Summary
The distribution of the dark keeled form of Lotus corniculatus in Western Europe is described. Although there is an association between the frequency of the dark keeled form and latitude in England and Wales, no differences between the dark keeled and light keeled forms in the winter survival or in seed production were found under experimental conditions. Furthermore, there appears to be no association between cyanogenesis in the leaves and keel colour, either on a per plant or on a population basis.
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Jones, D., Crawford, T. Variation in the colour of the keel petals in Lotus corniculatus L.. Heredity 39, 313–325 (1977). https://doi.org/10.1038/hdy.1977.72
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DOI: https://doi.org/10.1038/hdy.1977.72
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