RECORD: Darwin, C. R. 1862.10.04. Dichogam / Campanula carpathica. CUL-DAR79.113. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 3.2023. 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-DAR 76-79 contain material for Darwin's book Cross and self fertilisation (1876).


[113]

Oct 4. 1862 Dichogam

Campanula carpathica seeds profusely exposed (does it produce nectar, I have noticed only pollen-gatherers at work) & did not produce one pod under net.—

(On other hand. Venus Looking Glass Campanula speculum. (Specularia?) sets as many pods under net as exposed— I have only seen Diptera visiting this. The stigma before it open is covered with pollen: & as it open, I think some gets between clefts & at apex.— but corolla is dusted & I believe closes & opens & this may be effective.—

Steudel calls it Specularia speculum.

I see this plant on wet cold days & nights closes its flower; each petal moves its →

[113v]

midrib almost to axis of flower, folding backwards the wings of each petal; & I suspect this pressure of midrib would force pollen on to divisions of stigma; after the stigma has expanded: certainly in some cases I found the midrib of petal lying in the forks of 1 or 2 of clefts of expanded & reflexed 3 stigmatic divisions. —) (It is certain that petals get covered with pollen at point corresponding with reflexed stigmas — it is certain that flower shoot up neatly, & repeatedly I found infolded midrib of 2 petals forced in between divisions of stigma, which certainly would tend to force pollen on to surface of stigma.—

Hence we can understand copious self-fertilisation — Does Campanula shut flowers — See Fermonds pamphlet & reflections.


Return to homepage

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

File last updated 31 May, 2023