Front Page Titles (by Subject) Cnicus Forsteri SEPTEMBER 1841 - The Collected Works of John Stuart Mill, Volume XXXI - Miscellaneous Writings
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Cnicus Forsteri SEPTEMBER 1841 - John Stuart Mill, The Collected Works of John Stuart Mill, Volume XXXI - Miscellaneous Writings 
The Collected Works of John Stuart Mill, Volume XXXI - Miscellaneous Writings, ed. John M. Robson (Toronto: University of Toronto Press, London: Routledge and Kegan Paul, 1989).
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Phytologist, I (Sept. 1841), 61. No. 21 in Art. XXIII, “Varieties; Original and Select,” Signed “J.S. Mill; Kensington, July 13, 1841.” Not republished. For the identification in Mill’s bibliography, see “Rare Plants in West Surrey” above.
cnicus forsteri I saw growing by hundreds last month in a piece of marshy ground formerly part of Ditton Common; at least it was the plant I previously found near Weybridge and sent to Sir W. Hooker.1 It was growing with various numbers of flowers from one up to four, each on a separate and generally a long stalk. On comparing it with the books both English and foreign, and especially with Decandolle’s description of his Cirsium anglicum2 (our Cnicus pratensis), I have little doubt that it is merely a variety of that, and that C. Forsteri, as you suggested, has no existence as a species.
[1 ]William Jackson Hooker (1785-1865), one of Britain’s leading botanists, and Director of Kew Gardens.
[2 ]Augustin Pyrame de Candolle (1778-1841), Swiss botanist whose influential “natural” system of botanical classification is given in detail in the work Mill refers to: Prodromus systematis naturalis regni vegetabilis, sive enumeratio contracta ordinum generum specierumque plantarum huc usque cognitarum, juxta methodi naturalis normas digesta, 19 vols. (Paris: Treuttel and Würtz, et al., 1824-72), Vols. I-VII having appeared by the time Mill was writing. The reference is to Vol. VI, p. 650.