RECORD: Darwin, C. R. 1878.06.18. Acanthus spinosus. CUL-DAR209.3.66. 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).
[66]
Jun 18 /1878
Acanthus spinosus
In a young plant with 2 first leaves almost equally developed, the angle formed between them struck the eye is less at night, than in middle of day.— The difference depending chiefly or exclusively on the straightening & rising of the blade at night, & not on movement of the petiole— The angle measured from apex apices of the 2 leaf to base of petioles ground & axis of plant being 54° [-] 33 [=] 21 at noon & only 33° at 10° 15 P.m.
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 8 December, 2022