RECORD: Darwin, C. R. [1874?].09.22-11.06. U. Montana. CUL-DAR59.1.137-139. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 10.2022. 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 54-61 contain material for Darwin's book Insectivorous plants (1875).

Utricularia is a genus of carnivorous plants known as bladderworts. These notes are for Darwin, C. R. 1875. Insectivorous plants. London: John Murray. (F1217)

"The social breadth of the network that Darwin drew on in his work on insectivorous plants was remarkable. The aristocratic horticulturist Dorothy Nevill hugely admired Darwin and was always eager to help by sending specimens from her well-stocked garden. ...[She] supplied Darwin with a specimen of Utricularia montana to work on. At first, Darwin mistook the empty stem tubers for bladders; when he found that the real bladders, which were very small and transparent and on the roots, captured prey, he exclaimed: 'I have hardly ever enjoyed a day more in my life than this day's work' (letter to D. F. Nevill, 18 September [1874]). Francis's new wife, Amy, drew the plant (letter to Francis Darwin, [17 September 1874])…Utricularia montana is an epiphytic species of bladderwort, native to the Antilles and northern South America. [It] is a synonym of U. alpina." Correspondence vol. 22, pp. xxviii, 447.


[137]

U. montana

well watered on Sept 22d.}

Sept. 24' 8° A.m Bladders Tubers measured} I can see 5 Tubers

1 Pin Green

(Oct 16th 8 AM. ⊙ ⊙ ⊙ ⊙ much wrinkled)

(Oct 27' long ⊙ ⊙ ⊙ ⊙ Broad Thick ⊙ ⊙ Surface much shrivelled Rhizome to which attached dead & separated from Rhizome was cylindrical green)

long ⊙ ⊙ ⊙ ⊙ — Broad

(⊙ ⊙ ⊙ ⊙ Oct 8th. 8° A.m very green surface rather irregular)

à (Oct 27th all four leaves green but slightly curved curved backward & very slightly & shrivelled, but feel soft)

2 Pins (Oct 16th ⊙ ⊙ ⊙ ⊙ quite smooth)

(Oct. 27th Long ⊙ ⊙ ⊙ ⊙  Broad Thick—⊙ ⊙ green much shrivelled soft — very [illeg] & much flattened still attached to Rhizm

long ⊙ ⊙ ⊙ ⊙ Broad

(⊙ ⊙ ⊙ Oct 8th 8° Am very green rather wrinkled Earth seems as dry as dust in all upper part.)

Bent Pin ⊙ ⊙ ⊙ ⊙

(Leaves quite green Oct 8th Brown Rhizome brown withered still attached to rhizome, as flat as thinnest dry leaf; but as seems to have been upturned may have been injured— There seems 2 sorts of tissue— something odd about it. This third rhizome must have died from accident)

Pot 4 1/2 by 4 1/2 outside measure kept in Hot-House no Bell-glass & never a drop of water

(over)

[137v]

(Mem. before these observations were begun one bladder cut off another very large one, rotted from accident & many rhizome cut off.— also one since experiment began decayed perhaps from accident.)

Oct 28' 7° 30' The fragment of tuber which was put in water after slices cut away yesterday at 9° are now constantly swollen & smooth externally & tense — what an attraction for water!! but the dea the one spe separated from rhizome & of a green colour & which I believe was dead owing to death of rhizome has not swollen in the least—

Nov. 3d. Leaves of plant, which was replanted on Oct 27th now dead & whole plant dead & Tubers all rotten. —

(Dug up on 6th) Utricularia Montana

[138]

Oct 27' In long & transverse section of tuber — no great difference to what when fresh before. — surface wet when cut — papillæ on exterior surface not shrunk. (This was the best tuber & attached tube to rhizome, marked by 2 pins) No., there is this difference that walls of cells now not nearly so straight & from outline of cells less distinctly angular. It is clear that they have contracted.

(I have turned plant out of Pot— soil as dry as turnpike road — I found 4 subterranean tubers all in the same state as above, shrivelled & flat as above.; 3 green & 1 white. —

[in margin:] (House rather hot)

I marked them with white Thread & planted the plant again & kept very damp. Oct 27th 9° 30' Am

N. B. With respect to plant having kept pretty well from Sept. 22d. when watered till this day it must be remembered 2 tubers were cut away & 2 died from injury & that several rhizomes were cut off for examination & soil deeply disturbed for this purpose — Otherwise plant wd have kept longer fresh.

[in margin:] 35 days!!

[139]

1 Pin Oct 27 1/6 shorter

but 1/2 & 1/3 less broad

.31 of an inch 6.2 broad at first

6.2/20 = 3.1/10 =.31.23 —.46 broad

.13 —.25 thick

2 Pins 1/11' shorter

1/8 less broad

but the transverse slice

6 [illeg] broad

.52 do

.3


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

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