RECORD: Darwin, C. R. 1879.08.30. Siebeckia orientalis. CUL-DAR209.14.129. Edited by John van Wyhe (Darwin Online,

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 7.2023. 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 volume CUL-DAR209.14 contains material for Darwin's book Movement in plants (1880).


Aug 30th. 1879

Siegesbeckia orientalis— plants now 10-11 inches high— younger leaves on summit — between 2 & 2 3/4 in length at night greatly curved downwards— may be truly said to be asleep.— On previous & subsequent morning strictly horizontal


At the end of August when the plant had grown to a height of be 10-11 inches the younger leaves of the same length as before, now depended so much at night, that they might truly be said to sleep

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Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (

File last updated 18 August, 2023