The Complete Work of Charles Darwin Online

RECORD: Darwin, C. R. 1878.06.25. The short petioles of the Cots. CUL-DAR211.29. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 1.2023. 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 editors of the Correspondence of Charles Darwin identified this as an enclosure to a letter to Francis Darwin (26 June 1878).

[29]

June 25th 1878. The short petioles of the Cots of Cassia are enlarged, transversely wrinkled & formed of tissue appearing different from that of lamina & Hypocotyl.—

How is Oxalis valdiviana & rosea or floribunda??

I neglected to observe with Cassia whether when Cots. Horizontal upper surface of petiole is transversely wrinkled.—

I have looked at Cots. of Oxalis floribunda & this seems to be a semicircular pale-coloured pulvinus on upper surfaces formed of smaller cells; but it tired me too much to look carefully.— Now on V. corniculata the cots of which raise only 45° I can see no pulvinus— This very important showing the pulvinus developed in same genus.

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