RECORD: Darwin, C. R. 1858.05.16. Plant from Cattells called Fumaria spicata or Dielytra eximia. CUL-DAR76.B13. 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 volumes CUL-DAR 76-79 contain material for Darwin's book Cross and self fertilisation (1876).


[13]

May 16th 1858. — Plant from Cattells, called Fumaria spicata, or (over) Dielytra eximia I saw Bees visit the nectaries on both sides formerly at Shrewsbury.

2 nectaries. Hood with petals firmly attached will move equally well to right or left. Pistil straight [sketch] a b I do not know whether a or b is stigma they are directed in same plane with nectaries I have no doubt a is.—

Dielytra spectabilis. 2. nect, Hood moves either way, pistil straight Lindley. Veg. Kingdom 1853 1854? p. 436 says there is special contrivance [sketch] for self fertilisation, I cannot see this in above, but do not doubt this: it makes Asa Grays objections all the better as reason for introducing this discussion.— I have seen large female Bombi of 2 species. visit this flower, seldom both nectaries on same flower; & it was beautiful to see manner, in which hood was pushed by legs pressed against the lateral keels of hood far back, either way & straight pistil & anthers rubbed against belly & inner sides of thighs, which were thickly dusted with pollen. — (saw Humble visit both nectaries of same flower)

Adlumia cirrhosa— apparently same structure as in above in all respects, except 2 stigmatic surfaces still more divergent—

Corydalis lutea. (I saw Bees formerly at this flower at Shrewsbury) here structure very different— large nectary to upper lip— 2 inner petals of hood cohere much less strongly — pistil bends towards nectary side. [sketch] I observed the Corydalis many different times & periods.—

when hood disturbed the two halves separate, & spring slightly back from nectary sides, whilst the pistil springs towards upper lip with nectary, ensuring being rubbed by Bee: — it here lies protected from rain in a fold of upper petal. (the whole very like in Leguminosæ) Hood like Keel serves to protect anthers &c from rain. —

& stigma pi top of style here like crescent, with 2 stigma in middle [sketch]

Pollen shed very easy in all these flowers.─

Fumaria officinalis? & parviflora? observed 20 years ago, I say pistil bends towards nectary lip.— Did I overlook springing up, I think so, for I overlooked it in C. lutea. — I further say hood will slip off easily only toward side without nectary. —

[13v]

Begin by saying I cd advance many other facts, but I had determined to give none other, had not A. Gray brought forw case of Adlum cirrh, & had not Lindley adduce the [illeg] as adapted to self-impregnation─ I do not venture to express an opinion on or doubt this latter view; but I cannot doubt that the structure of the cor corolla & pistil has been directly modified to favour crossing

The case is somewhat like in a very different order, to the Leguminosæ. — It is also like the allied Berlinidiæ, in which there is contrivance for self-fertilisation, inducing also crosses. —


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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 1 June, 2023