RECORD: Darwin, C. R. 1868.05-11.01. Anagallis grandiflora — pale red var. CUL-DAR79.17-19. 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).


(41

Anagallis grandiflorapale red var

L. [Lettington] has crossed white thread with pollen of same var of another plant 24 flowers— & has fert. with pollen of own flower 36 fl.— Black thread

(I have crossed, after careful castration 11 red flowers with pollen of blue var : marked with white wool & conversely with 45 Blue var) with pollen of red. but none of these 5 flowers set capsules

(From the seed of var marked blue, 3 1 plants came up red. One of the reds had very much blue in it — is almost intermediate.) & another in lesser degree.)

From 24 crossed flowers 10 pods were produced. (ie 42 per cent very sterile) & they contained 6.30 seed on average with max. of 13.

From 31 self-fert. flowers 18 pods were produced (ie 5.8 per cent) & they contained 6.05 seed on average with max. of 14

The seed in the two foregoing lots equally bad.—

From 11 flowers crossed with pollen from blue var., 7 pods were produced (i.e. 63 per cent) & they contained on average 12.7 seed with double max. of 17. The seed was also conspicuously much finer than from crossed with same var. or those self-fertilised. In these 2 latter lots seed very poor & I doubt will not germinate; & seed difficult to count, so many doubtful bad ones to be thrown away as in Primula. — I do not know whether to account for power of blue var, by distinct vars crossing, or whether some sort of dimorphism, & all red of one form & blue of other. This wd account for other cases not being superior to self-fert

42

[calculations not transcribed)

(42

Anagallis grand. May 1865 (The plants crossed by Blue var, have germinated much more freely than those crossed by red & distinct plant.) (The seeds were sown on opposite sides of Pot.) & about same number of very young plants were allowed to grow.

 

Pot I. Red var. crossed by Blue var.}

Pot II Red var. crossed by same var. but distinct plant}

Crossed

20 1/2

 

16 1/4

36 3/4

Self

16

Self

14 1/2

30 1/2

 

Tallest Plant

 

do

X In both Pots the crossed flowered first —

Nov. 1. 68 These plants are now fully grown

[Tables not transcribed]

Mr Norman add up These 2 Post together

[Tables not transcribed]

(So that altogether in Pot I & II there were 13 crossed plants, & 11 self plants, (but the shorter plants in neither case yielded any pods); & the crossed produced 21 pods & self only 2, & crossed flowered first & grew taller.)

Nov. I Plants all cut down, & repotted in rather large pot; but not disturbed

[42v]

[calculations not transcribed]


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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 29 May, 2023