RECORD: Darwin, C. R. 1880.04.02. Ipomœa leptophylla. CUL-DAR209.6.94. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 12.2022. 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-DAR209.6 contains materials for Darwin's book Movement in plants (1880).


[94]

Ap 2. 1880

Ipomœa leptophylla

petioles (outside measure to hypocotyl .37 inch in length hyp & radicle very short) had grown perpendicularly down at 8° 20' a.m placed horizontally

The petioles become only a little inclined down

8° 25' (Big Pin) 2d spec. with radicle & base of petiole just protruded from seed-coats placed so as to point to zenith — 12° slewed laterally, 2° 15' curled curled round into a semicircle. 4° P.m the Petioles are curled curled into semicircles semicircles laterally —Ap 3d 8° a.m a good length of both petioles now pointing point vertically downwards.

(over)

[94v]

N.B. The bending close to Cots: "The emergence bent curvature" occurs very soon soon, ie when the v hypocoty Petioles breaks through ground— They afterwards grow to great height above ground & are apogeotropic.

It is clear that the lower end alone alone of petiole is geotropic & this tendency tendency is soon soon lost in a day or before two days ha have elapsed — The upper part is apogeotropic, exactly the part which undergoes the temporary emergence curvature, which afterwards disappears.

In a New York seed Catalogue it is said that the root like an enormous Rutabaga & wd nearly fill a flour-barrel— Root perennial


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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 19 January, 2023