The Complete Work of Charles Darwin Online

RECORD: Darwin, C. R. 1863.08.24. Isotoma. CUL-DAR49.100. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 1.2022. 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 volume CUL-DAR49 contains notes for Natural selection chap. 3 on 'On...organic beings occasionally crossing' or dichogamy.

[100]

Aug. 24 Isotoma

1863

The united anthers are bent & open towards gangway - They rest against back of corolla so cannot be pushed back as in Lobelia; but in conjunction the lower edge of axilia of anther is provided with long then rigid trigger-like Projector, which insect must push in nectary, & at right period when stem is down a flint of pollen is forced out.- Stigma protrudes & opens afterward- Swarm with thrips & is perhaps thus fertilised.-

Dichogamy

[100v]

[illeg] size of young, is [illeg] to other young – The [illeg] of whole Le Coult – Sweet Peas.

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