Summary
The white flowered morph of Cirsium palustre (L.) Scop. is subject to preferential pollination. Since the polymorphism is localised in regions which are likely to possess a low pollinator activity it is suggested that the polymorphism may be an adaptive response to conditions of low pollination.
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Mogford, D. Flower colour polymorphism in Cirsium palustre. Heredity 33, 257–263 (1974). https://doi.org/10.1038/hdy.1974.91
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DOI: https://doi.org/10.1038/hdy.1974.91
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