RECORD: Darwin, C. R. 1874.07.03-08. Pinguicula lusitanica. CUL-DAR59.1.74-76. 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).

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


[74]

July 3d. 74 Pinguicula Lusitania — Mr Ralfs of Penzance sent one pulled up. — (Catch many insects which were chiefly lying under much involuted edges— also leaf of E. tetralix & flower of Galium & scales of grasses or Carex.—) (In flower)

Young leaves with lat. margins much more involuted than those of P. vulgaris; so were old leaves, the edges are rolled over a 1/3 or 1/4 of distance to midrib.— whether naturally so when growing & when insects not caught I know not; but I think so— If so movements worth investigating.

On surface of leaf, numerus glands of 2 height & of nearly same structure & different size as in P. v. but of fine purple colour, as are the fibro-vascular bundles — The smaller glands extend to very near extreme margin. — (Where fly had lain glass (glands) all brown, all or very pale purple & granular (with coarse) contents.)— The perfect glands are filled with more fine purple granular matter than in P. vulgaris & thus differ from the transparent greenish glands of P. vulgaris

[74v]

(The space destitute of glands is rat broader toward base of leaf than towards apex)

[75v]

Wd Cabbage seed or Spinach leaf excite it? glass— bits of meat insect

Soaked cabbage seed bits of Spinach leaf

Do the involuted edges over the albumen uncurl? important as explaining great involution.

July 8th

(The multicellular stiff spines rising on each side of midrib— cross as if to protect it— Can these spines & those on middle parts serve to drive insect towards margin where sticky glands are.—)

[76]

young leaf

[sketch] hair

[sketch] gland

Ru P. lusitanica

 


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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 3 November, 2022