Summary
Over the past 20 years there has been a rapid spread in the British Isles of the radiate variant of Senecio vulgaris L. The evidence that this variant has arisen (a) from introgression into S. vulgaris by S. squalidus, or (b) as a mutant of S. vulgaris, is summarised. It is concluded that the latter alternative seems at least equally plausible judging from the available data, and that there appears to be no reason to believe that the spread of radiate groundsel is a measure of continuing hybridisation.
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Stace, C. The origin of radiate Senecio vulgaris L.. Heredity 39, 383–388 (1977). https://doi.org/10.1038/hdy.1977.80
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DOI: https://doi.org/10.1038/hdy.1977.80
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