The Complete Work of Charles Darwin Online

RECORD: Darwin, C. R. & Francis Darwin. 1874.07.08 Pinguicula lusitanica. CUL-DAR59.1.80. 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)

[80]

Pinguicula lusitanica

July 8. 74 (7)

Put several pieces of the flower stalk into a solution of Carb: Ammia. {gr 2 to [symbol] i} for nearly an hour —

The glands have changed in colour from a transparent or bright pinky-purple to a dull blue-purple— No marked aggregation— Raid circuln of very minute spheres in the footstalks of the glands—

After 8hrs 1/2 immersion in same solution the colour is discharged from the glands—

In structure the glands appear identical with the ones on the leaves—

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