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).
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Anagallis grandiflora— pale 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
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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
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
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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