RECORD: Darwin, C. R. [1864]. Draft of Three forms of Lythrum salicaria. CUL-DAR27.2.B18. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 12.2022. RN1

NOTE: Reproduced with permission of the Syndics of Cambridge University Library and William Huxley Darwin.

Darwin, C. R. 1864. On the sexual relations of the three forms of Lythrum salicaria. [Read 16 June.] Journal of the Linnean Society of London (Botany) 8: 169-196. The text of the draft corresponds to p. 181.


[18]

I fertilised a considerable number of flowers on two [text excised] pollen taken by a camel hair brush from both sets of long & short anthers of this long-styled [text excised] more long styled [text excised] I did not examine with a lens, (as I did with in the veget case in the above table) whether pollen sufficient pollen had been placed on the stigma: & only 8 capsules were produced & these contained yield on an average 14.5 seed. In 1863 I tried a much better experiment; I planted the a long-styled plant was grown by itself miles away from any other plant, so that the stigmas could have received not its only the two kinds of pollen proper to this form. The flowers were incessantly visited by bees, so that the stigmas would must have received on various hours of the day & on favourable days abundant pollen the most favourable periods days & at the most favourable hours successive applications of pollen; & all who have crossed plants know that this highly favours fertilisation.

Hence This plant produced an abundant crop of capsules, though fertilised by its only by pollen its own two kinds of pollen. I took by chance 20 capsules of them (Excluding one pair one capsule ) & these contained seed as below here given below.

0 0 0 0 0

This gives an average of 21.5 seed per capsule; & as we know that this form, produce produce, when fertilised by bees standing near plants of the other two forms, & fertilised by insect, produces an average of 93.1 seeds per capsule, we see that its the long-styled fertilised by its own pollen has its is between yields only between one-fourth & one-fifth less than what is normal. of the full number.—

[In another hand:] footnote (p. 181 of printed paper)


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Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)

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