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Darwin Correspondence Project

From H. C. Watson   14 June [1857]1

My dear Sir

Looking for something else, I stumbled on the passage extracted on preceding page. It seems to meet a query you some time ago addressed to me respecting the Limosella & Subularia, to which I was able to reply from personal observation only in respect to the former.—2

Very truly | Hewett C. Watson Thames Ditton June 14th

To C. Darwin | Esqe


9th. February 1843

Professor Graham read an account of a Botl. Excursion in Ross-shire during August, 1842.3

The party left Edinburgh on 21st. August, &c - - - - -

“The season having been remarkably dry, all the lakes were far below their usual level, & in consequence such plants as Lobelia Dortmanna, Subularia aquatica, &c. were seen in flower and fruit on dry ground”— Trans. Bot. Soc. Edinb. vol. 1, p. 201.4


Dated by the reference to Watson’s previous letter on Limosella and Subularia (see n. 2, below).
Robert Graham was professor of botany at Edinburgh University, 1820–45.
This information was not used by CD in his discussion of the possible cross-fertilisation of water plants (Natural selection, pp. 62–3).


Natural selection: Charles Darwin’s Natural selection: being the second part of his big species book written from 1856 to 1858. Edited by R. C. Stauffer. Cambridge: Cambridge University Press. 1975.


Sends a reference to Subularia which bears on a query CD made some time ago [see 2002]. Subularia was seen to flower in the air in a remarkably dry season.

Letter details

Letter no.
Hewett Cottrell Watson
Charles Robert Darwin
Sent from
Thames Ditton
Source of text
DAR 207: 20
Physical description

Please cite as

Darwin Correspondence Project, “Letter no. 2106,” accessed on 28 September 2021,

Also published in The Correspondence of Charles Darwin, vol. 6