RECORD: Darwin, C. R. & Francis Darwin. 1879.09.02. Anoda Wrightii. CUL-DAR209.14.8. 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).


Anoda Wrightii Sep 2 1879

Examined big leaves of 2 1/2 & 2 1/4 inches long, and small leaves of 1.45 inches and 1.65 inches long. These were from spirit specimen. The leaves marked by cutting off tip seem to have been about 2 in long judging by one measured [sketch] by filling in the tip by imagination.

The pulvinus in the big leaves reminds me of Sida the cells being having their long axis transverse to the axis of the petiole & yet not have the regular pulvinus look of an Oxalis for example.

In the small leaves the pulvinus is certainly present but

It is less well defined than in the big leaves

But the difference is not enough to account for the young leaves not sleeping at all

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

File last updated 16 August, 2023