RECORD: Darwin, C. R. 1878.12.29-30. Pea / Draft of Forms of flowers. CUL-DAR209.7.116-117. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 8.2022. 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-DAR209.7-8 contain notes on heliotropism (phototropism) for Darwin's book Movement in plants (1880).


[116]

Pea (Used)

Top of petiole tied

Dec. 29th

8° 20'

[data not transcribed]

30th 6° 50

Kept in Study [sketch] Light in Hall

Nice young trifid tendril — tip of longest branch in line with dot on top of stick. Horizontal glass— Kept dark above— N.E window with muslin blind— open to room behind — Clear morning — Plant placed in reversed position compared to position in greenhouse with respect to light

[116v]

(p. 50A

Ch I

forms. But the evidence is seems sufficient to leave hardly a doubt that Androsace is heterostyled. Fritz Müller sent me from S. Brazil dried flowers of a Statice which he believed to be heterostyled, The pistils In the one form are the pistil is considerably longer, & the stamens slightly shorter than the corresponding organs in the other form. But as in the shorter-styled form the stigmas reach up to the anthers of the same flower, & I could not detect in the dried specimens of the two forms no any difference in their papillæ on the stigmas, or in the size of the pollen-grains, I dare not rank them this plant as heterostyled. In a large number of plants the pistils From statements made by Vaucher I had thought was led to think the Soldanella alpina was dimorphous heterostyled but it is impossible that Kerner who has closely studied this plant, could have overlooked the fact. So again from some from other statements it appeared possible that Pyrola might be dimorphic heterostyled, but H. Müller examined for me two species in N. Germany, & found this not to be the case.) No other genera amongst the Primulæ

[Forms of flowers, pp. 53-4: "He was able to examine only dried specimens of the long-styled forms. But the evidence seems sufficient to leave hardly a doubt that Androsace is heterostyled. Fritz Müller sent me from South Brazil dried flowers of a Statice which he believed to be heterostyled. In the one form the pistil was considerably longer and the stamens slightly shorter than the corresponding organs in the other form. But as in the shorter-styled form the stigmas reached up to the anthers of the same flower, and as I could not detect in the dried specimens of the two forms any difference in their stigmas, or in the size of their pollen-grains, I dare not rank this plant as heterostyled. From statements made by Vaucher I was led to think that Soldanella alpina was heterostyled, but it is impossible that Kerner, who has closely studied this plant, could have overlooked the fact. So again from other statements it appeared probable that Pyrola might be heterostyled, but H. Müller examined for me two species in North Germany, and found this not to be the case.
* See also Treviranus in 'Bot. Zeitung,' 1863, p. 6, on this plant being dimorphic."]

[117]

Dec 30'

Pea (Reversed Pot)

[data not transcribed]

[117v]

(48

Ch I Hottonia

made a few trials on a short-styled plant, and found that the legitimate unions were in all ways more fertile than the illegitimate; but since the publication of his paper, H Müller has made much fuller experiments; and I give his results in the following table, drawn up in accordance with my usual plan.

[Forms of flowers, pp. 51-2: "Mr. Scott‡ made a few trials on a short-styled plant, and found that the legitimate unions were in all ways more fertile than the illegitimate; but since the publication of his paper H. Müller has made much fuller experiments, and I give his results in the following table, drawn up in accordance with my usual plan:—
‡ 'Journ. Linn. Soc. Bot.' vol. viii. 1864, p. 79."]


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

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