RECORD: Darwin, C. R. 1842.06.07. Crucianella stylosa / Elizabeth W / Dichogam. CUL-DAR76.A5-A6. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 12.2022. 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 76-79 contain material for Darwin's book Cross and self fertilisation (1876).


[5]

Maer June 7th /42/ (Ch 3) " Crucianella stylosa " Elizabeth. W. (Dichogam).... (dried) pistils very long.— (??)

Simple case of dichogamy

After several hot days on pricking full buds division of corolla burst open & pistil sprung out to a considerable height & immediately continued quickly to extend to almost its usual normal length — in other buds opened naturally then does not seem to be this spiny, but merely rapid growth extension. style lies curved in tube of corolla:

Stigma club-shaped. rugosa. externally mouth of corolla narrow, with anthers resting on it— pollen shed before flower opens — & is carried out adhering to stigma. — pollen minute, & pretty plentiful & easily blown by wind— stigma double rugosa, not very large, smaller but like Mercurialis perennis. — in full opened flowers all pollen shed & stigma externally clean.

In pistil on first opening, has its stigmas

[6]

closed it opens some little time before they open & are seen to be humid.— by that time pollen seemed entirely removed by movement of long slender style. —(like a grass). — curious replacement for Lobelia & Compositæ — rugosa knobbed stigma, instead of brush.= at narrow corolla instead of united anthers = & crooked style, instead of slow growth of whole pistil wh. seems case in Lobelia.—

I find style is zig zag in corolla & slowly straightens by elasticity. — cannot see anyothercases of stigma springing out, but certainly exclusion rigid.—


Return to homepage

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

File last updated 1 June, 2023