RECORD: Darwin, C. R. & Francis Darwin. 1878.10.26-11.18. Oxalis valdiviana / Draft of Forms of flowers. CUL-DAR209.6.155. (John van Wyhe ed., 2002-. The Complete Work of Charles Darwin Online, http://darwin-online.org.uk/)
REVISION HISTORY: Transcribed by Christine Chua and John van Wyhe, edited by John van Wyhe 12.2022. RN2
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 volume CUL-DAR209.6 contains materials for Darwin's book Movement in plants (1880).
The text of the draft corresponds to Forms of flowers, p. 114.
[155]
Oxalis Valdiviana
To see whether Cotyledons grow
(Oldish seedlings with a true leaf formed)
(used)
Oct. 26 2° 35' 1 Pin
from outside of 2 black marks at base of leaf Cot 37 1/2 / 500 of inch
29th 10° 35' am— 37 1/4 / 500 (no growth)
29' 9° P.m Cotyledons well asleep
2 Pins same date - barely 40/500
31st 2.° 20'. 37/300 — after 5 days no growth at base of Co
10° 40' P.m Asleep
[sketch]
Used
Nov 1 . asleep
2' do
3 Cots greatly raised
31st 2° 20' Same Leaf
Now measured distance between terminal point, as here indicated 40/500
Thus [sketch]
Nov 3d I make it only 35/500 (—I think I must have mistaken gradation)
certainly has not grown
Nov 4th 10° P.m. 1 Cot raised & not the other
Nov 5 2° 30' P.m ——— 35/500 after 5 days no growth at tip of Cot
Nov 5' 10° 15' Both Cots well raised
—— 6th 10° 15 . do . do
7 . — much raised, but not vertical ,a 2d leaf emerged
8th 10° P.m much risen. — 9th do — 10° do (11th do. 2 true leaves formed.)
Nov 12' do) 13th little raised) 14th about rectangular) 15th 10°underline a.m Cots considerably beneath a Horizontal plane 10° 15 at right angles. 16th' Cots. Hardly raised
18th not at all raised
[155v]
[top of page excised]
are mature) that the flowers must be cross-fertilised by many insects which visit them. Other species bear bear much less conspicuous flowers which secrete little or no honey, nectar, & are consequently are rarely visited by insects; these are adapted by for self-fertilisation, though still capable of cross-fertilisation. According to Delpino, the Polygonaceæ are generally fertilised by the wind, instead of by insects as in the present genus.)
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 18 December, 2025