RECORD: Darwin, C. R. 1868.10.05-11. Vandellia nummularifolia. CUL-DAR111.A25-A26. 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 volumes CUL-DAR108-111 contain material for Darwin's book Forms of flowers (1877).


[25]

Oct 5. 1868 Vandellia nummularifolia

Perfect flower earliest— Imperfect flowers at first, when fertile, excessively minute, about   long — When .13 of inch long they contain well-developed ovules.— at 5/100

The sepals as extend to end of closed & excessively delicate, almost colourless, corolla.— This, with the dried anther, as ovarium swells, are pushed upward & make little brown cup to seed-vessel.—

There are only 2 anthers (!), judging from one fresh & one withered cup flower.—

The filaments are united for whole length to corolla —

The 2 anther cells of each anther diverge much at lower end & are separated by connective tissue.

Judging by one old flower pollen-tubes protrude from anther-cells—

Anther-cell very small, in longer diameter barely 5/700 of an inch in length.— 2 or 3 measured.—

Stigma very delicate, apparently nearly a [illeg] soft globular head to ovarium.—

[in margin:] Form of stigma [illeg] flower & pollen-grain protrude of tube

[26]

Frank has found only 2 corolla — think stigma bilobed—

Flower 1/20'' of an inch in length past maturity

Oct 11 another flower past maturity not above 1/20' of an inch in length — certainly only 2 anthers —

Stigma consists of 2 larger semicircular flaps folded backwards — seated on very short style.—

Summit of corolla — which became brown, quite closed, whether edges completely connect, I will hardly venture to assert.

Does pollen protect from anther-cell—

size of Pollen-grain — number

shape of stigma

How very sham in perfect flower?


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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 6 May, 2023