Letter 11191
Müller, J. F. T. to Darwin, C. R.
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Doubts that glands of calyx of cleistogamic Malpighiaceae serve as protection.
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Some species of Solanum bear long- and short-styled flowers on same plant.
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Changing colours of some flowers may show insects the proper moment for fertilisation.
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Doubts that the style of Pontederia cordata changes length.
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Sexual difference in wings of some butterflies due to development in male of scales that emit odours to excite female.