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250 years of hybridization between two biennial herb species without speciation #MMPMID26187604
In 1759, Linnaeus convinced his followers that plants could hybridise by crossing flowers in the daisy family and producing intermediate offspring. These hybrids, between Tragopogon pratensis and T. porrifolius, exist naturally today in London, to all appearances the same. We find that most of the London hybrids are in their first generation, though we provide chromosomal evidence that one is a little older. These hybrids do not seem to have given rise to a new species, even though both parents have produced new hybrid species in the last century when crossed with T. dubius.