RECORD: Darwin, C. R. [1878].09.09-10.11. [Trifolium repens]. CUL-DAR209.3.41. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 11.2022. RN1

NOTE: Reproduced with permission of the Syndics of Cambridge University Library and William Huxley Darwin. The volume CUL-DAR209.3 contains materials for Darwin's book Movement in plants (1880).


[41]

Sept 9th— cut off all withered & bowed down flower & turned flower-heads upside down & fastened to upright sticks marked with straw & covered with pots as on other side— flower horizontal now.— If these turn up it will be hyponasty

10'. 10° 30' a.m. I think some are turning down whilst still white, if so Heliotropism from light entering below

Sept 14th 11° 30' I strongly suspect that flowers move down through geotropism.

16' I think withering flowers are now turning up— if so hy epinasty

Sept 17th 12° 30' uncovered pots of the 2 without thr threads to sticks / some of flowers on further ones are horizontal & quite white to see whether apheliotropism can cause them to descend — no

(over)

[41v]

Sep 27. examined the 2 Heads which have been covered by Pots, all the time, with some light coming in from below.— There was so damp that half-rotted & gnawed by Oniscus; but in one the few remaining flowers were as much arched upwards as normally they are arched downwards.

In other head a few flowers on one side were similarly arched upwards but the remaining flowers were prevented by stick & thread from curving upwards,— must be epinasty & we know it is modified circumnutation

(N.B one of Heads which had been covered by Bell-glass & cd not have been visited by bees has sets some seeds.)

(Oct 11th a flower-head covered with pot till withered & then left exposed to light was so fixed that head almost horizontal, a little inclined downwards, & the flowers now withered have certainly all bowed so as to be parallel to upper part of pedun main peduncle.— Certainly epinasty & not geotropism.─


Return to homepage

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

File last updated 8 December, 2022