Abstract
SINCE Darwin directed attention to the problem of the evolution of a species, there has been considerable interest in the extent to which the individuals of such a species form fertile offspring when crossed with other organisms not included in the species. Obviously, if such attempts at hybridisation were in effective under natural conditions or yielded infertile offspring, then the maintenance of the species as a distinct race was readily intelligible, however difficult it might be to understand how varieties crossing readily with one another had in course of time devolved into distinct species which had lost the power of interbreeding.
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Natural Hybrids in Plants. Nature 123, 587–588 (1929). https://doi.org/10.1038/123587a0
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DOI: https://doi.org/10.1038/123587a0