RECORD: Darwin, C. R. 1858.05.16. I suspect good generalisation. CUL-DAR49.50. 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.


[50]

May 16/58/

I suspect good generalisation, that wherever there is nectary on one point alone of circle of corolla, pistil, (if it bends.) bends or at least stigmatic end towards that point. Leguminosae. Fraxinella, Fumaria

How in Melampyrum? Digitalis, Anthurium &c

See to this in all flowers.

In Polygala stigma path are rectangle to any point, where Bees could enter corolla & I know Bees do without it.

gladiolus (orange) must hang on lower side of flower, not off base, but when filaments attached, pistil when mature bends down to the side.

Rhododendron obeys law

viola tricolor.

Horse chesnut

Delphinium grandiflora at in passage to nectary

[50v]

In the greenhouse Balsam, there is spur-nectary on lower side of flower, & anther and pistil bend downward into gangway.

Tropæolum canariense, when pollen shed & stigma probably ready, the whole pistil is always slightly bent up to gangway.


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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 25 September, 2022