RECORD: Darwin, C. R. 1857.08.06-1857.08.14. Ch 3 / Lobelia fulgens. CUL-DAR49.88v. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 1.2022. RN1

NOTE: See record in the Darwin Online manuscript catalogue, enter its Identifier here. Chapter 3 refers to chapter III of Natural selection "on possibility of all organisms crossing: on susceptibility of reproduction to change".

Reproduced with permission of the Syndics of Cambridge University Library and William Huxley Darwin. The volume CUL-DAR49 contains notes for Natural selection chap. 3 on 'On...organic beings occasionally crossing' or dichogamy.


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Ch 3

Aug 6 /57/ In crimson Lobelia Lobelia fulgens var. multiflora & little Blue— in flower not yet opened, I found pollen shed in astounding mass & stigma with beautiful brush just below anthers & certain to brush it out during its growth. After flower has expanded sometime & all pollen long gone, then stigma widely expands, so as to hide brush.

Must be dichogamous.

What use of brush on distal margin of anthers - ? must be of some use.

Aug 14th I now find that the pollen, after flower sometimes expanded, by slow growth of pistil has

 

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pollen slowly pushed out, & when in this state if brush-like fringe of anthers be rubbed hard on finger thickly coated with pollen, bends down so that large insect wd. be rubbed & subsequently stigma might be rubbed. I impregnated 2 flowers & corolla withered few days after before other flower below & above. - After flower fully expanded, stigma did not protrude for 40 hours: its bilabiate stigma opened soon after, & then hides circular brush of white hairs - not a grain on stigma - pistil continues to grow.

(Sunday 9 1/2 A.M. Flower opened.

3 P.M. some pollen cd. be brushed out.

Wednesday 11 1/2 A.M stigma quite closed, protruding 1/20 of inch; circular beautiful brush loaded with pollen.

4 P.M. not open, considerably protruded.

5 1/2 not open.

Thursday 8 1/2 A.M. stigma fully open.)

The 2 pods on which I put pollen swelled to thrice as big as others & included innumerable seeds, all the seed pods contained only a few shrivelled seeds.


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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 25 September, 2022