielding parents. Further studies have shown neither abnormal meiotic behaviour of chromosomes nor pollen abortion is strongly correlated with seed-yield in these plants. However, we now have evidence of three other causes of reduces seed yields; failure to produce embryo sacs, slow or limited pollen-tube growth, and the collapse of developing ovules. In tetraploid plants of this variety, meiotic irregularities account …
