RECORD: Darwin, C. R. 1861.06.01. London Pride (Saxifraga umbrosa). CUL-DAR76.A11. 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: 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-DAR 76-79 contain material for Darwin's book Cross and self fertilisation (1876).


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June 2d. 1861. London Pride (Saxifraga umbrosa)

C. C. Sprengel did not know it was a dichogam, but some other species he says are. (Good to will work in with my observations at Hartfield.)— London Pride is visited by many small flies, which suck minute drops of nectar from germen.— Anthers burst & emit bright red pollen by 2 or 3, one after other; but during this, whole time stigma is quite closed; then it expands & 2 finely fine bristled stigmas are exposed & not till this does it become papillose

(Clearly a dichogam. Not Hardly by wind for pollen seems is in some degree coherent & requires much force to blow off.) As 1 or 2 last anthers are shrivelled, the stigma begins to expand. Whilst anthers are w opening & are copiously shedding studded with pollen, the 2 stigmas are closely applied to eachother& are & hermetically sealed. Whilst anthers are opening they stand over the closed stigma, but this must be useless, when they have shed pollen, they filaments diverge & expand. Plenty of pollen on papillose stigmas of old flowers, which have not an

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anther left. — I took 4 stigmas by chance of old flower & found plenty of pollen on middle papillose part, which was closed & papillæ not developed when pale anthers on same flower were shedding their pollen.—

(Saw Humble-bee sucking this plant!!)


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

File last updated 1 June, 2023