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Letter 3502

Oliver, Daniel to Darwin, C. R.

10 Apr 1862

    Summary Add

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    Now believes flowers of Fumariaceae must be self-fertilised.

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    Planning a piece on dimorphism in the Natural History Review ["On the two forms, or dimorphic condition, in the species of Primula … by Charles Darwin", n.s. 2 (1862): 235–43].

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    Observations on Campanula dimorphism.

Transcription

Richmond, SW.

10. IV. 1862

My dear Sir.

It is very atrocious of me to trouble you especly. that I gather from Dr. Hooker that he thinks you may be unwell. But you must not on any acct. reply to me until it is perfectly convenient. Surely you were observing Fumariaceæ some time ago. Now I wonder however if (the flower of Fumarae.) can be fertilized by foreign pollen. By other than the pollen of its own stamens. Many other plants might be named in same cate<gory>

[DIAG HERE]

<    > common one & I saw a few days ago that the insects had bored a hole at x thus getting at the nectar without disturbing the anthers which instead fit very closely under the stigma x x x

They wished me to notice your case of Primula dimorphism in Nat. Hist. Review & I thought of giving a short acct. of some cases of the phenomenon so far as we know anything abt. it,—as in Viola, Oxalis, &c.— And the case of such plants as the Corydalis, &c. occurred to me apropos of the thing.— I was showing Dr. Hooker & Mr. Lubbock the 2 forms of Primrose the other day which confirmed the admirable accuracy of yr. obs. upon them   Besides the differences in pollen, stigma, &c.—you might notice (perhaps indeed you say so, but I do not recollect it) that the ovules of the long-styled are considerably larger (& probly. less numerous) in the bud than in the short-styled plant even when expanded.—

I have made within the last few days a rather interesting obs. on dimorphous Campanula. I wished to allude to the case of the order (mentioned by Hooker & Thomson. Journ. Linn Soc. ii. p. 7 & previously by Linnæus in Praelectiones (of C. perfoliata))—& examined some of the smaller flowers. I find them thus,—

[DIAG HERE] No Corolla, no

apparent stamens

No—style or stigma,—but with ovary & numerous

ovules.

x is a hairy mammilla sticking slightly up in middle of disk   Dissecting further I found the disc membrane double in the middle the interspace enclosing a stigma-like body:—thus—

[DIAG HERE]

In the minute flowers,—(size of coriandras to pea), it was at first difficult to understand, but I now find that the stigma-like body enclosed by imperforate membrane—is both stigma & anthers. Looking down upon it after dissecting away upper membrane I find it, in the large flowers 5-lobed—with slender rays from the tips of the lobes to base of each calyx-lobe thus—

[DIAG HERE]

the ends of the rays are attached.— Further examining & comparison shows satisfly. that there are stamens closely connate over a stigmatic body. In flowers of larger size,—approaching normal conditions—I find the stigma raised in short style (it is rather long normally) & the membrane (which represents the corolla) ruptured—or rather not closed over it.— Now I have not means at hand to ascertain certainly just now but do not doubt but that the small flowers do perfect seed, tho' the `flowering' takes place (one wd. think) where `crossing' was out of the question. I thought of giving a little drawing or two of it to Linn: Soc. as I can make time before my lectures,—calling attention to it.—

By the way I think I cd. get you some Primula farinosa this season if it wd. be useful to you.— If you wd. care in the least for it,—if you'd kindly spare me a duplicate of your Primula paper I wd. lend it to a person (whom I do not know personally) living very near heaps of the plant, & dont doubt he wd. try to send a box.—

Yours very Sincerely | Dl. Oliver

    Footnotes Add

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    f1 3502.f1
    CD had been unwell following his recent trip to London to read a paper before the Linnean Society (see letter to J. D. Hooker, 9 [April 1862] and n. 5).
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    f2 3502.f2
    CD and Oliver had corresponded the previous year about the pollination mechanisms of Fumariaceae (see Correspondence vol. 9, letter to Daniel Oliver, 9 April [1861]).
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    f3 3502.f3
    [Oliver] 1862c. CD made several annotations on the review in his copy of this issue of the Natural History Review, which is preserved in the Darwin Library--CUL.
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    f4 3502.f4
    Oliver refers to Joseph Dalton Hooker and John Lubbock. CD read his paper, `Dimorphic condition in Primula' before the Linnean Society of London on 21 November 1861 (see Correspondence vol. 9).
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    f5 3502.f5
    CD's paper does not describe differences in the size of the ovules of the long- and short-styled forms of Primula, but CD included Oliver's observations on this point when he revised the paper for inclusion in Forms of flowers (see Forms of flowers, p. 17). See also letter to Daniel Oliver, 12 [April 1862].
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    f6 3502.f6
    Hooker and Thomson 1858.
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    f7 3502.f7
    Linnaeus 1792.
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    f8 3502.f8
    In addition to his duties at the Royal Botanic Gardens, Kew, Oliver was professor of botany at University College London.
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    f9 3502.f9
    The person to whom Oliver refers has not been identified; Primula farinosa, the bird's-eye primrose, is common in damp woods in northern England and southern Scotland. CD had requested specimens of this species from Oliver the previous season, but Oliver had been unable to send any (see Correspondence vol. 9, letters to Daniel Oliver, 1 May [1861], 27 May [1861], and 11 September [1861]).
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    f10 3502.f10
    See letter to Daniel Oliver, 12 [April 1862] and n. 4.
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    f11 3502.f11
    See letter to Daniel Oliver, 12 [April 1862].
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