RECORD: Darwin, C. R. & Francis Darwin. 1878.07.30-08.02. Anoda Wrightii. CUL-DAR209.14.6-7. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

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).


(1

Anoda Wrightii (Malvaceæ)

Growing out of doors in the Botanic Garden at Würzburg

Where the lamina joins onto the petiole there is a swelling but it is not distinct enough to be called a joint

Three leaves were observed at rather irregular times between not earlier than 11 am & or later than 8 pm from July 30 to Aug 2. 1878

The movement of the petiole seems to be very irregular but there is usually a rise of 10°-15° at night. The extreme angles taking night & day together are in all 3 leaves observed, are 50° above the horizon, & 75° above

The position of the leaves may be said to vary in the day between horizontal & 25° below horizontal, & at night

2

Anoda Wrightii

between 55° below & 35° below: The greatest fall at night observed was 45° 30°, from 5 25° below to 45° 55° below; the smallest was from 20° below to 35° below


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

File last updated 16 August, 2023