RECORD: Darwin, C. R. 1862.06.16-21. Oxalis acetosella. CUL-DAR111.A44. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 1.2023. RN1

NOTE: See record in the Darwin Online manuscript catalogue, enter its Identifier here. Reproduced with permission of the Syndics of Cambridge University Library and William Huxley Darwin. The volumes CUL-DAR108-111 contain material for Darwin's book Forms of flowers (1877).


[44]

Oxalis acetosella — Jun 16. 1862

Little imperfect flowers closed, with 5 spotted sepals & 5 convoluted petals; 5 longer stamens glued to 5 short pistil, by a mass of threads, ie pollen-tubes, proceeding up to stig The 5 short stamens well much smaller are smaller, & with less bilobed anthers sending both bundles of threads up to stigmas far below.

It is like spermatozoa finding their way to ovule in womb.— We then see all 10 stamens fertilise: tubes come out of anther.

June 16' Ox Bowii fertilised heteromorphically with pollen of O. Elegans rosea, two fl. black thread,—

O. Elegans rosea self-fertilised black thread.

2 more

3 fl. by pollen of O Bowii White thread.

[44v]

(a) Jun 21. 62 Frank brough me a small open flower, with stigma fleshy & 1/2 monstrous, not reaching up nearly to level of upper stamen, which were brown & withered — Lower stamens were dehiscing & pollen grains in loose packets of 4 — emitting tubes which end in finest possible points — & a few had got in stigma — so in intermediate conditions.

These facts &c show that monstrosities or dimorphism on same individual are, or can be produced gradations.


Return to homepage

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

File last updated 6 May, 2023